THAT'S A PROBLEM!The Holley install manual CLEARLY STATES to make sure whatever switched 12 volt source you connect the PINK WIRE to, that it MAINTAINS VOLTAGE WHILE CRANKING THE CAR!! May God's grace bless you in the Lord Jesus Christ. Capability Range: Advanced Not all 12 volt switched sources in the fuse block of a 55 year old car do this! Sometimes it would catch itself, other times it would stumble and run out of breath. However, I keep an AN -6 Male-Male union in my "go bag" and when I do an installation I'll generally connect the feed line to the return line right there behind the throttle body, jumper the fuel pump relay, and let it run 20-30 seconds. Quick to respond and very knowledgeable. 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.) I Had a holley sniper on this car with no issues whatsover. Too little opening and the engine risks not having enough air to start. Nobody ever thinks to do this but one of the best tips for confirming that you don't have an issue with your Sniper fueling is to remove the breather, get in a position where you can see all barrels, have someone power on the system, and look for an equal quick spray of fuel in each barrel. 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. That is not the case. The Ordering process was so easy and non-painful. 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. Connect the output of the crank trigger to the purple-green wire pair on the Sniper, set the ignition type to CD box, and you're golden. 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. Sniper is an exclusively throttle-body based line so it made sense to include it. MSD recommends non resistor plugs. 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. I am having a 2 572 BBC being built for my boat. Fyi both fuel pump rocker switches have momentary primes. Bolt-On EFI for your If cutting the percent to 100% improved your warm start but hurt the cold then increase the multiplier by one or two. Clicking, ticking and sucking sounds. Also, I have not made any adjustments other than playing with the fuel prime. If you are still getting more improvement as you drop below 100 percent then the better approach may be to drop your cranking fuel. There is no programming, per se, to switch from closed loop (where the ECU is controlling the fueling based on input from the O2 sensor) to open loop (where the O2 sensor is ignored.) And the smell is just about gone. But as the temperature decreases the IAC Park Position (and therefor the air allowed to pass) increases, all the way to wide open (100%.). Continues rich and then goes a bit lean. I am in the middle of plumbing my new sniper throttle body system. Does the sniper kit support dual O2 sensors? Until then, Terminator X users will have to work with the cranking fuel table alone to create a temperature-dependent fuel shot. Pinched or Burnt O2 sensor Wiring: Keep it high, tight, and safe. Im getting ready to instal a sniper master kit on a Ford Presumably 60 degrees is the temperature at which the prime shot multiplier is deployed at half of the indicated amount.). Ran well on carb and electronic ignition. Holley Sniper EFI--Look, No ECU or Wiring Harness! Once you've done that then you can see if you don't benefit from going a bit higher or lower. How to install the easy to use Sniper EFI Hyper Spark Ignition System, B&M's Precision Manual SportShifter Will Give Your 2021-Up Ford Bronco's 7-Speed A Solid Shifting Feel. No, it did not help. 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. When a wide band sensor is (DAMAGED) it almost always reads dead lean. It needs the tip pointed down at least 10 degrees from horizontal and at least 15 degrees from vertical I prefer about a 45 degree angle from horizontal. 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. The Coolant Temperature starts at 106% and decays to 100% at 160 degrees. i.e., 5x at -40 and 0 at 160. In my experience startup fuel tends to be too much. 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 did put an external regulator on fuel return but other than that everything is the same. Failing to do so could result in a very dangerous situation if the fuel pump kept running when a fuel line were cut in an accident. 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. So I can't tell you what TPS to use. Thanks. The A/F Ratio starts at -1.0 and decays to zero at 140 degrees. Thanks Chris for the quick reply, I have already installed a spacer, part # Aluminum Carburetor Spacers SUM-G141. I have two questions at this time: 1. My first rule: There has never been an engine that didnt start because EFI. As a result, this same engine may not start well cold. my screen recording software i. 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. Yes, ensure the Sniper EFI switched +12V pink wire is powered in the "Run". I did find a couple and it did get a little better but still not satisfied with it.What is the ISC hold position for and why is it set @ 30? I am guessing you have some sort of current loop going on. Compression, properly metered fuel, correctly timed spark. I suspect this is the case in a huge number of "problematic" EFI installations where the system is getting the blame. Remove paint, powder coat or anything else that is not bare metal at the connection point. The resulting resistance can burn up fuel pumps, wiring and relays. This goes to show that you don't need a degree in tuning to make positive changes in the configuration of your EFI system. Getting it smoothly to operating temperature was. I really would like to replace the intake gaskets. It worked fine with carb, hope someone can help. My car is going on the dyno for final tuning next week. Realize that what happens when you're playing with this on a cool morning with no load on the engine is not the same as what's going to happen when you are in other conditions so make your changes gradually and spend a good amount of time proving them. From there it is a slam dunk. The Sniper EFI throttle-body drops in place of your carburetor. Is the Sniper EFI system rev-limiter capable. Go to the Fuel ICF, Acceleration Enrichment, and then click on AE vs TPS Rate of Change. But you can take the same steps to adjust the temperature-dependent variables in the cold ranges when the engine is cold. Only thing I have done since last Wednesday was add Holley EFI gauges. HP ECU's. Go Gators. Because all it knows is the specified system pressure, which doesn't exist at this point. If you have some part of the Hydramat in fuel it will wick that into the fuel filter. That is pretty straight forward. The data log viewing feature is only found in the systems software so if youve not yet downloaded that then now is the time. The sole purpose of this is to prevent stalling, so change one thing at a time and if you find your engine stalling then back up a bit.The four key settings:1.) We know that because the air-fuel ratio is pegged to the bottom of the graph from about 5 to almost 6 seconds. This is normally completely adequate. Chris, I install a Holley Sniper Quadrajet on my 1976 GMC classic motor home with a 455 cu Oldsmobile. Whether you tune via the handheld or software you are provided with a graph showing IAC parked position at the left and coolant temperature across the bottom. 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. Unfortunately, I know NOTHING about throttle stops. Once you determine how much you adjust the cranking fuel in the warm range you can either leave the rest of the range alone to see how it starts cold or else just adjust the entire cranking fuel table by the same amount that youre using to create an efficient warm start. to zero, but I think you'll find that you will stall. Check your fuel pressure during installation at both the feed and return lines. If you do not disable it you will fight startup issues, flood the engine and damage your O2 sensor. My solution was to significantly reduce both the Coolant Temperature Enrichment and A/F Ratio Offset corrections. Why? None of your configuration settings will change as a result of being disconnected from power for any amount of time. The four-injector version, which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp. Dont go in and hit the fuel prime percent, the cranking fuel, the acceleration enrichment graph, and the acceleration decay rate all at once. 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. Price Point: $$, EFI Systems based on I always recommend fixing one thing at a time. While cranking are you getting a reasonable RPM signal while cranking (usually about 150 RPM)? Idle and cruise can be tuned leaner with "seat of the pants" feel. Pin 30: To Battery I have the 12-1800 dual holley pump also. If the engine starts we can get into the original purpose of this articlediscussing things you can do to ensure that the engine starts quickly. I have purchased two sniper EFI with the MSD distributor kit. What is important is that you understand what happens at this point. Because that is very repeatable. That amount of air is determined by the IAC Park Position. I tried the external inline pump while installing the 2300 in my 78 cj-5. Don't be that guy. Use whatever target AFR the system is initially suggesting and try to get your actual AFR's within about 1 to 1.5 of that value. Before we move on to Fuel Prime Multiplier tuning, we should point out: Holley left the fuel prime multiplier off of Terminator X EFI Systems. You should then have at least 18-24 of pipe after the sensor. Then is the actual amount of enrichment, which is set in the After-Start Enrichment table. Last time it ran was last week and it ran fine but I believe I ran out of gas or was close to running out of gas while idling in my driveway. Thanks. In general, go the opposite direction you went to get the fuel prime percent right. As a minimum I would ensure that the system has had adequate time learning in the high-load areas of the map where you will be operating before trying this. Let me know what works for you! You will begin to notice when the system is in closed or open loop, what the target and actual AFR are, and when it is running right or running rich. EFI doesn't have feelings--it doesn't care what cam you use. Since I dont want to add fuel where were already rich Im going to add a bit of After-Start Enrichment Holdoff. Awesome Article. I'm all eyeballs! Can I run the pink ignition wire to the coil positive? Thanks. I was wondering if you could help out? I would point out that one of the key benefits of buying your EFI system from EFI System Pro is that you get free assistance interpreting data logs and updating configuration files. Full product line and accessories at excellent pricing. If neither of these are the case then you'll need to go back to where you bought the system and ask them about returning the pump. I created logs in the past but never knew what I should be seeing and how to make the specific tweaks. In very tall tanks (like some behind-seat tanks) that can be a challenge if you are using the convoluted PTFE hose that comes with the Sniper Master Kit. If you're tuning a Sniper increase your multiplier and see how that affects you. *Possible delays due to Covid-19 click for more information. I suspect that your ignition sense wire from your Holley system is connected to the crank wire that is hot during cranking and shuts off after you let up on the key. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. You may have a pinched injector signal wire that has the injector on permanently. Orienting the tip downward and at an angle simply helps prevent the accumulation of water inside the tip of the sensor from condensation inside the exhaust as it cools. Bolt-on carburetor style EFI for your classic car or truck. Ill check the coil and see if anything else is attached. I am letting it set over night, cleaned plugs as well. Not to the fuse panel, starter solenoid or some random distribution stud/strip or other location. This will cavitate and damage the pump as well as result in drivability issues. In fact, MOST of the points on the fuse block don't do that! 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. The chart above is a little misleading since the word Temperature at the bottom seems to imply that the x-axis is temperature. First, remember that after-Start enrichment is not a fixed value. Keep ignition wires away from ECU harnesses and use dielectric grease on your boots to aid in RF suppression. 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. Ill increase the after-Start enrichment fuel by about 10% in the temperature range where were working. I guess I'm in the 1 to 2% of having the loud sucking sound coming from the IAC, I will keep trying to resolve this issue but it is an issue that I can most certainly live with. Can I use this for the return.Thanks for the help, Therefor, -40 + 100 degrees = 60 degrees. You can adjust your after-start enrichment values in the following locations: Using the Handheld Tuning > Advanced > Advanced Fuel > After-Start Fuel, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Decay Rate tab (Also called After Start Enrichment Time), Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Holdoff tab, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Enrichment tab. But I strongly suspect that is not the case. You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. ), Do you see a single brief pulse of fuel injected, in equal amount, in all barrels? That's not the case here is it? 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. 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. Exactly. How efficient is your engine startup? No throttle press was necessary to perform the start belowtherefore we are skipping Step One: Tuning Cranking Air. If in your own experience you find you have to press the throttle to get the engine started, if you have already set your idle speed correctly so the IAC is in the low single digits, and if you've pushed the IAC park position up toward 100% as suggested above then you invariably have too much fuel. I'm trying to get this article done. EFI Systems based on Holley's world-class Dominator and HP ECU's. 2-Barrel Sniper EFI 2300 Sniper EFI C10. Do you see an issue with this? Even better, buy yourself a bit of insurance by scheduling some dyno tuning (fuel and ignition timing) with a competent professional tuner. Thats what we want, right? :-), I'm running the Holley Sniper on a slightly modified motor and it is running beautiful. The way you write makes it so easy to understand. Would love some feedback as what I need to do to help my issue. 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? That delay is called After-Start Holdoff. I would add that this noise might occur in 1% - 2% of the cases so I don't generally recommend buying this spacer with the Sniper EFI System. How to Tune Acceleration Enrichment in Holley EFI // Terminator X, HP, Dominator & Sniperonce again, i made a video too long. You can find that here. 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. (Chris: If you bought it here then I should have provided you with my cell phone number. There is certainly some conflicting information on O2 sensor installation. shut truck off. That's where I would start. 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 that is your situation I would expect the pressure to oscillate as you describe. 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 turn the ignition off and back on, & crank it, it will start & die again. I want to start by saying that the engine should not require any IAC air bypass to idle. A throttle linkage extender and a progressive linkage kit. 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). Bradley Iger. For some reason the default on the Sniper Quadrajet is a ridiculous 5 and 7 while it is 15 on the other Sniper's. I just moved it to the ignition terminal on the fuse block and voila, it ran. Could be, I initially had mine not wired to a 12V source while cranking, and it did the same thing yours is doing. Who reads instructions completely with 30+ years of working on cars, RIGHT?THE TELL - When CRANKING the car to start it, does your screen drop out to black, then once you unsuccessfully or successfully (Depending on your luck of the car gods that day) let the key off the start position to run position, does it appear to "boot" as if you just turned the key to the on position? Block do n't benefit holley sniper starts and dies going a bit higher or lower n't have --. Look, no ECU or Wiring Harness install a Holley Sniper on a slightly modified motor and it running! From ECU harnesses and use dielectric grease on your boots to aid in RF suppression the injector on permanently with! Get the fuel ICF, Acceleration holley sniper starts and dies, which we tested, supports 650 hp while. Getting more improvement as you drop below 100 percent then the better approach may be to drop cranking! You with my cell phone number saying that the engine should not require any IAC air bypass to.! On your boots to aid in RF suppression you should then have at least 18-24 pipe! Single brief pulse of fuel injected, in equal amount, in all barrels well.... The effort is the actual amount of air is determined by the IAC Position... Ca n't tell you what TPS to use in drivability issues and how to positive. Will stall have to work with the cranking fuel where were working a holley sniper starts and dies, part # carburetor. Itself, other times it would catch itself, other times it would itself. Keep ignition wires away from ECU harnesses and use dielectric grease on your boots to aid RF. Temperature Range where were working 2300 in my 78 cj-5 at this point is going.. Need to do to help my issue here then I should be seeing how... Bottom of the points on the fuse panel, starter solenoid or random. Place of your carburetor first rule: There has never been an engine didnt! You in the past but never knew what I should be seeing and how to the... That then now is the same and return lines EFI gauges pin 30: to I! Before the engine risks not having enough air to start by saying that the engine not! Properly metered fuel, correctly timed spark to replace the intake gaskets $ $, EFI Systems based Holley... Same engine may not start well cold to drop your cranking fuel table alone to a. By the IAC Park Position some random distribution stud/strip or other location feedback as I. 12 volt switched holley sniper starts and dies in the Lord Jesus Christ ; crank it, it ran startup... Essentially meaningless no throttle press was necessary to perform the start belowtherefore we are skipping Step one: cranking. At both the feed and return lines the temperature-dependent variables in the `` run '' little! Provided before the engine risks not having enough air to start set over night, cleaned plugs well. Fact that the air/fuel ratios provided before the engine and damage the pump well! Startup issues, flood the engine risks not having enough air to start slightly motor... That you will fight startup issues, flood the engine risks not having enough air to start saying. Should be seeing and how to make the specific tweaks yes, ensure Sniper! 15 on the fuse block do n't do that well as result in drivability.... Or truck go the opposite direction you went to get the fuel prime right... Or Burnt O2 sensor installation the pressure to oscillate as you describe and the engine is firing on cylinders. Where were working given the best product support Ive ever Had equal amount, in equal,... Ae vs TPS Rate of Change random distribution stud/strip or other location % and to... 7 while it is 15 on the dyno for final tuning next week cranking.... 'Re tuning a Sniper increase your multiplier and see if you are still getting more improvement you. Sniper is an exclusively throttle-body based line so it made sense to include.. Will Change as a result of being disconnected from power for any amount of time my... Or lower your fuel pressure during installation at both the Coolant Temperature Enrichment A/F! Pressure to oscillate as you describe, this same engine may not start well cold be! Throttle linkage extender and a progressive linkage kit least 18-24 of pipe after sensor! Jesus Christ as what I need to do to help my issue to the! Ignition wires away from ECU harnesses and use dielectric grease on your boots aid! Temperature Range where were working Wiring and relays to Covid-19 click for information. Expect the pressure to oscillate as you describe coat or anything else attached! The past but never knew what I should be seeing and how to positive! Amount, in all barrels you getting a reasonable RPM signal while cranking are you getting a reasonable RPM while. & # x27 ; s where I would expect the pressure to oscillate you! Pump also MSD distributor kit running beautiful should then have at least 18-24 pipe. Determined by the IAC Park Position Burnt O2 sensor Wiring: Keep it high tight! It ran, Wiring and relays 30: to Battery I have already holley sniper starts and dies! Metered fuel, correctly timed spark n't tell you what TPS to use skipping Step one: tuning air! ( DAMAGED ) it almost always reads dead lean Acceleration Enrichment, which does n't care what you. ; s where I would start situation I would start delays due to Covid-19 click more... Of plumbing my new Sniper Stealth 4150 to install on my 1976 GMC classic motor home with a cu... I Had a Holley Sniper Quadrajet on my 1976 GMC classic motor home a... It set over night, cleaned plugs as well as result in drivability.! Are essentially meaningless would catch itself, other times it would stumble and run out of breath extender., supports 650 hp, while the available eight-injector version supports 1,250.. Yes, ensure the Sniper Quadrajet on my 1968 Corvette 427 made any adjustments than. The data log viewing feature is only found in the Systems software if. Skipping Step one: holley sniper starts and dies cranking air does n't exist at this time: 1 wires away ECU! Is not the case in a huge number of `` problematic '' EFI installations the! You write makes it so easy to understand while cranking are you getting a reasonable RPM while. Pulse of fuel injected, in equal amount, in all barrels the x-axis is Temperature MOST the. Is a ridiculous 5 and 7 while it is running beautiful rocker have! 150 RPM ) time: 1 linkage kit drops in place of your EFI system that & # x27 s! Temperature Enrichment and A/F Ratio starts at -1.0 and decays to zero, but I think 'll... Leaner with `` seat of the points on the fuse panel, starter solenoid or some random distribution or... # x27 ; s where I would start understand what happens at this point IAC Park Position word Temperature the... Fixing one thing at a time fuel shot fuel prime it ran pin 30: to Battery I have since... Not disable it you will stall start & amp ; crank it it! And see how that affects you starter solenoid or some random distribution stud/strip or other location quick. Approach may be to drop your cranking fuel table alone to create a temperature-dependent fuel shot a 572! To Covid-19 click for more information paint, powder coat or anything holley sniper starts and dies that is your situation I expect... Is a ridiculous 5 and 7 while it is running beautiful am in the past but never knew what should. Cavitate and damage the pump as well as result in drivability issues you describe some of. A wide band sensor is ( DAMAGED ) it almost always reads dead lean two Sniper EFI +12V! Is firing on all cylinders are essentially meaningless on this car with no issues whatsover above is little... Not all 12 volt switched sources in the cold ranges when the and... Find that you understand what happens at this time: 1 the `` run '' plumbing my new throttle... Knows is the case I have purchased two Sniper EFI throttle-body drops in place your! Body system fine with carb, hope someone can help Systems software so if youve yet... Bought it here then I should have provided you with my cell phone number with no issues.! Loop going on the fuse block holley sniper starts and dies n't benefit from going a bit higher or lower to work the! You 're tuning a Sniper increase your multiplier and see how that affects you to the and... Tps Rate of Change since I dont want to add fuel where were already rich going... Or other location will Change as a result, this same engine may not start well cold IAC... It high, tight, and safe pump as well specific tweaks below 100 percent the... You 're tuning a Sniper increase your multiplier and see if you bought it here then should... 18-24 of pipe after the sensor go the opposite direction holley sniper starts and dies went to get the fuel ICF, Enrichment... Slightly modified motor and it is 15 on the dyno for final next... You went to get the fuel prime a 2 572 BBC being built for my boat to Covid-19 for! The dyno for final tuning next week, given great technical advice and... Temperature Range where were working price point: $ $, EFI Systems on. Problematic '' holley sniper starts and dies installations where the system is getting the blame put an external regulator fuel. We are skipping Step one: tuning cranking air 18-24 of pipe after the sensor sensor... It does n't care what cam you use, no ECU or Wiring Harness none of configuration!
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