engine revs up when at a complete stop
Thread Starter
Teching In
Joined: Oct 2005
Posts: 17
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engine revs up when at a complete stop i have a 94 z28 camaro with about 187xxx miles on it. when the engine is warm it starts to rev up on its own when im at a complete stop. when i have it in neutral it dosn't do it as much. i've already changed out the fuel filter and checked the fuel presure and everything was fine, i also changed out the PCM, and its still doing it. i also changed out all spark plugs and wires. i was wondering if anyone had any clue what might be the problem. thanks alot.
TECH Apprentice
Joined: Mar 2005
Posts: 394
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From: Beaumont, California (So Cal)
Before you get into your opti can all of the vacume lines for vacume leakes, my pcv valve line that went from the valve cover to the TB had a leak and it caused my car to idle higher like you described.
TECH Apprentice
Joined: Mar 2005
Posts: 394
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From: Beaumont, California (So Cal)
just check all of the hoses, and all of the lines that are hooked into the intake manifold. I had to replace my pcv hose, and my air pump hose also got a hole burned into it (thanks shorty headers ) and that one caused an echaust leak. check the IAT and the intake elbow for any holes or tears that could be causing any potential problems as well..... i hope some of that helps ya
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Thread Starter
Teching In
Joined: Oct 2005
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well i checked my hoses, and the pcv hose was cracked. i went down to auto zone but they told me that i can only get it thoguth the dealership. how much does it cost and how long might it take to get it. hopefulyl this fixes my problem>
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On The Tree
Joined: Feb 2005
Posts: 107
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From: Haughton Louisiana
hey there sir, when i got my motor rebuilt it did the same thing upon fire up at the machine shop and it cost me like 100, 45 part i think and labor it was my idle air control valve thats what mine needed
TECH Enthusiast
Joined: Jul 2003
Posts: 697
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From: Evansville, IN
With that many miles, you might just need to clean your IAC valve.
IAC = Idle Air Control
It is what the PCM uses to control the rpm at idle. It might be sticking on ya. It is mounted under the throttle body.
IAC = Idle Air Control
It is what the PCM uses to control the rpm at idle. It might be sticking on ya. It is mounted under the throttle body.
Thread Starter
Teching In
Joined: Oct 2005
Posts: 17
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i do i clean it out though, and also how would i know if i would have to replace it. i hope thats the problem casu ei already took it to a mech and they charged me 800 and didnt do a damn thing exept change out my PCM...thanks for the help though
TECH Apprentice
Joined: Mar 2005
Posts: 394
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From: Beaumont, California (So Cal)
Originally Posted by xplod_69
well i checked my hoses, and the pcv hose was cracked. i went down to auto zone but they told me that i can only get it thoguth the dealership. how much does it cost and how long might it take to get it. hopefulyl this fixes my problem>
