Since the shield was put on, not a single problem, not one. Thanks for the info Chris. Could you provide me with some things to check or some things to adjust? The "Gauge Text" is what would be shown on a 2-1/16 gauge or the Avenger handheld display. Then your low idle problem will go away. Always had to set idle above 950. But now that Terminator X is available, I highly recommend going that route. The Sniper ECU can use the timing to help maintain the idle speed and that will definitely be useful in that transition from Park/Neutral to Drive.If you don't have ECU-controlled timing, or if you do and it's not fully compensating, it may be necessary to increase your target idle slightly. Yes its at 95lbs, needless to say he promised a new regulator would be in the You are aware of the idle-up problem. If you patiently adjust this over the course of days you will get it just right.Again, glad this is working for you and look forward to a good report in the future! If I'm driving along and pull up to a light and leave it in gear it idles just fine but it seems not to be able to compensate if I put it in neutral and then back and drive. The first 250-300 miles were amazing as the Sniper EFI worked flawlessly. I think in some of the Wizards with the handheld it doesn't use 57.5 as the default. Ran 2 Holley carbs and an Edelbrock. 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. I keep doing that with the same result. I'm so glad you found this helpful--that makes my day!Don't get too concerned about the specific learn percentage. Then a little faster--until bogs at that level work themselves out. The problem I'm having is I cant get the IAC to drop down off 100%. Having a TPS that won't go lower than 9% will affect the acceleration enrichment correction, and could create a stumble at the first moment of throttle opening.Yes, the IAC can and will fluctuate depending on changing conditions. So this is my issue ( I did just email Holly). On startup- cold or hot, I get a 2 second high idle of about 1500 RPM before normal set idle of 750 RPM happens. You've got it running and warmed up but now you need to set. Relatively new Sniper EFI install on a '69 Mustang 302. No timing control, coil negative ignition type. In the setup, I set the hot idle for 850. That is certainly not normal! datsun sniper efi Holley RetroBright This 1974 Datsun 620 Bulletside Cruises With The Help Of Sniper EFI Bradley Iger 01/13/2023 features Latest News sweepstakes 2023 Hemi Engine Sweepstakes Gen III Hemi Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! Find a lower price anywhere and we'll beat it by 5%! The fuel pressure regulator in the Sniper is fairly simple and not prone to failure, as far as I know. The broad consensus has been that the Sniper is an amazingly straight-forward install and starts and tunes as expected. It is a common one. Plus, you can email that file to me and I can be of more help. If you haven't installed a I can have it working fine (5% to 10% at target idle at operating temp.) Yes, having an accurate TPS is very important at idle. Chris I am having a little different idle problem I did your -40 thing and that help with high idle but my problem is it idles fine until I drop it in gear and it stumbles a couple times catches up and then idles fine again. I've helped folks work through a number of challenges with their Sniper EFI System installations. Hi Chris I didn't get any traction on Holley.com 34K views 1 year ago Holley Sniper How to Set The IAC Idle air Control in 5 minutes or less. I recently install a sniper efi. IAC Calibration / Hanging rpms | Team Chevelle Going lower with the blanking might pay dividends, but there is so little room below 7/8 that you will quickly be in a range where every tiny variation in the TPS or MAP is throwing extra fuel into the engine. I have been able to get it pretty I would disregard any correlation between idle control between the Stock and Street/Strip setups. Two things to keep in mind as you do that. So, if pressing the throttle is making it start, it's because you're flooded.Which is consistent with your rich idle condition comment, right? I can adjust at 160deg, but my fans turn on at 180deg. I'd suggest that you assume everything the previous owner did was wrong until you can prove that it was done correctly. WIthout knowing quite a bit more it will be more than challenging for you to identify the problem and solve it.Fortunately, Holley provides their amazing Sniper Software. View Holley Sniper EFI Self-Tuning Kit - Shiny Finish. If the TPS reading on your Sniper EFI System does not reset to zero that is a problem that needs to be addressed. I have a Holley Sniper EFI with HyperSpark ignition. Relatively new Sniper EFI install on a '69 Mustang 302. and go to restart warm, it catches starts for a flick of a second, drops to a stall, or sometimes will catch its self and start. such high fuel pressure. One of them might be faulty. It's all part of the adventure! I would suspect something is coming loose causing a stop to the EFI system/Fuel flow. Once you so this, and after you have your CAN-to-USB harness attached to your laptop with the Sniper software, you can see precisely the cells where the system is operating when the bog occurs. Thanks for all your help Chris! If I put the truck in neutral the TPMS will raise all the way up over 2000. EFI System Pro had everything I needed for my EFI upgrade. After much diagnosis, I ended up replacing the intake manifold gaskets. From herethe cycle continues and I am The first thing I'd do is check your fuel pressure with a gauge like this. Shut off car/restart and it's back to idle at So check that timing and I think that you're going to find you need a good bit of advance. Switch power to the Sniper on and crank the engine. But after sitting static idling for a little bit, the IAC goes to 100% & stays there. When you open your IAC to 30% you are naturally going to have a high idle condition. Sorry for all the questions, new to the efi world. The window you saw in the image above pops up. If you find that adding 5-10 degrees of advance helps then it's time to do reconfirm TDC. That is likely just confusing the issue.Instead, choose whichever setup most resembles your camshaft and stick with that. Several good bits here. This happens no matter how much I adjust the idle screw. Are these compatible enough? Ive had an idle at neutral as high as 2400 rpm. The very first thing I would do is get ground truth on your timing. https://www.gmperformancemotor.com/parts/19210007.html, http://forums.holley.com/showthread.3128#post83128, If this is your first visit, be sure to Hello, Chris, thanks for the help.I have not installed the software yet, and I'm having trouble with two cars. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Holly offers a very nice Analog-Style Fuel Pressure Gauge that is another option. Good luck! If you datalog the Sniper ECU and see multiple overlapping traces for the same signal, you likely have RF-induced problems. It has gotten a little better after I drove it for three hours today.I want to save the Kik because if I get this working good then I would like to add A C and use the kick for it.Motor is Mopar 360 with mild cam and automatic. If you drop it too far the engine will stumble or stall when coming off the throttle with the car out of gear, so you'll know when you've gone too far. Remember that as an EFI System Pro customer you have access to me at any time via my cell phone. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. If I cruise down the road at lets say 60 mph and lay into it, she will take off and go. Which means you either need to increase that number or increase the ramp decay time. It started right up and we did your idle control fix and all is good at idle. Now, in my lifetime of experience with Holley ECU's that seems unlikely, but this guy sounded really sharp and had nothing to gain by convincing me of his dilemma. It would be possible to set up a 1D or 2D table and do something like this, so if you've gotten into these advanced setups then that would be another thing to check.If neither of these work then I'd recommend that you do a data log of the engine idling as the temperature is reaching and then exceeding 200 degrees. When I see that your TPS is 1%, that tells me that you may have an RFI problem. We do that but most places don't. First, recognize that the amount below your target where you set the hard idle will be different on different engines. Holley Sniper How To Set The IAC (Idle Air Control) in 5 - YouTube Full product line and accessories at excellent pricing. Your AFR is pegged lean. I have installed my Sniper and the car runs great. I've abbreviated it just a little bit but am appreciative of the added insight your comments provided.Off-idle performance can really be a challenge to self-learn but be assured that it can almost always be done. I have checked the pink wire and it is at .001 volts when key is off. 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. I've increased the IAC rampdown time to 8 seconds to try to combat this, but wondering if it will correct itself over time or if I need to possibly replace this TP sensor. Either the Walbro pumps you are getting are not genuine (lots of forgeries being sold) or else you have something that is killing them. Any idea's? Changing the rpm curve and target rpm has no effect. Data logs show no EMI/RFI. It is good to at least know that the Sniper fuel pressure regulator can have high pressure failure issues (contrary to what I posted to Scott back on April 13th!) sniper Installation 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! If I read it correctly, the solution from the other thread seemed to fix a constant 300 or so RPM increase. Until the engine starts, the throttle only has one purpose: To detect you pressing it to 60%, at which point it shuts off the fuel injectors. I believe that you have this problem solved now with your new inline filter/regulator. Is there away to lean the idle out? The Sniper EFI remote IAC (Idle Air Control) and plug is designed to gain installation clearance on some Sniper EFI 2x4 installations. Worst case you'll have a spare on hand, and if the TPS is faulty you will have solved the mystery. If you get into the practice of hearing all three of these sounds you will know if you have a problem even before you turn the key to crank. A few, however, get tangled up getting the idle control working just the way they want. I asked him a million questions and waited a long time to save up before purchasing the system and I have asked a lot of questions throughout the installation process. Pw. Clearly, something is changing. I did read some comments on regulator issues is there a way to check it for an issue ? Um, no. 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. Took it for a lap around the block and came back. Ensure there isn't a vacuum leak causing the IAC Position to drop to 0%. I will turn it up some more.Is this something that the ECU will learn? The fuel pump is mounted under rocker panel as low as possible and far away from any heat. As I said I didn't buy from you so you don't owe me anything. And increasing your idle via the idle screw was also a good idea, because that will lower your amount of IAC that is necessary to keep your engine at the target idle speed. Even at 0% it's sucking a bunch of air through the IAC port. If you've been running a filter then you have to wonder if you have a legitimate Walbro pump.If you install a new pump and the noise is still coming from the Sniper EFI System then only the dealer who sold you your system can help you. I followed the instructions and set the IAC to 2-9% when warm with idle at 850 RPM. There is no sense proceeding until your TPS is at zero at key-on. If you have an installation or start-up issue that is nagging you then please use the comments section to reply and we will gladly provide more information that we hope will be useful to you. First, I'm kind of insistent about not changing any of the default settings unless the vehicle absolutely will not cooperate enough to drive/learn, and only then if you have a specific understanding of the problem and a specific solution. He said they have been having an issue with these lately. The ticking is inline with the fuel pressure I feel squeezing both the fuel return & delivery lines (like a heartbeat). Then it changes and will not idle down, the handheld will display 0% IAC but you can see and feel that the IAC valve is more like 100%. 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. Featured Products EFI - Fuel Injection $2.59 - $6,499.95 2179 Products View Parts Sensors Those don't impact the way the engine runs and can cause the whistle sound you describe. A common issue we see is a result of poor fuel pump grounding running a eyelet from the pump ground to a rusty or painted surface. They tell you to ask call Holley. The team at Holley has designed the perfect solution for your problems. This is very disappointing as people love to hear the motor while the hood is open.Thanks Jon. Running a bbc with coil - my timing is perfect. Mechanical Fuel Pressure Gauge on the inlet of your Sniper, now is the time. Idle > IAC Kick. i would have been happy to answer there. Since that has long been corrected we have moved that information to the bottom of the article.). Thanks in advance for any advice. You can drop it down and you will find it will behave more like you expect. 400 engine, C6 3 speed automatic, with standard canister coil for ignition, and Take it a step at a time. Generally, one of two things: a stuck throttle or noise on the TPS signal. Both Sniper and trans controller grounds were direct to the battery ground, as they should be. Holley Sniper IAC Problem - Holley Performance Products Forums When I finished the install on my C10, I set it as follows: 13.1 at idle, 14.2 at cruise, and 12.9 at WOT. Replacement Idle Air Control (IAC) Motor for Sniper EFI TBI Systems, Sniper 90/92/102mm Throttle Bodies, Terminator TBI, Avenger 4bbl TBI, HP 4bbl TBI, Commander 950 & Digital Pro-Jection Systems. The person I bought it from said he never could get it to run for more than a few seconds. Turning off and then on again, the engine returns to normal. Thanks for sharing that, Jason--great info! Your second problem should be a bit more concerning. Incorrect connections will result in excessive resistance. You can manually set it 57 after you run the Wizard if required. Don't know if I should put this in a separate post. If you can track specific engine coolant temperatures where the engine stumbles and dies that would be a good place to start. Then why don't you Get On The List for Emails Straight From Our Pro? started up the engine. 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. What must remain foremost in your mind is that the only thing that can cause the idle to increase is additional air getting into the engine. Thank you in advance for your help and providing us rookies with your I called support line he said he would have to look into it and call back. In the wizard I set my Idle to 500RPM but it never got slower than 800RPM, if I run the wizard again and lower to 400 RPM then it never gets lower than 700RPM.After reading about the Idle Speed curver I checked its settings and found that the curve was 300rpm faster at every point over the temp range no matter what temp I had, I adjusted the curve to match what I put in on the wizard and now the RPM is correct, I'd say you have a bug in the wizard.Idle Speed > Idle Speed Curve: Here is where the lack of coolant temperature is going to affect you. This car has never idled under 900 without stalling with 3 carbs and does the same thing with sniper edit. Even 50 RPM can make a difference in how much impact the transition to Drive has on the idling engine's ability to stay at a fixed RPM.I would not recommend it in this situation but anytime a "kick" in idle speed is desired that is easily done by setting the kick value in Tuning > Advanced > Adv. Your comment doesn't imply any sort of problem that would make me give up on idle timing control. (Plus they it just looks way cool in your engine compartment!) 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. Hey Chris We have shipped quite a few of these to customers in Australia and New Zealand so I know that there is becoming a good following there!We recommend this Inline 10-micron fuel filter to prevent problems like that. the issue Due to when the pump i'm using now makes a loud howling noise when it gets ran for awhile and it gets at a 1/4 tank of fuel or less. It really takes a lot of throttle tip-ins before you get anywhere near "learned" in this part of the fuel map.Based on your description, it sounds like you have a lean stumble. 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. This curve runs fom -40 degrees to 260 degrees, and gradually reduces the RPM along that range. Is this an issue to worry about? I'd really appreciate some help. Cycled the ignition off. carburetor setup, but it does blow when I can't jump on the highway like I use It's the same one that Holley puts in their Sniper Master Kits and I've never heard anyone with anything but good things to say about it. To keep it running in gear, I have to bump the neutral idle up just over 1000 RPM. By going into the IAC settings and turning off the Idle Spark control and setting Target Idle to 750 RPM my idle issues are gone, and it now returns to desired idle after cruise. Reply Quote. That is the IAC hold position. This is extremely unreliable afrer warm. Going back to what you said. = 2.34 My guess is a faulty IAC since it is intermittent and I have not done any setup changes. These are "transitional" cells, and you really have to make the effort to learn in these areas of the map. So something is triggering the ECU to be in Open Loop. Unless you have ignition control enabled, that is the only thing it can do to reduce the idle.Realize the only things that can cause the car to idle up as you describe are air and ignition advance. I have quadruple checked my wiring and am certain it's correct. The hold position is part of the response that keeps the car from dying when you come off the throttle. Really appreciate the amount of learning im getting off here. I had a customer who struggled to understand that. Please give this a try and let us know how it works! But I still get the iac at 0 and the rpm at 1200. However, whenever you start changing things, you can get into a chain reaction. Honestly, I've never seen this happen but if the butterflies were misaligned on the shafts it could allow too much air to enter. Then, when you experience the high idle, note if the IAC number has increased. If the issue persists, you may need to replace the IAC. If the screen shows iac at 0 and you block the hole to find it open what does that mean? At low levels RF interference will often reset the ECU so quickly that the engine will not stall. What an amazing site you have here. The Sniper Quick-Start Manual provides the following instructions for setting the idle. I do know that the reference angle is 57.5, the inductive delay says 100.0. I'll have to check again tomorrow. So I had my Idle set up perfect, with idle timing control off and engine hot the IAC was right at 2-4%. Fuel Prime Multiplier is primarily a benefit to throttle-body based EFI systems. I did buy the Sniper from you guys and the service was fantastic. Hot start it most of the time wont start unless I give it a little throttle. check out the. no timing control. I have driven a stand-alone transmission controller for the 4L60E in my (then) Sniper-equipped '95 GMC pickup using the Sniper TPS with complete success. Copyright 2022 Holley Performance Products, Inc. All right reserved. Does this seem reasonable and how hard will it be to get the idle and off-idle performance correct? Confirm the placement of all wiring, ensure that the WBO2 sensor is positioned properly, etc. Fortunately, I have an article that goes into this in some detail. It'll start & run till it's warm, then when I try setting the IAC every time, I try getting it between the 2 & 8% it quits. P.S. :-DStill, I hate to leave someone hanging so I'll try to help. If the minus 40 degree setting is lower than the setting to the right, simply move it up so that it looks something like this: The folks who have tried this have found that their idle speed control behaves much more as they expect. After manually making the sensor go through the full range a few times, I reinstalled it and now my TP will read anywhere from 0% to 4% when I key on. I managed to get the IAC down to around 0% - 8%is this good? Sniper is still learning so it will continue to improve.Second, you may have heard the phrase, "correlation is not causation." Sniper EFI Idle Tuning - Holley Motor Life But if the idle is a little bit higher then it doesn't have to jump quite as much in response to the load, and tends to react a little bit more smoothly. Capability Range: Moderate If not then I think you are going to find that this will solve much of your problem. Check fuel pressure too (. that my Air/Fuel ration was 15:1 and I believe the target is 13.5:1. It could be that you've left a vacuum port unplugged, it could be that the throttle plates are misaligned (unlikely), it could be that your IAC is not closing properly. That is the only way to fly. After it starts it idles around my 960rpm setting + or - 100rpm. But they are 100% committed to your satisfaction. I am right back to where I started. engine works beautiful, the car runs a lot, but suddenly, the engine does that. TPS 0. The second thing to realize is that even after you get it just right, you need to keep an eye on the IAC number and reset the idle if it gets outside the 2-8% range when idling when warm. The noise changes sound with the throttle position. Anyway I have a 327 sbc in a 1987 Monte SS with a T5 5 speed and 3:73 posi rear. The small rubber plug had a leak. It's hard to know what the previous owner did right versus wrong. While this video is not meant for the Sniper EFI user it does provide a great overview of how your ethanol tuning adjustments must be made not only to the base fuel map but to the other configuration settings. If the ECU has not spent some significant time learning yet, I'd recommend going back through the setup wizard and getting everything back to default. The on board fuel pressure regulator in the Sniper throttle body has a small filter clipped over one end . But he kept having problems so eventually he did a complete check and then he found the problem. Or alternator? If you don't have a working coolant temperature sensor then it will never bring the idle speed down. You just need to go back through the IAC adjustment procedure now that idle timing control is enabled. The car cruises fine, and if I was to keep idle at 2000rpm the issue wont happen, its only when the car tries to ramp down to idle position.Thank you for your help, any advice would be appreciated.Thank you,Eric, Whenever we see the AFR go to "Heating" that is an indication that the ECU has been reset. Car was running great initially. Based on your situation above as well as some of other experiences, I recognized that I needed to improve my tuning procedures above to better explain what steps to take if that 10-step process doesn't completely solve the problem. One of the best Ive seen so far. 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. First, let me congratulate you on your patience in letting the system learn. Can the return line be an issue?So far this sounds like an ideal setup.>I have had 2 faulty gpa-4 255 walbro pumps go bad. back to trying to zero down an idle. He has walked me through every question Iv. To be honest, you sound like an ideal candidate for Sniper ECU ignition timing control. I used the Casper's Electronics 108103 splitter and carefully soldered my connections. Can the return line be an issue?I have had 2 faulty gpa-4 255 walbro pumps go bad. You can adjust this number up or down but there is really no need to change it unless the car is stalling.The sucking sound is just what happens when the Sniper EFI System is paired with certain intake manifolds. Though they both are indications of the amount of opening through the throttle body, the TPS is the throttle opening percentage and the IAC number tells us how far the IAC stepper motor is opening the bypass air circuit.If I understand you correctly you are saying that the TPS reads somewhat normally (traveling from 9% to 100% or so) but that when you cycle the key it once again starts at 9%. Interesting situation you have. I've been messing around for a bit trying to eliminate any possible vacuum leaks. Hi Chris. After 50 on the throttle position I'm not sure if the whistle goes away or you just can't here it anymore. A couple of possibilities that come to mind in order of likelihood: Im having an issue with what I think is the Iac. That is not the way to go. Sorry I didn't buy from you but I didn't know you had sold them. In some cases, you may only be able to put as little as 10 RPM between the hard idle and the target idle. Try it! At this time, TPS is 0%, IAC is 50 to 60%. Should i adjust idle screw with the fans already on? Between the kick down and the return springs on the throttle body the pedal is so hard to push it's pretty much a jack rabbit start every time from stop, it's almost undrivable, any suggestions on what I could do?thanks for help, I've tried both Holley's tech lines for close to 2 hours with no answer! Was perfect idle iac reading 3. However based on your reply I connected the Fuel Pressure gauge and your IAC is at zero. Genuine Walbro fuel pumps are virtually bullet-proof. )Then look a the datalog and find out what TPS ROC and MAP ROC is most likely to cause the problem. Could the IAC be broken/malfunctioning? Cl. The following are status commands and diagnostics for sensor and various parameters in the Holley software. I drove it a bunch more yesterday afternoon/evening and the same thing happened several times. The Sniper EFI Manal says not to but many EFI installers have informed me that the transmission only reads the 5V TPS signal from the Sniper EFI & does not draw any power so will not affect the Sniper EFI TPS output. Edit I just ordered a Holley return / regulator and cap for the sniper ouletOh, this is not an OEM Master Kit, but the fuel pump should be the same EFI Pro shipped this kit. 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. Second, Holley just released over the weekend a video on how to implement a flex fuel sensor on their HP and Dominator ECU's.

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