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I set the AFR at 13.5 and all is good now. Give it a watch: https://youtu.be/7SO7-tZn6iw. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. The IAC should display a 2-8% to bring the idle up to the actual target. Jun 12, 2021. That is likely just confusing the issue.Instead, choose whichever setup most resembles your camshaft and stick with that. Holley documentation and videos didn't work and the $300 I paid for "expert" tuning didn't work either. Hi. Does this seem reasonable and how hard will it be to get the idle and off-idle performance correct? Running new vintage air system so the is only a single power wire to compressor thats why I asked if I needed to run input wire to ac relay or if iac would pick it up fast enough(which its not). Thanks for the great question! Take it a step at a time. If you are idling at 2100 RPM (based on a default IAC Hold position of 30%) and your target idle speed is 900, then the ECU is not going to try to idle down. They also recommended that their ground be spliced into the Sniper ground as close to the Sniper as possible. It then idles up from 750 to 1100. I am having an issue with the IAC on the Sniper. The Sniper will be controlling the timing so it will be based on a multitude of factors. On EFI systems such as Holley's Sniper, all of the EFI sensors (except for the O2 and coolant temperature sender) are mounted snuggly in the throttle body. If the engine will after the 4 seconds that the IAC kick drops off then it's not really going to help.At any rate, it costs you nothing to advance the ignition and see if that doesn't improve the idle, right? It reads 0 at idle and when I accelerate it goes up to 30 and makes a loud sucking sound that seems to be holding the car back. I have verified that there are no vacuum leaks, not to mention the car runs to good to have a vacuum leak bad enough to make this noise. If you did not rotate the distributor to set the actual timing to 15 that might be the only issue. I started with right after I first adjusted for 2% IAC and took pics about every 30 seconds over about 2 minutes. You'll have to go back and forth a couple of times to get it just right. When you have the issue you should disconnect all hoses and plug the ports on the Sniper. Im not sure what its doing, have messed with after start fuel, fuel at cranking. Therefore The iac will always be at 10% now, correct? Thank you for any advice. Am I missing something. An undersized or partially plugged fuel filter is a classic EFI installation mistake. = 2.34 I have a Holley Sniper EFI with HyperSpark ignition. We have never had that problem with any of the units that we have shipped. Follow this link to download it for free if you have not already done so. Or, at least, it should. The following are status commands and diagnostics for sensor and various parameters in the Holley software. At low levels RF interference will often reset the ECU so quickly that the engine will not stall. A couple of those and you should feel it getting better. Two months fighting, cursing, not getting any help from Holley OR the forum, and a stupid little tin plate. But once you come off the throttle there is a minimum RPM that the ECU wants to see before it releases the IAC from the park position and that is normally 1000 RPM over the target idle. i'm having is I can't seem to get the truck to run faster than 45 mph at speeds Wish I knew about it before I made my purchase. There are two ways to address this--you can let the system learn or you can manually adjust the acceleration enrichment. Start engine let it warm up to 160, learn mode is learning. And your question is very perceptive: You must first know whether the bog is a lean or a rich condition before you can make the correct adjustments. Save Share. Holley Sniper Iac Delete Those don't impact the way the engine runs and can cause the whistle sound you describe. You're going to have to clean up the wiring in your engine compartment, In particular, look for spark plug wires that might be running near your throttle position sensor. :-). Do you have a PCV on the engine? 400 engine, C6 3 speed automatic, with standard canister coil for ignition, and We've already tried adjusting the Acceleration Enrichment chart in all ways, going up and down, RoC Blanking, everything, it has no effect. Sometimes an engine can produce enough vacuum to pull the secondaries open slightly. First, let me congratulate you on your patience in letting the system learn. When I am coming to a stop, the rpms will hang at 1200-1500 rpms. Two things to keep in mind as you do that. Cl. He thought that something was wrong because when he set the idle 50 RPM below his target the resulting IAC postion was far too big. I put it in neutral and the idle RPM had increased to 2100-2200. A problem since day 1 - YouTube Leave a comment if you've had this issue and how you resolved. Car has run perfect every time and has never hesitated or stalled since. As I said above, you could have a bad IAC, but then again, the IAC might be fine and there's a deeper problem such as RFI noise causing the issue or a vacuum leak that is confusing things. Note that sometimes you can get into a back-and-forth situation. Enjoy! Hi I wish I had bought from you but I didn't find this site until now. I did all of this before seeing the link you sent. In this short video you learn to replace the IAC. However, I can't think of a single one that was because of low vacuum. If the engine idles at 750 RPM with the throttle plates all the way closed and the IAC at zero then there is some sort of an issue. In the datalog the engine is running at 1400 RPM, TPS is zero, IAC is zero, CTS is 185F but it's in Open Loop. Seems to behave more better now. Idle Tuning is a very important part of tuning any EFI system, especially our self-learning units like Sniper or Terminator X EFI. Hey Chris Wish I had bought my sniper from you, but unfortunately didnt. They tell you to ask call Holley. I do know that the reference angle is 57.5, the inductive delay says 100.0. I think in some of the Wizards with the handheld it doesn't use 57.5 as the default. If it is then something is commanding the ECU to open the IAC. Some advanced conceptsIf you have the Sniper Can-Bus to USB Adapter, you can connect your laptop, open the software to the learn table, and get a visual for where in the table you are experiencing the lean bog. Hi Chris thanks in advance for any tips. shut truck off. This is a mighty big subject for a blog post reply, I should probably start doing some videos on this. I would suspect something is coming loose causing a stop to the EFI system/Fuel flow. I would suggest at that point you need to contact whoever is providing your tech support and find out why the default values are not working for you. Holley EFI Electronic Fuel Pressure GaugeI think its a little ridiculous that I cant see fuel pressure on the display even though its measuring it but whatever. After only running for about 15 minutes or so the system starts to fail stalling the motor. Bolt on 4150 Flange Carburetor Replacement. Suddenly, the engine accelerates alone, hears a great deal of air being sucked in, Has a good size camshaft cant find any vacuum leaks. But after sitting static idling for a little bit, the IAC goes to 100% & stays there. If I go any more it will ping. I can tell you that when things aren't working the way you wanted them to work that nothing beats knowing for-sure that you don't have a fuel supply problem. back to trying to zero down an idle. No problems with either cold or hot starts. Start with the most gradual throttle input you need to launch well, then slightly increase until you feel some stumble. Since a key cycle resets it to 0 and out to 30 or wherever Took it for a lap around the block and came back. It only lowers to 2-6% when I take my foot off the gas. A few, however, get tangled up getting the idle control working just the way they want. idle at 1100 on the "stock" file it's better with street strip.The IAC counts will be at zero. When I turn the key on I can hear it prime, but I don't think im getting enough fuel. Did your process to adjust idle to 860. I think you'll be all set! I can get it to fire up on the I'd recommend you contact Holley Tech support to get their input (1-866-464-6553; call early for the shortest wait times.) However I do have a couple of issues I hope you can help me resolve. Simply use your handheld controller and go to the Tuning > Advanced > Advanced Idle > Idle Speed screen and click on the Idle Speed Curve function. The idle is 1350-1400 with the idle screw at initial contact. Even though the Sniper's fuel map is programmed to provide the correct amount of fuel via injectors spraying at 60 PSI, if the pressure is jacked up to 90 PSI the wideband sees that you are rich and faster than you can even detect it audibly lowers the duty cycle to inject the correct amount of fuel. And if you're going to go this route I'd recommend that you switch from "Simple" (3 A/F targets, one each for Idle, Cruise, and WOT) and go to the 2-D Table Hope this helps! I installed another return spring for the rear plates problem solved instantly. Im in Australia, so stuck the sniper on a 355 Holden engine with CD box. Could you provide me with some things to check or some things to adjust? When I see that your TPS is 1%, that tells me that you may have an RFI problem. would correct it (as it has for a multitude of other drive-ability issues) but this one little glitch seems out of it's range. You may have to register before you can post: click the register link above to proceed. If I put the truck in neutral the TPMS will raise all the way up over 2000. Bryan McTaggart 02/28/2023 news Interesting question. Um, no. All of the wiring exits below the rear fuel injector cover, for a completely stealth installation. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. These are "transitional" cells, and you really have to make the effort to learn in these areas of the map. It's all part of the pleasure of EFI. :-)Yes, learn impacts idle too, and remember the even when the basic learning is done there will continue to be some learning for changes in weather, altitude, etc.Go ahead and try a few idle settings and see how they impact the idle-speed searching. You mentioned going from 13.5 to 14.2 but you'd want to go in the other direction--maybe to 13.2. 3 different fuel pumps. Im thinking a faulty TPS. That initial rev is going to be determined by your IAC Park Position. I would gladly engage with you to solve this but ultimately you are going to need to go through whomever you purchased the system if a warranty return is in order. Tried that and it didn't work? We are using Target AFR of 9.0: 1, Fuel Base approximately 40% higher. My IAC was constantly at 100% at idle. My car will now start when its cold, but after about 30 seconds the idle drops down and begins to run like crap. But if I take off from a stop and go to 1/4 or 1/2 throttle its fine and takes off like a banshee. Consider adding fuel in the AE vs TPS and/or AE vs MAP ROC tables in the area where the stumble is occuring.Since this is happening at such low TPS levels it is possible that your engine would prefer a lower (richer) target AFR number at idle. That is certainly not normal! I'm Having trouble with the Sniper on high Idle. EFI Systems based on Holley's world-class Dominator and HP ECU's. Bolt-on carburetor style EFI for your classic car or truck. Its just at low speeds, not sure if its loading up or leaning out. If that happens then follow my 10-step process shown above. You might have a bad IAC, but you can also have a bad vacuum pod on the transmission. Good The symptoms I had was a low cold start idle and going lean coming to a stop. :-). Holley EFI Electronic Fuel Pressure Gauge, article on choosing between Sniper and Terminator X throttle body solutions. I think I figured some of my problems outI'll try to explain. (I'm running from a fuel cell on the garage floor 10 feet away with lines in plain sight and do see fuel coming from the return at a decent flow. Yes, let me know how that setup process works. Hello, Chris, thanks for the help.I have not installed the software yet, and I'm having trouble with two cars. Top 10 Sniper EFI Installation Tips from Holley's Tom Kise Did you find this enlightening? It will need to see it again and again. Your second problem should be a bit more concerning. Inj. and if you do run into any problems then, yes, the plethora of tunability adjustments available through either the handheld or the Sniper Software will certainly be enough to get you right where you need to be! The 10 step set up on your page set my idle perfect and iac perfect a very consitant 700. My car will not idle right until it gets to around 130 -140 degrees. That is the first thing you must find. So you installed your Holley Sniper. Enjoy your Sniper! I can have it working fine (5% to 10% at target idle at operating temp.) In fact, it is those users who seem to end up most impressed with the system. But nothing beats a good solid gut-check For someone in your position, it will become an indispensable tool in your tool box. Holley Motor Life )Then look a the datalog and find out what TPS ROC and MAP ROC is most likely to cause the problem. It is made by one of the biggest names in fuel filters and sold under the Parts Master label so it is quality and great price in one. Now, 1% on the TPS isn't a problem, but when it goes to 2% (which is inevitable if you have RFI moving it to 1%) then the IAC is going to go to it's hold position (30% by default) and the engine is going to rev up. I also raised idle at Park a bit with the idle screw. Coming home from work today it was much warmer and took a little longer due to traffic. Look over all of your vacuum lines and fittings. 680-700.I can't find any reason other than it looses where it is in the firmware with Also when ac kicks on it will idle down and stall. So if you are trying to achieve a stoichiometric mixture in ethanol (which is achieved at an AFR of 9.0:1) then you should continue to target 14.7:1 since that is what will be displayed. Hopefully replacing the pump again will resolve both issues. Hang in there--you can do it. I am new to the EFI scene but want to learn. Always had to set idle above 950. Remember that as an EFI System Pro customer you have access to me at any time via my cell phone. Once we recognize that, the next step is to narrow down all possible sources of additional air until we discover the cause.Start by keeping an eye on your IAC number. I believe that for the HyperSpark the Reference Angle should be 57.5. Cycle the ignition as instructed by the handheld and then navigate to the distributor setup screen. That is what I really respect about Holley. Covered the IAC port and set idle for 850 ish. IAC Pos.% = 0 Hot start it most of the time wont start unless I give it a little throttle. Hi Chris , greetings from Down Under (AUS) Just a note on the hi fuel pressure issue . issue. And, while that is happening, make a note of the temperature before you engage the starter, and then the rpm when it starts.The Idle Parked Position is set on a temperature-based graph like the Idle Speed Curve. I know its not flooded because I can pour a little gas in the throttle body and play with the accelerator and it will start and run fine. If the TPS is even just 2%, the IAC will go to the hold position (normally 30%) and will not change until the TPS goes back below 2%.If you create a datalog you will be better able to confirm if something is not working correctly. It is a common one. Though it started and ran good, it was dumping fuel and would not lean out to AFR set points. That is not a huge problem but it just means the IAC has no ability to lower the idle beyond what it is running at that point. Very annoying ended up being simple my rear plates would stay open constantly it was driving me nuts I'd let off the pedal idle at 1300 blip the throttle a few times finally come back to 850. First--besides the fact that it's not represented on the display, it is not even a parameter that you can datalog. I am at the point where I almost insist that every Sniper EFI System owner purchase one of these. Holley Idle Air Control Motor Idle Air Control Motor Fits the Following Applications: Sniper EFI 90 mm, 92 mm, 102 mm Throttle Bodies Digital Pro-Jection Systems Avenger 4-bbl TBI Commander 950 Terminator TBI If the connection is loose it will cause the system to shut fuel off because the signal telling the EFI the motor is turning stops (to prevent excess fuel from being dumped in the motor). This will go a long way to improving your fuel map without manually adjusting the acceleration enrichment. The Super Sniper will allow you to monifor fuel pressure if you add an electronic sender but this is not an option with the standard Sniper. But if you can datalog the bog you can know much more precisely what is happening. Laptop Access You can re-enable this after you have completed this idle speed adjustment process. As you have noted, each time the idle goes up. When you first posted this I had no idea how to respond. Shutoff engine wait 30 seconds, turn key wait for display to come up, start engine. I have one customer who is having some similar issues and his AFR is down at 9.6:1 when it won't start. I also tried changing roc/map to 8 from 15 again no change at all.My ve table is smooth and tuned I even changed my AFR to 13.5 from 14.2 and no change at all. My issue is that when Im in stop and go traffic, I can let off the clutch and the engine revs and doesnt quite want to come back to idle. After pumping the pedal a few times at different times it dropped to zero and started to work. The idle will not return to the set value.The second issue is the same as the first but the motor will stall out. I have a set of 8.8 Accel Rfi suppression wires on it. If you feel you have no other choice but to run a Sniper and stand-alone controller then you can give this a try. The first place my eyes go when there is any issue with the idle is to the TPS value. Holley Sniper IAC Surging???? A problem since day 1 - YouTube I had a customer who struggled to understand that. My Sniper started having a ticking noise-- I have 90 miles on my Sniper, but this started the last 10 miles or so: it still drives fine, but it worries me so i've stopped driving it for now. Thank you for this guide on setting IAC. After the start process, If the idle speed is higher than the target idle then the IAC should begin closing as long as the TPS is below 2%. If I read it correctly, the solution from the other thread seemed to fix a constant 300 or so RPM increase. Get that thing installed and you're going to know a whole lot more about what's going on. Do I need to try taping up the IAC port and setting the idle off the idle screw? The Sniper even has a feature that allows it to use the idle timing to control the idle speed. Without it you are working in the dark. So as much as I can I have been taking off real slow and let it fall on itself to try to learn and its not learning its way out of it. technical rep said "You ahve high fuel pressure". First, recognize that the amount below your target where you set the hard idle will be different on different engines. What is it supppse to be at idle and while driving under heavy acceleration? Does anyone have photos of this additional return spring they installed? My sniper is doing two thingsFirst issue, the idle is set at 800 and will idle fine, then There is a glitch in the system. It might be necessary to insulate or re-route your fuel lines if this can't be solved any other way. I installed a Holley Sniper on my Ford Maverick 302 V8. Since the load is more of a wave that increases the most initially and then decreases again, the ECU is doing really well to get the idle under control in only two or three over/under shots as you describe.You don't mention if you have your Sniper ECU controlling timing. The problem I believe this is creating is after I start vehicle (and its still in park), the IAC drops down to my hold percentage of 10% (since throttle % is not 0) before engine is warm and therefore causing the engine to stall out. Running a bbc with coil - my timing is perfect. These aren't generic newsletters either but instead personalized emails. All times are GMT-6. Even though you think your timing is perfect I'd suggest you try cranking about 5-10 degrees of advance into the distributor and just see if that doesn't work better for you.Remember this: adjustable timing pointers go out of adjustment and harmonic balancers slip. Anyway I have a 327 sbc in a 1987 Monte SS with a T5 5 speed and 3:73 posi rear. close to idle with the IAC between 2% & 12%. The team at EFI pro are some of the best I have ever dealt with when coming to ordering parts or having the knowledge to answer any question you may have. Your task will be to find that. This software is going to allow you to open both the configuration file and the datalogs that you create, overlay them and you can get a much better idea of what is happening. Sniper EFI - Holley Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. % = 49 How can I adjust the startup speed down to about 1400 RPM? Full product line and accessories at excellent pricing. Camshaft is M-6250-B303 .480 lift intake & exhaust, duration at .050 is 224 degrees for intake & exhaust. The Sniper Quick-Start Manual provides the following instructions for setting the idle. Properly configured, the Sniper does a fantastic job of responding to the transition from Park to Drive. Thanks again. After 50 on the throttle position I'm not sure if the whistle goes away or you just can't here it anymore. I have seen a couple of videos on you tube of the same issue but they don't seem to have found the cure.I hope it is not a computer problem as I have already replaced the entire system because of another problem. Super helpful and knowledgeable. i would have been happy to answer there. Then it will ramp down to 1200 but will not return to idle. A question I cannot get a 100% answer on is can you piggy back off the Sniper EFI TPS for an electronic transmission? It's going to be really difficult to nail down the problem with the several simultaneous changes that you've made. Okay, try my method. :-). I have a Holley Sniper for almost 11 month now and it was running fine with no problems until now. Just getting it to act right at startup is a struggle. Running the vacuum advance and of course I time it disconnected. To do this, open up the Initial Startup gauge screen that was used in section 17.0. If I read it correctly, the solution from the other thread seemed to fix a constant 300 or so RPM increase. Will restart but only for a minute or so a couple of times then shuts down fuel delivery and will not restart. When the system is up and running the fuel pressure regulator inside the Sniper is making a rattling sound like a shaking a paint can. I got it home, checked it all over, everything is hooked up correctly. Common killers: No filter in front of the pump, reverse wiring, driving with PWM voltage, running at dead-head pressure.Since it sounds like your pressure is right, and since the Holley system doesn't provide a PWM voltage, that pretty much rules out everything but the lack of a filter. By the way, this is a new installation on a 69 Camaro, stock 350, dual sync, etc. If you find that adding 5-10 degrees of advance helps then it's time to do reconfirm TDC. If no air is passing (and the idle doesn't drop) then your IAC is working. Do you have any clue? At idle my IAC is 3-4, AFR around 13-14, TPS is 0, timing 15-17. Member List; Calendar; Forum; Holley EFI; Sniper EFI; If this is your first visit, be sure to check out the FAQ by clicking the link above. Learning to install these is great--you're about to embark on the next great adventure of advanced troubleshooting. You'll be amazed at how much of this just "goes away" when you drive it enough. So the issue Im having is low idle. I can drive it a bit but pops through the throttle body when pulling out from a stop (4 speed) and sometimes in the exhaust out on the road. other things that might cause the idle to faulter, but this is a good start. I used the Casper's Electronics 108103 splitter and carefully soldered my connections. Any help would b great. Sorry for all the questions, new to the efi world. I tried adjusting my IAC up to 10deg in both directions with no change. When running it will only stay in closed loop and learn at idle. Thanks for the information you have provided on this site. We can not hit it at all, we hit the pedal abruptly, the engine gives a lot of excess fuel, the AFR gets super poor at first, the car stops, then the AFR gets super rich and the car runs until it cleans up. Intermittent stalling usually points to radio frequency or electro-magnetic intereference (RFI/EMI). Mechanical Fuel Pressure Gauge on the inlet of your Sniper, now is the time. Fortunately, these are much easier to solve. In the context of the Sniper the AFR that is being displayed is the AFR of ethanol-free gasoline based on the lambda that is being read by the AFR. To keep it running in gear, I have to bump the neutral idle up just over 1000 RPM. As soon as I got the new one installed and wiredit fired right up and did everything it was suppose to do with no issues.
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