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Old 02-13-2013, 08:18 AM   #1
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IAC

Have any of y'all had problems out of these? I took mine off and cleaned it with carb cleaner and it's still idling rough and surging at cold start. And bucking too. Thanks, KC
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Old 02-13-2013, 08:21 AM   #2
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Well carb cleaner can eat away the varnish in iac's....no clue if that's your issue...i just use maf spray. Worse case scenario the spring and bellow inside it is messed up and youll need to replace it.
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Old 02-13-2013, 08:30 AM   #3
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Dang I wouldn't have used it if I knew that. Some guys off here said they used it on theirs and it fixed the problem. I think it is the problem though it stopped when I first cleaned it but now that it's been a week or so it's acting up again. Weird I know. I got a new maf sensor and everything is fresh including the fuel filter. The only thing I haven't changed is the IAC
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Old 02-13-2013, 02:17 PM   #4
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Dang I wouldn't have used it if I knew that. Some guys off here said they used it on theirs and it fixed the problem. I think it is the problem though it stopped when I first cleaned it but now that it's been a week or so it's acting up again. Weird I know. I got a new maf sensor and everything is fresh including the fuel filter. The only thing I haven't changed is the IAC
Generally speaking I use brake cleaner, IDK what the difference is between that and carb cleaner, there as so many solvents nowadays and no good description of what sets them apart. Even within one manufacturer.
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Old 02-13-2013, 02:46 PM   #5
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Have any of y'all had problems out of these? I took mine off and cleaned it with carb cleaner and it's still idling rough and surging at cold start. And bucking too. Thanks, KC
Sometimes cleaning iac just ain't enough. Just have to break down and buy one. I kept cleaning mine to no avail n had to end up buying one. Problem fixed. Then i would start over with base idle reset and setting the tps. Good luck.
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Old 02-13-2013, 04:21 PM   #6
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Thanks guys. Did y'all have the bucking issue as well or just the surging idle?
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Old 02-13-2013, 04:38 PM   #7
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Thanks guys. Did y'all have the bucking issue as well or just the surging idle?
Just surging idle on mine but it could cause the bucking as well. When things start messing with air/fuel ratio it can cause lots of aggravation and problems. Once u put the new one on then just erase the computer and do the base idle reset and set tps. Good luck.
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Old 02-13-2013, 05:35 PM   #8
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Base idle reset is just leaving negative battery terminal off right? Nothing fancy?
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Old 02-13-2013, 06:50 PM   #9
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Base idle reset is just leaving negative battery terminal off right? Nothing fancy?
It requires a few steps but nothing hard. Look in the stickies section under 5.0 idle adjustment. It has the step by step procedure.
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Old 02-13-2013, 06:55 PM   #10
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It requires a few steps but nothing hard. Look in the stickies section under 5.0 idle adjustment. It has the step by step procedure.
Thanks. Also, what's a good company that makes IAC valves? I've cleaned it enough with no difference in performance just need to buy new.
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Old 02-13-2013, 06:58 PM   #11
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Thanks. Also, what's a good company that makes IAC valves? I've cleaned it enough with no difference in performance just need to buy new.
Just get one at the local parts store. Around here i deal with advance. Nothing special.
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Old 02-15-2013, 10:44 AM   #12
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Will the IAC cause bad fuel mileage? Just wondering cuz I'm having the same problems. Guess ill go buy one -_-
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Old 02-15-2013, 11:09 AM   #13
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Will the IAC cause bad fuel mileage? Just wondering cuz I'm having the same problems. Guess ill go buy one -_-
Never looked at it that close but im sure it could be a contributing factor.
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Old 02-15-2013, 09:31 PM   #14
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I had a similar issue and it turned out to be my spark plug wires , when I installed them I (not realizing) had 2 of my wires laying onto headers which started to burn through the 2 wires and that was cause my car to surge and stall once the car reach operating temp and would now turn on and stay running until temp cooled down enough !!
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Old 02-16-2013, 12:17 PM   #15
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I had a similar issue and it turned out to be my spark plug wires , when I installed them I (not realizing) had 2 of my wires laying onto headers which started to burn through the 2 wires and that was cause my car to surge and stall once the car reach operating temp and would now turn on and stay running until temp cooled down enough !!
The heat and grounded contact makes the charge go through the valve covers ^_^ if you go in the dark (complete or as close as you can get to pitch black) run your car with the hood open, give your eyes a second to adjust and if you have current jumping to other wires or to your engine/Acc's you'll see a blue glow where it occurs, it looks like little lightning but far less dramatic. I like to think of it as my cars neurons firing

---------- Post added at 12:17 PM ---------- Previous post was at 12:16 PM ----------

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Dang I wouldn't have used it if I knew that. Some guys off here said they used it on theirs and it fixed the problem. I think it is the problem though it stopped when I first cleaned it but now that it's been a week or so it's acting up again. Weird I know. I got a new maf sensor and everything is fresh including the fuel filter. The only thing I haven't changed is the IAC
This may have been established, but what's your timing at and what fuel are you using?
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Old 02-18-2013, 07:35 PM   #16
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18* and 93
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Old 02-18-2013, 09:17 PM   #17
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18 degrees sounds a little too advanced to me. I think you might be pinging out.
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Old 02-18-2013, 11:02 PM   #18
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18 degrees sounds a little too advanced to me. I think you might be pinging out.
+1. 14* advanced is generally the max, some people can get away with 15-16* but 18 is definitely too much
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Old 02-19-2013, 12:59 AM   #19
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+1. 14* advanced is generally the max, some people can get away with 15-16* but 18 is definitely too much
Or time for new harmonic balancer?
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Old 02-19-2013, 09:18 AM   #20
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Just changed the IAC on my 94. It now has a miss when I'm driving and idles funny heck it ran better with the old one on it. Suggestions? I already disconnected the negative cable for a little over 45 min then started it back up and still the same problem
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Old 02-19-2013, 09:26 AM   #21
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Just changed the IAC on my 94. It now has a miss when I'm driving and idles funny heck it ran better with the old one on it. Suggestions? I already disconnected the negative cable for a little over 45 min then started it back up and still the same problem
Did you recalibrate the TPS? Have to do this with new IAC. Also clean MAF when you get the chance, could be the problem. Do the base idle reset if you can. A lot of steps but normally pays off.
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Old 02-19-2013, 09:26 AM   #22
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Vac leaks maybe?
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Old 02-19-2013, 10:12 AM   #23
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I def meant to put 16 not 18 sorry. Should I back it off some?
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Old 02-19-2013, 10:13 AM   #24
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Brand new MAF and new vac lines.

Correct me if I'm wrong,
Set TPS to .95
Then disconnect negative cable for 20 or so min
Unplug IAC
Start car and set preferred idle
Shut car off
Plug in IAC and start car and let idle for a couple minutes
And that is all the steps to reset idle??
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Old 02-19-2013, 10:44 AM   #25
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TPS to .98-.99.
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Old 02-20-2013, 01:26 AM   #26
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18* and 93
Is that with or without the spout connector removed? If its removed then that's too much, if its 18 with it still in then it needs to be advanced more.
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Old 02-22-2013, 02:34 PM   #27
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As far as I know it's never been removed. I checked it yesterday it's set at 16* right now.
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