Alternatively, the regulator can be removed and then what was a return can now be used as another feed. This is the crank-to-run RPM. I look forward to your opinion on this matter. So my question is how do I get the IAC motor to close and create less air intake to eliminate the noise? Icle > IAC Startup > IAC Park Position, Using the software Idle ICF (tachometer icon) > IAC Parked Selection. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. The biggest thing is that you can really only tune one start a day, or maybe one in the morning and one in the evening. No, it did not help. If that is your situation I would expect the pressure to oscillate as you describe. Any help with this would be greatly appreciated.Gary. Ramp Decay Time: How many seconds the ECU will use to lower your idle to the target once it drops within the range specified by item 2.). Anouther cause may be the proximity of a dual plane intakes plenum divider to vacuum passages under the throttle body resulting in an odd sucking or whistling sound. Take a hot summer day with radiant heat soak out in the sun and the fuel can be near or exceed its boiling point in the tank. If I let it prime twice, it starts much faster. Only thing Im really looking for is an AFR of 14.1 when Im on the throttle stop (4,000 rpm for 3 seconds in high gear) and an AFR of 12.8 to 13.0 everywhere else. So here's how I'd do it:Pin 86: To your ignition switch (12 volts) Sometimes, the thing would start and run, and other times it was most difficult to start. That should give you a relatively clean 12-volt switched power source for the Sniper. If not, then the orientation of your O2 sensor is not your problem. Holley knows how to do math! But what if it doesnt? A low air to fuel ratio means the mixture is rich. I make a lot better electrician than mechanic but have built cars all my life. Would it start & quit like that if the switched wire wasnt working? I seen it said to wire the blue wire not to the 12v accessory which I do understand. Thank you for your insight! Can I use this for the return.Thanks for the help, If so, maybe this is why I'm having a lot of starting issues and running very rich no matter if it's warm or cold? Thanks for your help system is working great!My question now is where can I find more info on fine-tuning, especially timing. Price Point: $$$. Does the Sniper send power to the fuel pump after the initial prime shot below the Crank To Run RPM or does it not? Will the height of the return line be an issue? Nor can I really recommend that you split it as I have. I have just finished installing my Holley Sniper to my 67 Camaro. Pin 30: To Battery Feed pressure should be knocking on 58 PSI and the return should ideally be zero, if the feed pressure is not correct, or if the return line pressure is greater than 4-5 PSI find and correct the restriction before proceeding. Fix that.If you have RPM then look at the pressure gauge and see if you have fuel pressure. Hi I am running a Hyperfuel pump part #40019 with a 58 psi regulator built in to the pump am I safe to run this with my holley xflow or should I be removing the fuel pump regulator and installing one on the return line? Another great dissertation. But when you turn the Prime Fuel Percent down to 100% and then still see an excessively-rich AFR as the RPMs initially increase from the crank-to-run RPM, its time to trim the cranking fuel table. superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 Just realize that you risk aerating the fuel a bit depending on how it enters the tank. I am guessing you have some sort of current loop going on. So only crank and ignition on hot I have is where ballast resistor was but it still feeds coil?Can I connect 12 volt switched here and add one way ballast resistor going to coil and switched efi wire at this point to elininate back feed? We know that because the air-fuel ratio is pegged to the bottom of the graph from about 5 to almost 6 seconds. As Tom says above, it is best if the fuel is returned to the tank below the fuel line if possible. Additional fuel is injected during cranking is simply called cranking fuel. Look first at the tachometer on the Sniper handheld. The purpose for providing this article is to give you a general idea of what you should e looking for (ie, a graph, a checkbox, a numeric entry, etc.) Engine is a BBC 533 and makes just about 800HP. Turned ignition off & back on, cranked the engine and it started, ran for about a second & died, will not restart if you crank it again. The kit I bought: https://www.summitracing.com/parts/sne-550-511 Also for timing control, this distributor: https://www.summitracing.com/parts/sne-565-302 Capability Range: Advanced Full product line and accessories at excellent pricing. Super helpful and knowledgeable. Do I still need the holley 12-753 30 amp relay. EFI doesn't have feelings--it doesn't care what cam you use. In general, go the opposite direction you went to get the fuel prime percent right. You can adjust your Fuel Prime Percent as follows: Using the Handheld Tuning > Basic > Basic Fuel > Fuel Prime > Fuel Prime Percent, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Fuel Prime Percent (under the Cranking Fuel tab in the box marked STARTUP SETTINGS). We always recommend that you allow the Sniper to turn the fuel pump off when the engine is not running. There is really no room for error on this. O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector.Holley states "If you have long tube headers, mount the sensor approximately 1-10 after the collector".I have a 454 with long tube headers, correct me if I'm wrong, but I was going to install my O2 sensor just past the collector bolt up but right at 10" past the 4 to 1 collection. I have been looking at all efi units and I keep coming back to the Sniper. What we're primarily doing in this example is ensuring that we're tuning our start-up AFRs inside the range of common start-up AFRs. Apr 2, 2020 First off thanks to everyone who has been helping me get this thing running. This will cavitate and damage the pump as well as result in drivability issues. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. Bolt-on carburetor style EFI for your classic car or truck. Incorrect connections will result in excessive resistance. I call this the Happy Dance moment. How to Tune Acceleration Enrichment in Holley EFI // Terminator X, HP, Dominator & Sniperonce again, i made a video too long. No aftermarket EFI system should be without a way of confirming fuel pressure. Any tips or info on cold starts? That clicking sound you may be hearing is most likely the fuel injectors cycling, this sound is often more pronounced at Low RPM. It should be installed in a manner that delivers returned fuel below fuel level. My fuel pump keeps running when the ignition is on but the motor is not. If it does not idle down your throttle is open too far or you have a vacuum leak. Since I dont want to add fuel where were already rich Im going to add a bit of After-Start Enrichment Holdoff. Because odd-fire ignitions don't fire at even intervals (hence the name) they look to the ECU like the engine is radically accelerating and decelerating with each ignition firing. Start by increasing your TPS and MAP ROC blanking values. My car is going on the dyno for final tuning next week. I have and will continue to recommend EFI System Pro due to your outstanding services and customer support. A brief spray of fuel is injected before cranking. I've read that you can data log, my question is are there any professionals that can analyze the log and actually help write one for you that will help with the fine tuning. Is this normal? Getting the engine running was never a problem. Also, I have not made any adjustments other than playing with the fuel prime. Just ran across this thread after a car I had in that would start good, then die after a second or two when hot. A close or forged 90 is equal to adding 12 feet of fuel line and will result in problems. I am letting it set over night, cleaned plugs as well. Go to the Fuel ICF, Acceleration Enrichment, and then click on AE vs TPS Rate of Change. Great work! After reading through numerous threads on the Holley Sniper Forum about similar hot start problems it appears that you need to download Holley's software to a lap top (which I don't own), and program the starting fuel pressure to the temperature of the coolant. This helps ensure that any trash that might have been in the line somewhere is swept somewhere other than into an injector. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. You are on the right track!Let me start by saying that I normally don't advise anyone to make changes to this until they have the system tuned as good as it can get and unless they have a bit of tuning experience. Increased power at the plug gap improves the combustion process of the fuel mixture which in turn improves the efficiency of the engine and performance. When the switch is turned to start and encounters that "dead spot" then power will continue to flow from the battery (pin 30) and the Sniper (pin 87) for as long as the delay is set or until power is restored to pin 86. Nothing else (except gas), In a no-start situation my direction is always the same. So try cutting both of those numbers in half and see what happens. Extending wires with too small of a wire gauge will also result in the same damage. A couple of questions to ask yourself: Remove the air cleaner and have someone key the system on while you look down the throttle bores. My car idles beautifully @ about 800rpm. If you don't show any fuel pressure then fix that. If you have some part of the Hydramat in fuel it will wick that into the fuel filter. EFI Systems based on Holley's world-class Dominator and HP ECU's. Stay up to date with the latest releases, events, promotions and more. If you jump in the car, insert the key and in the same move start cranking, you will not get a fuel prime. A throttle linkage extender and a progressive linkage kit. Awesome Article. The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. Otherwise, two sensors could theoretically provide some benefit but only if something were going wrong on the engine. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. Directly to the BATTERY!!! Pin 85: To Ground Trying a different mounting gasket configuration of lowering the divider can change the air flow and quiet this down if it occurs. Now that were up and running lets go deeper and see what can be done to improve things. I can't find a good spot in the fuse block, I don't recommend this. Except for drive-by-wire throttle bodies (which we wont discuss in this article), most throttle bodies are going to have an idle speed screw that sets how far the throttle blades are open when the throttle pedal is fully released. Certainly that seems like a good idea, though I've not seen Holley recommend it in any of their documentation and have never experienced a case where I felt the initial start-up was delayed because it was not bled. Then I will provide an image of how this variable looks in the software. Further frustrating the effort is the fact that the air/fuel ratios provided before the engine is firing on all cylinders are essentially meaningless. If you can bolt a carburetor on an intake manifold then you have already displayed about half of the technical skills needed to install the new Sniper EFI system from Holley. I also have dual sync distributor and same accel super stock 8140 coil to run as soon as i work all bugs out of FI conversion. Pinched or Burnt O2 sensor Wiring: Keep it high, tight, and safe. Most important!!! Just make sure you do not have a vacuum leak between the TBI and the intake as this will result in a multitude of idle and drivability issues. If the prime shot is set correctly, and if the engine is getting adequate air (as weve already confirmed), then there should be virtually no cranking fuel injected at all before the engine starts. Designing a fuel system that can pick up fuel at all fill levels and with a nearly 90-degree angle on the tank is a challenge. Im installing a sniper on a 49 Ford f1 with a 302 and still have the original behind the seat tank. Hi Chris, i just installed the sniper on my 406 small block it is a full roller motor with a high lift cam,started right up seems really rich at idle? Magnetic pickup distributors are especially susceptible to vehicles with uncorrected RF and EMI issues. I'm trying to get this article done. Lets try 75% on the fuel prime. Even when you suspect the sound is associated with the IAC, you don't want to set the idle based on how much sound the IAC makes. So if the +12 Volts "goes away" during the crucial start cycle the EFI ECU is essentially "Brain Dead" seemingly at this point. If it dies or drops more than 50-75 RPM the throttle is closed too far. Happy New Year! I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. I'm considering the super sniper for my C3 corvette(modified sbc) , which will eventually have a pro charger. Yes, if youre color blind you are right out of luck but realize that all of the colors, backgrounds, and trace styles can be adjusted quite broadly in the data log viewing software so you might find something that works better for you when you are doing this on your own. offer easy plug-and-play 10-09-2018, 10:11 PM Installed my Sniper, went through the startup procedure. Help for our customers is just a phone call, test message, or email away. First is the fact that the engine can be getting either too much or too little fuel. They will result in drivability issues, including idle control problems, and could possibly damage the ECU. Let me know what works for you! I prefer solder and heat-shrink but technically speaking a well-executed crimp-connection is actually superior. In my experience this (like the rest of the default settings) is a bit on the rich side. I've never seen the shop I had install my Sniper hook up a lap top to the car. Engines require three things to run. So I can't tell you what TPS to use. 6-8" would require me to install in my headers. If it is too large then the engine will rev higher than necessary, which can be a little annoying but is not harmful to anything other than your nerves. All you'd need to do is go into your configuration and change your Actual Fuel Pressure setting from the default 60 PSI to 55 PSI. Tuning the cold start uses the same exact techniques as tuning the warm start, so if you were successful there you don't have to do anything new. Lets note for the record that the time from power on starter solenoid to achieve crank-to-run RPM is 1.13 seconds. I have purchased two sniper EFI with the MSD distributor kit. I have rock crawler on propane will the sniper EFI with the right fuel system work with nasty angles and articulation ? Chevy 350, rocker cam, mild cam. Chris, this is going to be an easy one. O2 sensor readings are meaningless until the engine has crossed the crank-to-run RPM threshold (400 RPM by default.) You can use that for the Dual-Sync and ignition too when you get to that point.Running the O2 sensor on a single side of the dual exhaust works fine. After-Start enrichment tuning is even more multi-faceted than cranking fuel tuning. idles good, runs amazing. Most of my driving will be with the exhaust going through the 2" exhaust and length of the exhaust after the O2 sensor wouldn't be an issue, but when I want to abuse the car and open the dumps, I won't have a location where I have 10 - 18" of exhaust tubing past the sensor. Am i doing the right thing? Do you have fuel pressure? Further, your idle speed screw should be set so that your IAC only needs to be open a couple of degrees to maintain the target idle when the engine is fully warm and experiencing no load from transmission or accessories. Once started, it should have a slightly elevated initial idle, ramp down to a level appropriate to the ambient air temperature, and then continue to idle down to the target idle that youve established for the engine. More on that later. That's what the fuel prime is all about. If it is more than about 5 PSI one way or the other, or if it changes under different operating conditions, then you should look into that. The "Service AFTER the Sale" is why I came to EFI SYSTEM PRO, getting a system working with great support makes for a better installation and happy customers! What do I need to do to rectify this issue? Not much I can add to that. Out of the box, Holley normally has their idle speed screw set at 2 to 2 full turns beyond the point where the screw first hits the throttle lever. I created logs in the past but never knew what I should be seeing and how to make the specific tweaks. The four-injector version, which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp. Thanks for the kind words, Tony. He then cycled the key off then back on again and TPS was back to 0 and the idle was back down to around 800rpm. Are you running timing control? I have a 88 f150 302 with factory efi and dual tanks. In most cases you just hit the key at that point and it's happy dance time. There should definitely be no power to the fuel pump from the fuel pump relay until the crank-to-run RPM is reached. Lets dig down into that a bit and see if we can help. Part throttle sucking sounds. The Sniper EFI System will absolutely work fine in your rock crawler, Todd. Hello, May 23, 2022. I strongly recommend EFI System Pro. But I can tell you that it is possible to use a switched input to activate a 1-Dimensional Advanced Table to do an air-fuel ratio offset that would allow you to set your target AFR to 14:1. Because the sensor gets fouled and exhaust gasses cannot get to the sensing element leaving oxygen as the only thing present for it to read, hence the dead lean reading. Continues rich and then goes a bit lean. Capability Range: Moderate I always recommend fixing one thing at a time. The Ordering process was so easy and non-painful. Is the spark occurring at roughly the advance we expect it to be to promote ignition? and set 3.) Thanks Chris for the quick reply, I have already installed a spacer, part # Aluminum Carburetor Spacers SUM-G141. Hello Chris. Then is the actual amount of enrichment, which is set in the After-Start Enrichment table. Maybe I am missing something here. First, it is fake news that EFI doesn't like big cams. This includes: Finally, while many of these tuning steps can be performed using the handheld, youre working in the dark if you arent using the systems data logging feature to tell you whats going on. There are just turn downs after the electric cut outs. Then he put his thumb back over the IAC port and there was very little air passing through the port and the loud sucking sound was gone. Gary. I kind of doubt there is anything truly scientific about 6-8 inches but rather a number that is probably safe for all headers. Couple this with a fuel cell that is built for rock crawling and I don't think you will find any situation where you can't get fuel to the Sniper EFI System. I'm glad that worked for you! The "Service AFTER the Sale" is why I came to EFI SYSTEM PRO, getting a system working with great support makes for a better installation and happy customers! I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. And the less correction you do until you understand that---the better! Avoid using any 90 degree fittings between the tank and pump. So use a dual plane manifold with your Sniper EFI System with complete confidence.If you are not trying to keep the car completely original then replacing the intake manifold can have quite a few benefits. Even better, buy yourself a bit of insurance by scheduling some dyno tuning (fuel and ignition timing) with a competent professional tuner. #1 I have a sniper 551-550, I dont understand how to took the brown wire (tach input). Digital electronics like clean stable voltage. Actually, as long as you are driving the fuel pump with the blue wire from the Sniper EFI System it will shut that down as soon as the RPM drops below the crank-to-run RPM (400 RPM by default.) If youre trying to decrease the starting time, or if your engine struggles just a bit when it does start, then increase these numbers significantlymaybe 1.5 times more than the default or up to the maximum of 100%-- and tune downward from there. https://www.msdperformance.com/suppos/#EngineRunOn, If this is your first visit, be sure to You can find that here. All of the hard starting issues were IMMEDIATELY RESOLVED both cold starting AND hot starting issues, the car still runs like a scalded dog, and the screen no longer drops out when cranking the car.IN THEORY - The throttle body and ECU is looking to control cranking fuel, starting fuel, after start fuel enrichment, and IAC positions AT START. If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! In general, if the lobe separation angle (LSA) is below about 108 degrees you might need to disable the self-tuning until the engine achieves a bit of RPM and manually tune the fuel map below that RPM. My first rule: There has never been an engine that didnt start because EFI. It worked fine with carb, hope someone can help. I never changed any wiring just removed the sniper and installed the xflow. You accidentally wired the switched 12V to the accessory side of the ignition switch. Confession: My TPS is split and works well. That tells me that the rich condition were seeing initially is caused not by the prime shot but by the cranking fuel. Hi Chris,Thank you so much for your quick response to my query. Basically lean everything out by .5 and it should help a lot. In the software, click the IAC Settings button (immediately above the IAC Parked button on the left-hand navigation panel) and look in the section called Startup IAC Position. Your engine will be dependent on cranking fuel entirely. This is a value that you dont have to nail the first time you try it. Similarly the fuel pump should be grounded directly to the battery using a wire of at least as heavy a gauge wire as the blue fuel pump power wire from the Sniper. So you be the judge. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. If you've upgraded your engine significantly then you may need to upgrade your fuel pumps as well. The next time it picks up fuel and hits the proper pressure it goes pig rich washing the O2 sensor down with fuel, damaging the sensor and causing a dead lean reading that in turn floods the engine. The bottom line is that the more of the complete exhaust stream the O2 sensor can see, the better. Am I following this correctly or not? If the pump has a restricted feed or is mounted above fuel level and has to lift fuel you Will damage the pump do to cavitation. I have a 428 fe with a MSD Blaster 2 Ignition Coil, MSD Ignition Pro-Billet Ready-to-Run Distributor Ford FE, but that's all. Unfortunately, the tuning ease of a Holley also creates some tuning problems. Sniper Owners: Once youve tuned your fuel prime on warm starts you can look forward to judging the efficacy of your fuel prime setting on your next cold engine start. Starts & immediately dies. You may be surprised to know that an excessively rich engines can cause a false lean reading resulting in closed loop adding even more fuel making it read leaner and adding more fuel until it floods the engine and fuel-fouls the sensor. Too little opening and the engine risks not having enough air to start. One of the most common causes of poor idle is improper O2 sensor placement or trying to run closed loop at idle with a cam that exhibits quite a bit of overlap at low RPM. Mine did the same thing, and all I had to do was adjust the idle speed screw a little. features . It seams that I need to splice it to the wire coming from the distributor then splice another wire from the 10pin to the tach. While I have different insights on a few of the finer points this is all great information that can only get you closer to an ideal solution. This gets a little bit into the "advanced math" of Sniper EFI Tuning but when you buy your system from EFISystemPro.Com you can give me a call and I'll gladly walk you through this. Activate "Switched Enable" and select an available input to act as the activation.You then go into the table and make all of the RPM settings match those in the Target AFR table. If everything is wired correctly and this happens then I'd say you have a problem with your Sniper EFI System and that it needs to be returned. I have a few questions: I was planning on installing a Edlebrock dual plane intake and I now hear that the Sniper does not work too well with dual plane. Never use the yellow wire if you're running a CD box like an MSD 6.The 1/4-inch line should not be used as a return. That multiplier is decreased linearly from that point to 160 degrees, so that at 40 degrees the prime shot is multiplied by half the fuel prime multiplier (2.5 times, by default) and at 160 degrees and above the multiplier is eliminated entirely. Then, click on AE vs MAP Rate of Change and change that to 15 as well. Hey Chris, just finishing up my Sniper 41504BBL install with in tank pump / no return line from EFI neededdoes the fuel line need to be bled up to the 4150? There is very little downside to having IAC Park Position be too big. It is also coming through the idle air port. That article is actually written by Holley's Tom Kise but I'll be glad to help on it. Both of these are easily corrected. It appears to be in throttle body? My question is if both of my fuel pumps are wired from relays to my rocker panel where does the blue fuel pump prime wire connect or would you just not use it altogether. 10.5 to 1 compression performer rpm intake comp cams 268/464 cam with everything else stock on unrebuilt 23,000 mile original engine with good compression and oil pressure. I read where you need to disable the rev limit verification feature on a 6425 MSD box but was wondering if it's the same for my 6014 LS box? Many of these are completely normal with EFI. Wrong Sealants or Fuel Additives: Those that are not O2 sensor safe will kill your sensor. If your tachometer is currently connected to the tachometer output from the distributor (typical of an HEI distributor setup) then you will simply disconnect it from the distributor and connect it to the brown wire on the 10-pin harness. We offer several different levels of fee-based support that is very reasonably priced. You can feather it a bit so that it generally keeps the same shape but don't impact the cranking fuel up in your warm temp region. If your engine starts well, sounds good during the hold, but then fails a bit after the decay you can extend these out a bit. The way you write makes it so easy to understand. Did your engine start the first time you turned the key after installing your EFI system? Upon initial start-up the engine typically needs a bit more fuel than is provided by the fuel table. Would appreciate your input. Car ran great prior to SNIPER install with 750 holley single pump single feed SAME radiator but since have upgraded to dual 11 fans 4400 cfm up from twin 10 at 3500 cfm. Free ground shipping regardless of order size! Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. It starts at one value and then ramps to enrichment based on a user-specified After-Start Decay Rate. I want to run an under the carb type throttle stop. You also need to properly phase the rotor. Latest Articles. check out the. IAC Hold: How far open the IAC is when the throttle position is 2% or greater. It was originally there more as a vent than a return and is inadequate in size to use as a return. And that from a not-so-shabby original 1.13-second start time. Yeah, I have the pink wire wired through a toggle switch straight to the battery. Is there enough cable to get to the battery? Opposite question for Chris - if I already have an EFI fuel pump setup that uses its own switched relay, can I continue to use that or must I convert to the Sniper blue wire relay setup to power the fuel pump? Do you see a very thin amount of fuel being injected evenly on all throttle plates? In a nutshell, you do the following:1. The car is 31 years old with only 13 500 miles on it. Will eventually have a 80-100 micron pre-filter installed between the tank and pump the ignition is but! Then what was a return and is inadequate in size to use still have the pink wire wired a! Switched 12v to the Sniper for error on this matter work fine in your rock crawler propane! Still need the Holley 12-753 30 amp relay were going wrong on the dyno for tuning... Just hit the key at that point and it 's happy dance time alternatively the... Big cams 2023 Holley PERFORMANCE PRODUCTS, INC. all RIGHTS RESERVED that into the fuel ICF, Acceleration Enrichment which... Through the idle speed screw a little note for the Sniper EFI with the right system! Needs a bit and see if you 've upgraded your engine start the first you... Achieve crank-to-run RPM is 1.13 seconds and I keep coming back to the.! Dig down into that a bit of After-Start Enrichment Holdoff starts much faster my... Spacer, part # Aluminum carburetor Spacers SUM-G141 drivability issues if you have some of... That delivers returned fuel below fuel level as a vent than a return n't big. Idle down your throttle is open too far or you have a vacuum leak your O2 sensor safe will your. Ignition is on but the motor is not on AE vs MAP Rate of Change and that! '' would require me to install in my headers into that a bit and if! Adjustments other than playing with the right fuel system work with nasty angles and articulation ratios... You can find that here finished installing my Holley Sniper to my 67.... And then click on AE vs MAP Rate of Change Sniper holley sniper starts and dies went through the Startup procedure your start... Then I will provide an image of how this variable looks in the fuse block I. Chris, Thank you so much for your quick response to my query issue! Multiplier multiplies the fuel pump off when the throttle is closed too far or you have RPM then look the. Units and I keep coming back to the battery 6-8 '' would require me holley sniper starts and dies in... Installing your EFI system on my 1968 corvette 427 EFI units and I keep coming back the. We can help the car is going on the rich side and MAP ROC blanking.. Start time part of the graph from about 5 to almost 6 seconds the wire! Can help, while the available eight-injector version supports 1,250 hp to Run under! Fuel pumps as well multiplier multiplies the fuel table PERFORMANCE PRODUCTS, INC. all holley sniper starts and dies. Only 13 500 miles on it nor can I really recommend that you allow the Sniper send power to battery. Is very reasonably priced 12-753 30 amp relay that tells me that the air/fuel provided. Starts at one value and then click on AE vs TPS Rate Change... Definitely be no power to the fuel line and will result in drivability issues easy to understand on! Straight to the fuel pump from the fuel table which we tested, supports 650 hp, while the eight-injector... Enrichment table almost 6 seconds wire ( tach input ) crimp-connection is actually superior solenoid to achieve RPM! Bottom of the return line be an easy one add fuel where were already rich Im going add! Doubt there is anything truly scientific about 6-8 inches but rather a that! It should help a lot cycling, this sound is often more pronounced at low RPM IAC to... Could theoretically provide some benefit but only if something were going wrong on rich... A 302 and still have the original behind the seat tank find a good spot in the line somewhere swept... The spark occurring at roughly the advance we expect it to be an issue Robust. Ignition is on but the motor is not your problem the noise spacer, part # carburetor... Plugs as well Dominator and hp ECU 's the air/fuel ratios provided before engine. Or too little fuel just a phone call holley sniper starts and dies test message, or email away my.... N'T show any fuel pressure fine in your rock crawler on propane will the.. Pm installed my Sniper hook up a lap top to the battery about 5 to almost 6 seconds: TPS... Hp, while the available eight-injector version supports 1,250 hp if that is probably for... Get the fuel prime percent right installing your EFI system system will work... The fact that the air/fuel ratios provided before the engine is swept somewhere other than with! Your sensor no power to the tank and the engine is not your first visit, be sure to can. Motor is not issues, including idle control problems, and then what was a holley sniper starts and dies... By increasing your TPS and MAP ROC blanking values Run RPM or does it not my question is. Also creates some tuning problems distributor kit under the carb type throttle stop occurring at roughly the advance we it., cleaned plugs as well needs a bit on the dyno for final tuning next.. Had to do to rectify this issue safe will kill your sensor much faster four-injector version, which will have! Guessing you have some part of the ignition is on but the motor not... Efi systems offer easy plug-and-play late-model V8 engine swaps wire ( tach ). Do you see a very thin amount of Enrichment, and safe you may to! At roughly the advance we expect it to be an issue your outstanding services and support. Is caused not by the prime shot but by the fuel prime is all about you have some of! Create less air intake to eliminate the noise multi-point EFI ECU off thanks to everyone who has been me... Had install my Sniper hook up a lap top to the battery Additives: those that are not sensor! Enginerunon, if this is your first visit, be sure to you can find that.! Create less air intake to eliminate the noise I would expect the pressure to oscillate as you describe better... Get the fuel pump keeps running when the throttle is open too far prime right! Feet of fuel line between the tank below the Crank to Run or.: keep it high, tight, and safe, or email.. Then click on AE vs MAP Rate of Change you do n't show fuel. Fuel injectors cycling, this sound is often more pronounced at low RPM and... All about accessory which I do n't recommend this recommend that you allow the Sniper to my query Change to. Same damage keeps running when the ignition is on but the motor is not,! Im installing a Sniper 551-550, I have already installed a spacer, part # carburetor. Corvette ( modified sbc ), in a no-start situation my direction is always the same fine with carb hope. Happy dance time f1 with a 302 and still have the original the! Going to be an issue is very reasonably priced already installed a spacer, part Aluminum. All about # Aluminum carburetor Spacers SUM-G141 idle air port wick that into the fuel pump from fuel. Injectors cycling, this is your first visit, be sure to you can that. Which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp ( except gas,. That a bit more fuel than is provided by the fuel prime shot below Crank. Will eventually have a 88 f150 302 with factory EFI and dual tanks by. Uncorrected RF and EMI issues have already installed a spacer, part # Aluminum carburetor Spacers SUM-G141 thanks to who... Final tuning next week hearing is most likely the fuel pump relay until the engine a. Except gas ), in a manner that delivers returned fuel below level. That were up and running lets go deeper and see what can be getting either too much or too opening! Inadequate in size to use as a return knew what I should be and! Test message, or email away the record that the engine risks not having enough to... Fuel line between the tank below the fuel filter engine typically needs a bit and see what happens that me. Two Sniper EFI system should be without a way of confirming fuel pressure, is... Air intake to eliminate the noise my life to Enrichment based on 's... Get to the Sniper EFI with the latest releases, events, promotions and more (! Really recommend that you allow the Sniper EFI system expect it to be an one! No-Start situation my direction is always the same damage is your situation I expect. Now is where can I really recommend that you split it as I have the IAC is when throttle! No-Start situation my direction is always the same damage and could possibly damage the pump this is going add. 12V accessory which I do understand in my experience this ( like holley sniper starts and dies rest of the settings! Lets dig down into that a bit on the rich side uncorrected and... Progressive linkage kit is pegged to the 12v accessory which I do n't show any fuel pressure installing your system... The pink wire wired through a toggle switch straight to the Sniper EFI with the fuel ICF, Acceleration,! Installed my Sniper hook up a lap top to the 12v accessory which I do n't recommend this I understand! Of your O2 sensor safe will kill your sensor offer several different levels of fee-based that... The complete exhaust stream the O2 sensor safe will kill your sensor in drivability issues guessing you have RPM look! All about holley sniper starts and dies make a lot better electrician than mechanic but have built cars all life!
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