You will still get a prime shot each time you key the system on but once you start cranking it will not deliver cranking fuel and should eventually clear itself of the flooded situation and fire. Assuming the engine does not have some defect, seeing four cylinders is completely adequate. Either way, What I recommend is running a switched power wire from that point to a relay and then using that to switch power directly from the battery to all of your sensitive electronics (Sniper, HyperSpark, etc.). The engine (running with the Sniper default Temperature and Startup Enrichment values) surged almost violently until it reached about 170 degrees and then smoothed out and ran like a charm (after some tuning). Awesome Article. So here's how I'd do it:Pin 86: To your ignition switch (12 volts) And the smell is just about gone. 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. Hi Chris, there seems to be some confusion out there about the Crank To Run RPM and fuel pump operation. I have checked my wiring and also had an auto electrician check it all out also. Yes, all warranty replacement and repair claims must be handled through the retailer from which you purchased the unit. Fuel must also be added to start the engine. It needs air-fuel blend (in appropriate ratio), compression, and spark (correctly timed). Now were getting there. Activate Advanced Tables2. While I unfortunately did not buy the Holley Sniper from EFI System Pro directly given my shop did so elsewhere prior to the install, I was still able to learn and benefit from EFI System Pro's adjustable progressive link, fuel gauge and a gasket setup. Then, realize that you have the ability to delay the point at which the enrichment starts by up to one second. The way you write makes it so easy to understand. Is the sniper compatible with my distributor? Since this is inadequate for starting the rest must come through the IAC port. In addition to allowing you to replace your gaskets and the potential performance benefits, the aftermarket manifold would allow you to install the Sniper's throttle body with no adapter. 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? Excessive Fuel (Top Cause): Most often caused by the system adding fuel due to false readings resulting from incorrect sensor placement, cylinder misfires, exhaust leaks, overly rich tunes. What I've read indicates this comes from the fuel pressure regulator and is often associated with systems that happen to have 90-degree fittings (though not always.) You may have an injector connector that has come loose.A final note that I can't emphasize enough. :-D. Just installed a 4500 sniper my fuel system maxes out @ 55 psi will that work or do I need new fuel pump ? MSD does not specify any particular spark plug for their ignition boxes. Your thoughts?In your opinion, should I keep the factory cast iron intake or should I replace it with a more efficient one. PIck a size that will not just lay flat inside your fuel cell but will actually run up the sides and back. Footage taken from Holley Carburetor Installation & Tuning DVD Winter Blowout Sale - Up To 86% Off . Being a throttle-body based injection system, it gets an adequate picture of the air/fuel mixture by seeing a blend of all of the exhaust ports on one side of the engine. Bill Tichenor. That article is actually written by Holley's Tom Kise but I'll be glad to help on it. Connect the crank and run wires together and all should be good. Advanced throttle body injection systems capable of transmission control and more. Im getting ready to instal a sniper master kit on a Ford There is certainly some conflicting information on O2 sensor installation. Then, reduce your after-start enrichment by about 10% in the temperature range where youre tuning. If there is anything you see here that needs clarification please post a question in the comments, below. In general, go the opposite direction you went to get the fuel prime percent right. This is a value that you dont have to nail the first time you try it. Then is the actual amount of enrichment, which is set in the After-Start Enrichment table. This is normally completely adequate. And you are in luck--I wrote an article on improving the timing control on the Sniper EFI System. If you install your Sniper EFI System and then find that you are experiencing that noise, then it is a fairly simple matter to order the gasket or spacer and slip it into place. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. I figured it would be minimal. Lets try 75% on the fuel prime. Don't let that get the best of you. 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. At startup the pump runs a few seconds, the ECU fires a prime shot of fuel, and sometimes the presure drops a bit in the process. If the engine starts but is extremely rough-running were still in the guessing stage because misfires are going to cause the AFR to read lean. I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. While it is true that, ultimately, all of the 12-volt switched power sources are connected at some point, distance is your friend. And you don't pay a dime more for that--everything is the same price as every other Holley vendor but you get the service you deserve when making a purchase like this. None of your configuration settings will change as a result of being disconnected from power for any amount of time. You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector. Only thing I have done since last Wednesday was add Holley EFI gauges. Apr 2, 2020 First off thanks to everyone who has been helping me get this thing running. Presumably 60 degrees is the temperature at which the prime shot multiplier is deployed at half of the indicated amount.). Did your engine start the first time you turned the key after installing your EFI system? 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! Sniper is an exclusively throttle-body based line so it made sense to include it. Looking at the 4500 sniper and I run Super Street 10.90. If you are going to be working on something that will require you to key the system on several times without starting the engine, you might want to consider removing the fuel pump relay found in the harness. From what I read it should not be installed vertically? A close or forged 90 is equal to adding 12 feet of fuel line and will result in problems. We know that because the air-fuel ratio is pegged to the bottom of the graph from about 5 to almost 6 seconds. 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. Start by going after the fuel prime shotthe amount of fuel injected into the engine before cranking begins. If you turn your key to run and the RPM on your tach sweeps you probably have an MSD 6425 digital 6AL or ready to run distributor with the 12V square wave tach output wire and you missed the part in the ignition system or distributors instruction manual that said you need to disable your ignition systems rev limit verification feature if you are running EFI. Where do I start looking for the solution? One option: You can add a hall effect crank trigger to your engine and set it up so that you're getting one pulse-per-fire at even intervals. Hi, I have a 1987 Firebird with 305 engine and Quadrajet carb. is setting themselves up for unnecessary frustration. Just recently installed the Xflow and my AFR is reading is 15 no matter what I do, engine is running ridiculously rich but the AFR is not changing at all is this an ECU problem or is there some things I can try doing before I pull it off and send it back to holley? Like I said my sniper unit is running just fine and the car has never run better. You mentioned its use in # 9 of the top 10 Sniper EFI installation tips. 1964 Chevy Nova, 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide Transmission. I have an '89 Jeep 4.2L with a Sniper 2300 2BBL on it. Then, after I reconnect everything I'll key the system on a time or two until I see a reasonable amount of fuel pressure on the fuel pressure gauge. My car is going on the dyno for final tuning next week. Make sure you are using proper wiring practices. Part throttle sucking sounds. I have and will continue to recommend EFI System Pro due to your outstanding services and customer support. Wrong Sealants or Fuel Additives: Those that are not O2 sensor safe will kill your sensor. Holley carburetors find their way onto countless vehicles, from race cars to hot rods to delivery trucks, and for good reason: They're the standard of performance, and without question some of the most popular and easily tunable carburetors available. In the example below, the IAC Park Position is at 50 percent at normal operating temperatures. 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? Would it start & quit like that if the switched wire wasnt working? Further frustrating the effort is the fact that the air/fuel ratios provided before the engine is firing on all cylinders are essentially meaningless. I was wondering if you could help out? idles good, runs amazing. I mean, after all, we already have a base fuel map that provides a baseline for the fuel required by the engine to operate at this RPM. When one "assumes" it is EFI because they have an EFI system, well, I don't need to finish that sentence, do I? Can I run the pink ignition wire to the coil positive? I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. So my question is how do I get the IAC motor to close and create less air intake to eliminate the noise? Correctly tuned, your EFI-equipped car should start within a few cylinder firings with no application of the throttle. Get this high enough that it is not limiting the ability of the engine to start, tune the other factors that enhance the engines ability to fire quickly, and then come back and trim this back so that it doesnt over-do the initial rev-up. I want to run an under the carb type throttle stop. Resistance results in heat and heat results in more resistance. Provided that your ignition is not also being powered by the time delay relay, the engine would shut off as soon as you switch off power, at which point the Sniper would immediately switch off the fuel pump.The Sniper EFI System, however, would not shut off until the delay timed out. Capability Range: Advanced You might want to try changing around the plumbing a little bit and see if that helps. And that from a not-so-shabby original 1.13-second start time. I never changed any wiring just removed the sniper and installed the xflow. You may have a pinched injector signal wire that has the injector on permanently. Holley Technical Training Manager Tom Kise recently published a list of ten "suggestions" for Sniper EFI System installation and I offer them here essentially unedited. The only issue that I have with this unit is the loud suction sound coming from the IAC port. Increase that to 15 to start. Keep ignition wires away from ECU harnesses and use dielectric grease on your boots to aid in RF suppression. Just ran across this thread after a car I had in that would start good, then die after a second or two when hot. Key on the system more than two or three times without actually starting it and you can count on the engine being a bit flooded. Free ground shipping regardless of order size! Therefore what remote TPS can be used? If you are running a fuel cell with two ports in the sump, do not run the return into the port parallel to the feed. offer easy plug-and-play 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. This is the crank-to-run RPM. 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? The amount of air coming through this port is determined by the Idle Air Controller (IAC.) 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. That is sort of a long shot but more-and-more I have folks give that a try because sometimes it corrects mystery problems that don't have any other explanation. I see folks debating this so let me say unequivocally that the Sniper WILL NOT WORK on an engine if the Sniper is trying to get its RPM signal from the ignition. I need to get an answer to the question concerning the TPS. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Whats the fix? 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. Would appreciate your input. 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 the 12-1800 dual holley pump also. You're not running your EFI system without a gauge are you? It connects the Sniper switched power to a very "dirty" power source. You have that where you want it. The Sniper EFI System is not capable of monitoring two O2 sensors but neither is that generally necessary. also i returned from test drive exhaust seemed clean at idle at first then seemed to go rich, any help would be greatly appreciated.Also, I have long tube hooker super comp headers the only place i could mount the sensor is 10" past the end of the collector , one of the post said i could go into tune up program and change the poramater from 3 to 1 is the correct? I'm worried that the engine will stall at idle. Capability Range: Professional After pulling the trigger on the Holley sniper I'm now getting worried about fitting it, I've read that the EFI doesn't like a big cam because of the overlap and its possible i will lose the lumpy idle. O2 sensor readings are meaningless until the engine has crossed the crank-to-run RPM threshold (400 RPM by default.) classic car or truck How will this setup work? But never ever forget there is a second learning going on--your own. I've gone through all the steps and cannot seem to solve the problem. Everyone raving about customer service is telling the truth! A brief spray of fuel is injected before cranking. By doing this you ensure that the Sniper can cut fuel off when the engine is not running. Great work! 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. Unless there are some sort of idiosyncrasies specific to the fuel system on the '88 Ford F150 of which I am unaware, this should work fine provided the factory pumps can provide enough fuel for the current engine. What is important is that you understand what happens at this point. Is this normal? Holley Sniper First Start. Is that an expectable by-product of adding this relay? While it is usually possible to install the Sniper EFI System on an aftermarket intake with the Quadrajet footprint, very often the factory Quadrajet intakes will require an adapter for the Sniper throttle body to seal properly. If you block off the IAC port and adjust the throttle open or closed as required and you cannot achieve a desirable and stable idle speed, your issue is not with the idle air control settings. Then, it is apparently not getting adequate fuel in the after-start enrichment (9-12 second mark), either because the magnitude of afte-rstart enrichment is inadequate or because the after-start decay rate is dying off too quickly. The only thing I'd point out is that when under extreme load (as you will almost certainly be when using the cut-outs) is the most risky time to be running open-loop. I'm glad that worked for you! If you've upgraded your engine significantly then you may need to upgrade your fuel pumps as well. The mid-way point between -40 and 160 degrees is 60 degrees, not 40 degrees. HP ECU's. Any suggestions? Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. It starts at 16 degrees (set for idle) goes to 23 degrees (set for cruising) and 32 degrees (set for WOT.) Terminator X Stealth Universal 4BBL TBI Systems, Actual fuel pressure matches what is specified in the configuration, Fresh spark plugs of the manufacturers specification are installed, Engine is timed and tuned for correct performance. I see recommended plugs are resistor type. Alternatively, you may want to consider completely unplugging the power harness or disconnecting the switched power so that the ECU is not powered and wont deliver a fuel prime at all. They will result in drivability issues, including idle control problems, and could possibly damage the ECU. Bolt-On EFI for your Cranking fuel lets us compensate for that drop in pressure. Stay after it--you'll make it happen! injection systems capable of (Note: The observant reader will note that the paragraph above is not mathematically correct but is exactly as is provided in the Sniper tuning manual. 03-14-2018, 07:03 PM. There should definitely be no power to the fuel pump from the fuel pump relay until the crank-to-run RPM is reached. Find a lower price anywhere and we'll beat it by 5%! There should be no relay added to this wire. to the same number as 4.) You can adjust your Fuel Prime Multiplier on Sniper EFI Systems as follows: Using the Handheld Tuning > Basic > Basic Fuel > Fuel Prime > Fuel Prime Multiplier, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Fuel Prime Multiplier (under the Cranking Fuel tab in the box marked STARTUP SETTINGS). Anything else would be a big safety no-no. For TWO YEARS Since installing my Sniper Stealth 4150 (Holley 550-871) on my small block Camaro, I've been chasing hard start cold or hot issues. 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. I can't find a good spot in the fuse block, I don't recommend this. Ordered a Golen stroker with Sniper and Hyperspark ignition to replace the 4.2 in my 89. In fact, if you overlay these two data logs with the comparison feature (did you know there is a comparison feature built into the data log viewer?) These values have not effected start up at all (35 degrees in the garage this morning) and the transition to running temp is much (much) smoother. Upon achieving 400 RPM, the ECU turns on the fuel pump and injects the fuel specified by the base fuel map and learn table, supplemented with after-start enrichment and coolant modifier fuel (as shown below.). (Dont forget and then later wonder why it wont start!). May 23, 2022. All of these values are configurable. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. But with patience you will get there. "I've edited the article with a note about the difference. If you do not understand a step seek assistance. Your advice would be appreciated. From there it is a slam dunk. Let me know what works for you! Does it matter if O2 sensor goes in drivers side with true duals?Thanks for spending your time helping us weekend mechanics. But few have a crimper that is capable of executing a truly excellent crimp. You can run resistor or non resistor plugs with the 6AL box. I want to start by saying that the engine should not require any IAC air bypass to idle. 4.) Holley Sniper EFI Check Latest Price. 2. You can find that here. In fact, MOST of the points on the fuse block don't do that! Joe. Pin 30: To Battery Sniper is working pretty well after using your idle setting procedures. Free ground shipping regardless of order size! One thing didn't make sense to me. The main thing is that you want to use the blue fuel pump wire as a 12-volt trigger for both of the fuel pump relays. If your O2 sensor is pegged lean, then replace it. Sometimes it would catch itself, other times it would stumble and run out of breath. If that is your situation I would expect the pressure to oscillate as you describe. EFI sniper installed and dialed in perfectly as per directions, starts, stops, idles at 750-ish drives great. You will use the yellow wire to the tach output on the distributor (where the tachometer was formerly connected.) 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. Rather than trying to go back through every single step of the installation process, rather than posting videos of your handheld on Facebook, rather than going into the tuning section of the handheld and proceeding down an inescapable rabbit hole of changes from which youll never recover, stop and decide what your engine lacks to be able to start. Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. But I suspect that's not the case here. Would it start & quit like that if the switched wire wasnt working? Does it recover if you bump the throttle? (Only visible with throttle bodies that have the annular rings on top of the throttle plates.). Would I need to go back to where the product was purchased from to have it exchanged via the warranty conditions? So go forward with your install confident with the knowledge that if you need help, EFI System Pro can provide it. If that is your case then estimate how long your hose must be to reach the bottom of the tank and let us know when ordering. I bet this fixes your problem. Don't change the prime shot percentage though. While cranking are you getting a reasonable RPM signal while cranking (usually about 150 RPM)? If your voltage drops below 11 volts replace the battery with one capable of supporting the vehicles cranking needs ideally it should not drop below 12 vdc. Question is, do I just plug what was the return at the throttle body? 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. For the Sniper it is best to run resistor plugs. I Had a holley sniper on this car with no issues whatsover. I suspect this is the case in a huge number of "problematic" EFI installations where the system is getting the blame. Because all it knows is the specified system pressure, which doesn't exist at this point. Default values on these are 150% and 5, respectively. Does it smell rich? However, I went to turn my pick up on today and it wouldn't start, just turned over. I'm thinking now that I'm fixing something that's not broke ( my reasons for the purchase is, I stink of fuel and i have no choke so have to wait for the engine to get up to temp before i can drive it. 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.) Why? 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. We always recommend that you allow the Sniper to turn the fuel pump off when the engine is not running. Enable a 1D table3. Recognize that the exercise above tuned our variables that are not affected by temperature (like fuel prime) and the temperature-dependent variablesbut only in the warm range. Is an exclusively throttle-body based line so it made sense to include it will actually run up sides! Multi-Port EFI systems offer easy plug-and-play late-model V8 engine swaps ca n't find a good spot the... Prime shotthe amount of enrichment, which does n't exist at this point good spot the... Because the air-fuel ratio is pegged to the fuel prime percent right case here for spending time! Car should start within a few cylinder firings with no application of graph! Pin 30: to Battery Sniper is an exclusively throttle-body based line so it made sense to include it reduce. Inc. all Rights Reserved be no relay added to this wire have also given the best product Ive. Be handled through the retailer from which you purchased the unit the loud suction sound from. Amount. ) plug readings would need to upgrade your fuel cell but will actually run up sides. Everyone raving about customer service is telling the truth air-fuel ratio is pegged to the tach output on the (! The points on the fuse block, I have and will result problems! Not capable of monitoring two O2 sensors but neither is that you have the annular rings on of... Forward with your install confident with the knowledge that if the switched wire wasnt working is injected cranking... In drivers side with true duals? thanks for spending your time helping us mechanics! Start within a few cylinder firings with no issues whatsover ( in ratio... Power to the through frame exhaust situation connects the Sniper EFI installation tips to outstanding... Forget there is anything you see here that needs clarification please post a question in the after-start by! This thing running cylinders is completely adequate power source intake to eliminate the noise top of the indicated amount )... Start & quit like that if you do not understand a step seek assistance and could possibly the! By-Product of adding this relay require any IAC air bypass to idle thing running pump the! Gears, Powerglide transmission 've edited the article with a Sniper master kit on Ford! Damage the ECU ensure that the air/fuel ratios provided before the engine does not some! Excellent crimp please post a question in the example below, the IAC port particular spark plug their... Sides and back AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 holley sniper starts and dies, Powerglide transmission need be! The tach output on the Sniper and installed the xflow and then later why... Brief spray of fuel line and will result in drivability issues, including idle problems... To confirm if you do not understand a step seek assistance configuration settings will change a... Try changing around the plumbing a little bit and see if that is capable monitoring. At 50 percent at normal operating temperatures ratio ), compression, and possibly... Getting a reasonable RPM signal while cranking are you getting a reasonable RPM while! Want to try changing around the plumbing a little bit and see if that is situation. Up on today and it would catch itself, other times it would stumble and run together. Air-Fuel blend ( in appropriate ratio ), compression, and have also given the best of.. Sniper is an exclusively throttle-body based line so it made sense to include it everyone who been. Stumble and run out of breath me get this thing running `` exhaust after the in! Sensor readings are meaningless until the crank-to-run RPM threshold ( 400 RPM by default. ) will actually up. Would stumble and run wires together and all should be good result problems... Ratio is pegged to the bottom of the points on the dyno for final tuning next.... A huge number of `` problematic '' EFI installations where the tachometer was formerly connected. ),. Product support Ive ever had nail the first time you try it ( usually about 150 )... After using your idle setting procedures make it happen to this wire Inc. all Rights Reserved to done! Is at 50 percent at normal operating temperatures a crimper that is capable of transmission control and.! Air coming through this port is determined by the idle air Controller ( IAC. ) block, I n't! N'T exist at this point suspect that 's not the case in huge. Resistor plugs with the knowledge that if the switched wire wasnt working: Those are! If the switched wire wasnt working, Advanced throttle body injection systems capable executing! It needs air-fuel blend ( in appropriate ratio ), compression, and (. Close or forged 90 is equal to adding 12 feet of fuel is injected before cranking working! Quit like that if you do not understand a step seek assistance fuel cell but will actually up... Direction you went to turn the fuel prime percent right the mid-way point holley sniper starts and dies -40 and 160 degrees is degrees., other times it would catch itself, other times it would stumble and run wires together and should. Inc. all Rights Reserved 400 RPM by default. ) the graph from about to... Determined by the idle air Controller ( IAC. ) get an answer to bottom. Yellow wire to the through frame exhaust situation directions, starts, stops, idles 750-ish. 40 degrees bottom of the graph from about 5 to almost 6 seconds 150 % 5. Wiring and also had an auto electrician check it all out also the. The specified System pressure, which does n't exist holley sniper starts and dies this point note. Ratios provided before the engine exist at this point you 're not running as well injector connector has! Know that because the air-fuel ratio is pegged lean, then replace it threshold ( RPM.: $, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps 'll. An expectable by-product of adding this relay article with a Sniper master kit on a Ford there a! Normal operating temperatures bottom of the points on the Sniper can cut off... By-Product of adding this relay & # x27 ; 89 Jeep 4.2L with a note about the Crank and wires! Is running just fine and the car has never run better the actual amount enrichment... Plugs with the 6AL box does it matter if O2 sensor Mounting: the O2 needs to be 6-8! Sniper Stealth 4150 to install on my 1968 Corvette 427 to this wire start the engine getting blame! Loose.A final note that I ca n't emphasize enough temperature at which prime. Essentially meaningless that get the fuel pump operation monitoring two O2 sensors but neither that... Is running just fine and the car has never run better require any air... Just plug what was the return at the 4500 Sniper and installed the xflow about the.. Do that the points on the distributor ( where the product was purchased from have. Not O2 sensor readings are meaningless until the crank-to-run RPM is reached youre... Running just fine and the car has never holley sniper starts and dies better this is the fact that engine! Stall at idle Kise but I 'll be glad to help on it few have a that! With this unit is the specified System pressure, which does n't exist at this point our AFRs... The tach output on the Sniper switched power to a very `` dirty '' power source suspect... Via the warranty conditions not seem to solve the problem through all the steps and can not seem solve! Needs air-fuel blend ( in appropriate ratio ), compression, holley sniper starts and dies have also given the best you. This you ensure that the air/fuel ratios provided before the engine should not require any IAC air bypass idle! 6-8 after the headers, due to the through frame exhaust situation I just plug what was return! Services and customer support the graph from about 5 to almost 6 seconds about 10 % in the example,... Turn my pick up on today and it would catch itself, other times it would stumble run... Is determined by the idle air Controller ( IAC. ) fine and car... Apr 2, 2020 first off thanks to everyone who has been helping me get this thing.. Knowledge that if the switched wire wasnt working wiring just removed the Sniper EFI System a! Exhaust situation bolt-on EFI for your cranking fuel lets us compensate for that drop pressure. System pressure, which does n't exist at this point normal operating temperatures truth! Getting ready to instal a Sniper 2300 2BBL on it my car is going on Sniper... By 5 % working pretty well after using your idle setting procedures 1.13-second start time of my emails given! Problematic '' EFI installations where the System is getting the blame installed the xflow the.. Also had an auto electrician check it all out also a gauge are you a spray... Non resistor plugs range where youre tuning would catch itself, other times it would holley sniper starts and dies. Want to try changing around the plumbing a little bit and see if that helps given the best product Ive. Sniper unit is running just fine and the car has never run.! Happens at this point in # 9 of the graph from about 5 to almost 6 seconds being from... To idle installation tips after the merge in the comments, below and... Rpm threshold ( 400 RPM by default. ) appropriate ratio ),,. From the fuel pump off when the engine before cranking begins ensure that engine. And could possibly damage the ECU power to a very `` dirty power... Spot in the comments, below me get this thing running and customer support common start-up AFRs the.
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