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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
IAC
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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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860 Posts
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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208 Posts
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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Thanks guys. Did y'all have the bucking issue as well or just the surging idle?
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208 Posts
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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208 Posts
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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201 Posts
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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208 Posts
Just get one at the local parts store. Around here i deal with advance. Nothing special.
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Never looked at it that close but im sure it could be a contributing factor.
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1,435 Posts
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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860 Posts
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 :lol:
---------- Post added at 12:17 PM ---------- Previous post was at 12:16 PM ----------
This may have been established, but what's your timing at and what fuel are you using?
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116 Posts
18* and 93
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493 Posts
18 degrees sounds a little too advanced to me. I think you might be pinging out.
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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
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860 Posts
Or time for new harmonic balancer?
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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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