holley sniper efi iac problemsthe elements of jewelry readworks answer key pdf

However, I have never found that to be the case. I have a Holley Sniper for almost 11 month now and it was running fine with no problems until now. 2. I have driven it a few times maybe 100 miles or so. (Note: in the original version of this post we had a section about checking the idle speed curve setting. Sniper EFI Idle Tuning. I would not expect that an electric fan would create a noticeable load on the engine but if it did then you'd want to set the idle screw when the fan was not running. (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. All of the wiring exits below the rear fuel injector cover, for a completely stealth installation. 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 Sniper EFI remote IAC (Idle Air Control) and plug is designed to gain installation clearance on some Sniper EFI 2x4 installations. This is more of a bit of a reality check. It has a lightweight centrifugal spring kit installed so I reach total timing around 2500 rpm. Sometimes an engine can produce enough vacuum to pull the secondaries open slightly. They tell you to ask call Holley. One of them might be faulty. = 2.34 you have it set. installing and cruising down the highway 70 mph I just wonder if all I have to do The IAC going to 30 is normal. When the secondary throttle blades are centered in their bores and pivot freely, an additional return spring is not necessary. It does this with the engine off. If your mixture is too rich, it means there's too much fuel and not enough air. I tried adjusting my IAC up to 10deg in both directions with no change. When you key on, you will hear three distinct sounds: The ECU initializing the IAC, the fuel pump priming, and the injectors firing their prime shot. If your TPS is at zero and your IAC is at some random number above 8% (but not exactly 30%) then for some reason your engine has not met the conditions to ramp down to target idle. 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? Bolt on 4150 Flange Carburetor Replacement. At some point you come upon problems that evade the easy answers and this is a good example. https://www.gmperformancemotor.com/parts/19210007.html, http://forums.holley.com/showthread.3128#post83128, If this is your first visit, be sure to I will be at a red light trying to brake against the engine. As I have it set right now, my idle at park is in the high 700s and my desired idle in gear is set at about 700 cold (80 degrees) and gradually lowers to 590 once engine temp reaches 160 degrees. Thanks so much for reading! Possibly cap, rotor, coil? Then follow all of the instructions above, including confirming the idle speed curve setting at -40 degress as well as following my 10-step process for setting the idle. Thank you for this guide on setting IAC. Jun 12, 2021. I'll give the ". No matter what do, my idle will not drop below 1350-1400 RPM when the engine warms. And since they really had an insanely-tight monetary and real estate budget in the Sniper EFI System, it is unlikely that the added something that wasn't absolutely necessary--and then forgot to use it..And you are spot on about the little Earl's gauge with optional -6 AN port. Generally, one of two things: a stuck throttle or noise on the TPS signal. mail today. Turned it off and on again. This was an issue in the earliest version of the Sniper firmware. Your suggestion to remove the PCV valve is just for diagnosis purposes, right? Yes, you are correct. :-) Just don't let the parts go flying. Idle quality is great, RPM is good, sometimes IAC is jumping around from 35 to 60. 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. When I covered the IAC with my finger, the RPM dropped so low it stalled. This is actually more troubling than the sound you originally described. I received from the controller manufacturer greatly understates (at best) the repeated failures of others I know personally who have tried and failed. IAC Creeps To 100% - Holley Performance Products Forums If I read it correctly, the solution from the other thread seemed to fix a constant 300 or so RPM increase. About two minutes after I get it set at 850 & 5%, it has progressed to 100%. Not good.There isn't set solution here that works for all engines. 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! A couple of those and you should feel it getting better. Are these compatible enough? Well, it turns out that with the current firmware this throws the IAC control into a bit of confusion. How to replace the IAC in the Holley Super Sniper. - YouTube Idle quality is great, RPM is good, sometimes IAC is now between 2 and 5 exactly where it should be. Seems to behave more better now. 63 bomb In most cases the IAC (Idle Air Control) circuit is the source of the whistle. Its on a big block Mopar with stock electronic ignition . I am extremely suspect of what you were told about the Sniper ECU monitoring fuel pressure, for several reasons. EFI parts, including the throttle body, and the problem persists.Please give me a hand. I have not heard of this. I notice at 2-3% tps the iac is 18-25% and it stumbles, when the iac gets to my hold position of 30 it stops. I've tried repeatedly re-creating the scenario in hopes that the E.C.M. We have never had that problem with any of the units that we have shipped. 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. That is the only way to fly. I am right back to where I started. That changes almost instantly as the engine revs.Since the learning algorithm requires some time exposure to a certain condition to make larger changes, that half-second makes only the smallest impact. Sniper setting is Stock camshaft. You might even want to add our 4-foot extension harness that will allow you to connect/disconnect the display or CAN-to-USB adapter from inside the car (rather than trying to do that leaning over the engine and under the breather. My problem is low idle. This page was generated at 12:25 AM. Holley Sniper EFI 543-122 Sniper EFI Remote IAC Kit :-). Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Perfectif you have the original synchronous linkage. I recently detached the TP sensor from the side of the sniper to physically move it and it still would struggle to get to 0%. Idle quality is great, RPM is good, sometimes IAC is now between 2 and 5 exactly where it should be. Strangely, what I've seen is that it idles too lean as the injectors are effectively shut off.Thanks again for the follow-up and glad to hear that everything is working well now. If I try and get the 2-10% i get all the way up to 1200 rpm. It could be a couple of things. Cheers Darren. 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. The broad consensus has been that the Sniper is an amazingly straight-forward install and starts and tunes as expected. 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. ?I never had my Carb Cold start RPM any higher then 1600 RPM.THANK YOU. Several good bits here. This question is really outside both the scope of what we try to discuss in the comments section as well as the overall subject of this article. Either the Walbro pumps you are getting are not genuine (lots of forgeries being sold) or else you have something that is killing them. 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. It's a Chevy 350 bored .030" over it has a cam in it what I was told is the cam has the firing order swapped. How can I adjust the startup speed down to about 1400 RPM? Well you were right air was entering from another source. Great work, expert! During after-start idle, the idle will jump up to about 70% if the engine is cold, stay there about 4 seconds and then ramp down to the target idle speed for the current engine temperature. Any ideas here? I straightened that out, got it running and that's where it goes downhill. Those little 1/8 NPT gauges are pretty inexpensive and generally pretty easy to find locally.If you confirm that the pressure is indeed 90 PSI you could pull the fuel pressure regulator apart and check it. With the vehicle in neutral, adjust the idle screw until the IAC Position reads between 2 and 10%. This item: Holley - 543-105 EFI Idle Air Control Motor , Black $71.72 Holley Sniper EFI 870001 Throttle Position Sensor $34.60 Holley 860004-1 92MM Sniper Throttle BDY $223.93 Customers who viewed this item also viewed Page 1 of 1 Start over Holley EFI Idle Air Control (Iac) Valve Motor 30 13 offers from $79.56 Don't know if I should put this in a separate post. Engine Startup Tuning for Sniper and Terminator X Stealth Owners While adjusting the screw if the TPS position reads begins to read higher than 0% cycling the ignition switch will recalibrate the TPS back to zero. Data logs show no EMI/RFI. Holley Sniper EFI Troubleshooting Mudford Garage 8.6K subscribers 38K views 3 years ago My Bronco with Holley Sniper EFI was running poorly. The timing can drift 0-30 degrees just due to the width of the rotor tip. Does this seem reasonable and how hard will it be to get the idle and off-idle performance correct? I recently bought the car with the EFI system on it. :-). That is not something I'd ignore. In that case, and if you have an EGR valve, I might be suspicious of something going on there. The last 2 times have been shorter and one time the high idle was around 1400, this time around 1100. But, if the idle is so high that it is making you crazy then you might try dropping that number just a bit. the gas it catches itself and runs fine at slower speeds. There's a procedure there I can share with you if you'd like.. Were the additional load a simple step function it would be challenge enough for the ECU to gracefully increase the engine speed without overshooting. It might be necessary to insulate or re-route your fuel lines if this can't be solved any other way. If that happens then follow my 10-step process shown above. :-). Check the Distributor Tach Connection to the EFI. Why is this? Turn the idle speed screw on the primaries in about 2-3 turns after it makes contact with the linkage and starts opening the primary throttle blades. And the rather cavalier "Absolutely!" I figured out I was going the wrong direction when I was messing with the AFR programming. What I can't explain is why your TPS is acting so randomly. If not then I think you are going to find that this will solve much of your problem. Is there any chance that your timing has changed since you installed your Sniper? A problem since day 1 - YouTube Leave a comment if you've had this issue and how you resolved. It will drop down to 400 RPM then climb 500 and then shoot to 900 and then come back sometimes two or three times then catch it self an idle just fine again. Holley Sniper EFI Self-Tuning Master Kit - Black Ceramic Finish I have certainly seen this before on other fuel injected vehicles when hot. I did buy the Sniper from you guys and the service was fantastic. The hold position is part of the response that keeps the car from dying when you come off the throttle. The Sniper resets the TPS to 0% each time that you key the system on. I got it home, checked it all over, everything is hooked up correctly. The 10 step set up on your page set my idle perfect and iac perfect a very consitant 700. Target AFR, A / F = 13.5 I installed another return spring for the rear plates problem solved instantly. When I am coming to a stop, the rpms will hang at 1200-1500 rpms. Two months fighting, cursing, not getting any help from Holley OR the forum, and a stupid little tin plate. If it creates an issue (not normally the case) then you'll know. There's nothing wrong with manual tuning, but at this point that is just compensating for an inadequate fuel map. The tps has slotted holes, can you adjust it to get to zero? Then you can take a close look at the IAC and see if it is opening. Hello Chris. Then why don't you Get On The List for Emails Straight From Our Pro? You've got it running and warmed up but now you need to set. Running the vacuum advance and of course I time it disconnected. hard start about 1/2 throttle from stop it bogs down after 3 or 4 seconds.What I TPS 0. I have it set at 650 and it idles anywhere from 590 to 700. Plus, you can email that file to me and I can be of more help. Ilike a few othersam having idle issues. The latest was changing the power brake booster.Today I drove it to work and no issues at all. If it is then something is commanding the ECU to open the IAC. 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. We will definitely be sticking with Holley from here on out for future retro-fits. It will learn the fueling eventually either way, it's just that one might get you there a little faster.If the idle is fine at start-up but then increases after you depress the throttle then you might need to lower your IAC Hold Position a bit. close to idle with the IAC between 2% & 12%. Do I have to hook up sniper ac wire to relay or should iac pick up idle? The throttle position should be zero. To finish, I rather tightly twisted the TPS signal and ground wires all the way from the controller to the Sniper TPS and very carefully routed them away from sources of RFI. have noticed on the hand held is that Air/fuel Ratio rises to 20 +/- A/F and the Simply use your handheld controller and go to the Tuning > Advanced > Advanced Idle > Idle Speed screen and click on the Idle Speed Curve function. When stopping, the brakes are unable to overcome the engine so I go to neutral just to stop fighting the engine. 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. If you have performed the adjustments above and still have RPM issues, it's time to look for clues. After this whole process, the car normally rotates without a very abrupt pedal. I readjusted my IAC, now it's perfect. I have heard some guys complain that the idle is too good and they can't hear their cam anymore I'm kind of like that. TPS% = 1 Overview. Confirm the placement of all wiring, ensure that the WBO2 sensor is positioned properly, etc. I have now determined with the TPS the noise correlates with the opening of the secondary butterflies. The problem was RF interferance . It meets the target idle perfectly in either but if I lightly stab the throttle it tries to stall after slightly revving. If you hit the gas it pops & backfires through the throttle body. I'm Having trouble with the Sniper on high Idle. If more info is needed just ask. I keep doing that with the same result. The small rubber plug had a leak. Hey Chris, I installed a Holley sniper on a small block 400, first start was great! As far as the timing light, I don't know, because I was having problems getting it to work, and that's where I stopped. I, too, wish you'd bought your Sniper from us! You are looking in the right area but I would probably not change the ROC blanking. I did check for the lightning under the hood but all was well. If your fuel pressure regulator has failed (and they often fail by blocking return fuel and maxing your fuel pressure) then it could lead to rich idle, particularly until your engine gets up to temp. I have driven car about 200 miles. You may have to register before you can post: click the register link above to proceed. What might cause the TPS to go to 2%? Does that make sense to you? I managed to get the IAC down to around 0% - 8%is this good? It's all part of the adventure! Ensure all your sensors are displaying proper values. We do that but most places don't. And Earl's makes a fantastic little 100 PSI gauge. IAC Calibration / Hanging rpms | Team Chevelle I also noted that after some time, I could change those values as I saw fit. Thanks for your very detailed question! Sniper is still learning so it will continue to improve.Second, you may have heard the phrase, "correlation is not causation." Inj. The engine makes very low vacuum at idle. Your second problem should be a bit more concerning. (Don't drive and watch--get a helper!) To start viewing messages, select the forum that you want to visit from the selection below. any ideas? First, recognize that the IAC and the TPS are not inter-related in any way. Any idea's? I hope everyone enjoys this v. An undersized or partially plugged fuel filter is a classic EFI installation mistake. If either of these is not the case it must be remedied.After you have done this then you might want to involve Holley Tech Support about the TPS, or it may be easier/faster just to visit the local auto parts store and pick up a new TPS and install it. What is it supppse to be at idle and while driving under heavy acceleration? Watch videos on installation hints and if you haven't yet, download & read every Sniper installation guide you can find online. But I think it is safe to say that you are now at a point were some manual tuning is a good idea. 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? Shutoff engine wait 30 seconds, turn key wait for display to come up, start engine. Everything was working perfectly and I shut off the engine. The idle will not return to the set value.The second issue is the same as the first but the motor will stall out. Car has run perfect every time and has never hesitated or stalled since.

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