34K views 1 year ago Holley Sniper How to Set The IAC Idle air Control in 5 minutes or less. 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. Was perfect idle iac reading 3. That is the first thing you must find. It's all part of the adventure! Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Idle : IAC Rampdown : IAC hold positionChange this by maybe 2% in either direction. From herethe cycle continues and I am So the issue Im having is low idle. The tps will not auto reset to zero. 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. That is a good thing.I don't have a specific target RPM but always encourage automatic transmission users to bias the idle just a tiny bit higher than what you might otherwise. It may take a few tries. (Grease can sometimes do the same thing as a more permanent gasket sealer without making the removal of the air cleaner such a pain.). There is a chance that the IAC is open but displaying 0% so start by putting your finger over the IAC opening. 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. You advise would be greatly appreciated. This minimizes installation time and packages really well on a diverse group of engine applications. That disappears as soon as the throttle is pressed and then you immediately revert to your timing table.You can certainly use the compressor to initate the IAC Kick, but remember that this is just a temporary idle boost to ensure that the engine doesn't die when the AC is first turned on. I'm running a 408 sbc. I presume your idle speed table doesn't increase at 200 degrees? I installed Holley Sniper on three other Mavericks here in Brazil and the problem also exists.I did not make any changes to the parameters, only on Target AFR and the correction on the Idle Speed Curve chart. Realize that when you drop the throttle, the engine enters a condition it will only see for a fraction of a second at a time. That could be a problem with the TPS or it could be some sort of throttle linkage issue. Also if I give it a Really appreciate the amount of learning im getting off here. 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. Ive had an idle at neutral as high as 2400 rpm. I have replaced the IAC motor and the problem remains. 680-700.I can't find any reason other than it looses where it is in the firmware with The idle is 1350-1400 with the idle screw at initial contact. All times are GMT-6. If I put the vehicle in gear the idle gets higher with temp. Do please let us know what you find out! The problem I'm having is I cant get the IAC to drop down off 100%. I pulled over and turned the car off and then back on. The IAC should display a 2-8% to bring the idle up to the actual target. 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. Check the Distributor Tach Connection to the EFI. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. 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. I have driven it a few times maybe 100 miles or so. 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. Holley will take a look and tell you you have RFI and wish you good luck in finding it. I believe because the TPS is not registering. If you remove the air cleaner entirely and the whistle continues then you can rule that out. I have not heard of this. The "Gauge Text" is what would be shown on a 2-1/16 gauge or the Avenger handheld display. I followed the instructions and set the IAC to 2-9% when warm with idle at 850 RPM. This is more of a bit of a reality check. Then your low idle problem will go away. However, I did have another fellow who contacted me that claims he went through three units before he could get one that would talk between the ECU and the Monitor. Super helpful and knowledgeable. I have a bone stock 350 that I installed a Sniper on and had the same whistle noise, presumably from air going past the butterflies. I believe that for the HyperSpark the Reference Angle should be 57.5. issue. I appreciate the help youve given to everyone as it continually helps me! your IAC is at zero. I am having an idle issue (other than that is absolutely perfect). But they are 100% committed to your satisfaction. Intermittent stalling usually points to radio frequency or electro-magnetic intereference (RFI/EMI). And the only way to be positive about that is with a gauge.Unfortunately, the Sniper does not provide an input for an electronic sender so the next best thing is an analog gauge. Hello Chris. While it is not mandatory, I recommend the Sniper EFI CAN-to-USB Adapter to move the data between your Sniper EFI and your PC rather than trying to do this via the SD card. Hi Chris, I have a lean stumble on throttle tip in 2-3% tps taking off from a stop light the afr will go to 19afr and the engine will stumble for a split second. Well, it sounds to me like your Sniper is doing its best to reduce your idle. See these. Please let us know how this works out for you! I straightened that out, got it running and that's where it goes downhill. Featured Products Sniper EFI $7.07 - $2,457.95 470 Products View Parts author Staff Writer 1711 Posts An Article About Video tech Sniper EFI Videos Sniper EFI Tech Sniper EFI sniper Installation It only comes back to normal if I turn the engine off and on again. The Sniper EFI replacement throttle body for Autolite 1100 carburetors will be right at home on most early in-line 6 cylinder powered grocery getters or weekend cruisers. The ticking is inline with the fuel pressure I feel squeezing both the fuel return & delivery lines (like a heartbeat). check out the. At 0% it shouldn't be sucking any air through that port, correct? It wont fire up. I've changed all the After doing TPS reset it starts fine but when you give it some gas it hangs at 1500 and will not return to idle. But if you will just advance the timing at idle and see if it makes a difference then that will tell you what you need to know. When I put it in gear, it drops so low that it will stall if I don't add throttle. If you do find you have RFI issues then I've written an . The IAC going to 30 is normal. Please give this a try and let us know how it works! I'm thinking it could be the fuel pressure--- since I have a new Spectra EFI tank and there's been some reports of the interior coating coming off and gumming up the pump however the sniper display DOES NOT show fuel pressure.the Sniper DOES measure fuel pressure on its own - i've confirmed that with holley techs as they told me to purchase the fuel pressure gauge that can just hook up to the 1 wire gauge harness from the Sniper. In some cases, you may only be able to put as little as 10 RPM between the hard idle and the target idle. However, I always preach to never touch any of the controls on the handheld until you have a couple hundred miles on the engine in a range of driving situations. The distributor was loose. If the vendor from whom you bought the system is coming up blank on ideas then don't hesitate to contact Holley's outstanding tech support department directly at 866-464-6553. When I start the motor I have to push on the accelerator pedal for the motor to start. 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. It turns out that some of the Snipers are shipping with the minus 40-degree setting drastically lower, as shown in the following image. For the first couple of drives it was running well, Sniper EFI was working exactly as advertised. Hey Tommy, we've got at least one thing in common. I do know that the reference angle is 57.5, the inductive delay says 100.0. TPS 0. If this is the case then I would look particularly close at the IAC hold position and IAC ramp start.Let us know what you find and what works for you! What might cause the TPS to go to 2%? I keep wondering how it was running so good with 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. Seems like its too slow to grab idle when ac kicks on. They are prone to be inaccurate. My problem is low idle. About two minutes after I get it set at 850 & 5%, it has progressed to 100%. The timing can drift 0-30 degrees just due to the width of the rotor tip. I have never seen issue when CTS is below 120 degrees. Hey Chris, I installed a Holley sniper on a small block 400, first start was great! That is certainly not normal! Capability Range: Professional Confirm the placement of all wiring, ensure that the WBO2 sensor is positioned properly, etc. I watched the butterflies start to open at about 35 on TPS. The Sniper will be controlling the timing so it will be based on a multitude of factors. Everything was working perfectly and I shut off the engine. Definitely not 90. Some suggestions: i did have the same problem.try lengthening the lever of the throttle.meaning the length from the center of the throttle to the point where you attach your cable or your rod from the peddle. (Don't drive and watch--get a helper!) Across the board, all of our customers say how impressed they were that it started and ran right out of the box just by following the simple installation instructions. Once you've done this, the next natural step is to transfer the learn table to the base map, then go in and smooth out the sharp edges, which are going to be at these transitional states. I tried adjusting my IAC up to 10deg in both directions with no change. I'm happy to walk you through what is required. If But before you adjust the ECU to lean the idle out, first confirm that your fuel pressure is right. I'm new to the efi thing and any help would be seriously appreciated. Your mechanical advance will naturally change the timing a bit but it should be fairly close. In your case, however, I think you're close to getting it running. I would disregard any correlation between idle control between the Stock and Street/Strip setups. I will turn it up some. Your closed loop compensation is adding a full 50% fuel. 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. Idle quality is great, RPM is good, sometimes IAC is now between 2 and 5 exactly where it should be. I'd recommend you contact Holley Tech support to get their input (1-866-464-6553; call early for the shortest wait times.) However based on your reply I connected the Fuel Pressure gauge and 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. So I had my Idle set up perfect, with idle timing control off and engine hot the IAC was right at 2-4%. Then Friday night as I was driving home, the car started acting up. 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. In the warm state IAC adjusted to a position of 2 to 10%. Well, it turns out that with the current firmware this throws the IAC control into a bit of confusion. The Sniper resets the TPS to 0% each time that you key the system on. All times are GMT-6. It didnt do this with the carb on it. 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! 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! when things aren't working and this provides just that. They also recommended that their ground be spliced into the Sniper ground as close to the Sniper as possible. Genuine Walbro fuel pumps are virtually bullet-proof. When stopping, the brakes are unable to overcome the engine so I go to neutral just to stop fighting the engine. It will still change a bit with weather changes and when you get into infrequently-used sections of the map, but it's nothing to worry about.Regarding your idle speed immediately after start-up, that is determined by your Idle Parked Position. When this occurs, I sometimes can shut it down and it will return to the correct settiings. This is very disappointing as people love to hear the motor while the hood is open.Thanks Jon. If it is already adding fuel, it may be worth expanding this into the area where the tip-in is occuring (and where there is no learning occuring. Does anyone have photos of this additional return spring they installed? I have probably 200 - 300 miles on this engine and it has always done this. mail today. Hi Chris. 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. I've been having problems with my sniper efi just shutting off. Bolt-on carburetor style EFI for your classic car or truck. So glad this was helpful. If your RPM is 2000, your TPS is 0, and your IAC is not closing, then there is some problem. Overview. check, I guess after reading everyone saying how great the system is after So this is my issue ( I did just email Holly). Don't be surprised if one or the other is slightly open. Data logs show no EMI/RFI. Learning to install these is great--you're about to embark on the next great adventure of advanced troubleshooting. *Possible delays due to Covid-19 click for more information. Using the handheld, navigate to Tuning > Basic > Basic Idle and ensure your target idle speed is set to the RPM you desire. itself out and hold idleeventually stalling. I recently bought the car with the EFI system on it. 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. About two minutes after I get it set at 850 & 5%, it has progressed to 100%. I can adjust at 160deg, but my fans turn on at 180deg. Usually it wont stay on 0% very long and soon changes to another number like 1 or 2%. Keep in mind that at 60 miles the Hello Chris. Get On The List for Emails Straight From Our Pro? I was looking at a data log from my truck earlier this week and noted that at idle my IAC was zero. I had a customer who struggled to understand that. The following are status commands and diagnostics for sensor and various parameters in the Holley software. I installed my Sniper and the engine fired up great. Thanks, That is an strange situation. You can drop it down and you will find it will behave more like you expect. it seems to ramp to 60 psi on the initial prime, but as soon as the motor start the psi spikes.I guess a workaround would be an inline return/filter regulator? Should the iac% fluctuate? Then do it just a bit faster--just enough for it to bog a bit. Both Sniper and trans controller grounds were direct to the battery ground, as they should be. 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. When the lambda is 1.0, the displayed AFR is 14.7;1 REGARDLESS OF THE FUEL. Bryan McTaggart 02/28/2023 news 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. I' m going to put the 3 rd new pump this coming friday. 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!) It is simply for the benefit of the user. An undersized or partially plugged fuel filter is a classic EFI installation mistake. He said they have been having an issue with these lately. The engine might run hot but if the timing is right it should keep that heat in the engine--which is where the damage turns up. NOTE: Do not attempt to set the target idle speed and IAC position until the engine is above 160F! 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. Thank you for this guide on setting IAC. This may sound crazy but I'm going to jump out on a limb here and say you don't have an idle issue--you have a timing issue. Relatively new Sniper EFI install on a '69 Mustang 302. This is a mighty big subject for a blog post reply, I should probably start doing some videos on this. any ideas? 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. Sniper EFI offers superior throttle response and wide-open throttle power. Holley have given a new unit. These problems will go away when you do that. The broad consensus has been that the Sniper is an amazingly straight-forward install and starts and tunes as expected. Drive great and idles perfect at stop signs. The throttle plates are misaligned. I have a set of 8.8 Accel Rfi suppression wires on it. What would cause the idle to faulter like that? The fix? If the screen shows iac at 0 and you block the hole to find it open what does that mean? That, I am afraid, is going to involve a little bit of luck if you don't want to create a 250 MB data log. Am I missing something. Follow this link to download it for free if you have not already done so. Some have suggested the gasket might cause it but I've never heard of anyone fixing the whistle by adjusting the gasket (and many have tried. The person I bought it from said he never could get it to run for more than a few seconds. Purists will sniff that these are not accurate to the tenth of a PSI. Your second problem should be a bit more concerning. If you set the RPM above idle to start ramp too high, then it may not ever get down to the RPM above idle to re-enable. Make sure that your blanking level is _below_ that (being careful not to find yourself in the situation I describe above.)
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