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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Lt1 Revving On Its Own....

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Old Jan 28, 2011 | 10:15 PM
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Default Lt1 Revving On Its Own....
just made an account, but been reading forum for awhile. i have a 94 z28 A4. my engine revs on its own. i kno it sounds dumb but it does. i cant figure out why either and was hoping someone on here could help me out. i took this vid with my cell phone while i was a stop light. usually does this after i been driving it for bit. any help is appreciated. THANKS....

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Old Jan 28, 2011 | 11:00 PM
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My buddies mustang used to do that but it rev all the way to 1500. It was the IAC.
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Old Jan 29, 2011 | 01:04 AM
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Could be the coolant temp sensor in the water pump.
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Old Jan 29, 2011 | 03:42 AM
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@iron: yea mine hits 1500 also, and I changed the IAC valve. I didn't put a gasket on it cuz the Instructions said it had a one built into it. I was kinda iffy about that but I installed it anyways, could that be it to?
@henry: ok I'll have to check that out.
Thanks for the advice ....
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Old Jan 29, 2011 | 06:01 AM
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sorry to hijack.
Mine does the same when you pump the breaks while its in park. and one ever had that problem??
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Old Jan 29, 2011 | 07:16 AM
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Originally Posted by LT1John
sorry to hijack.
Mine does the same when you pump the breaks while its in park. and one ever had that problem??
that sounds like a vacuum leak

same with the OP or a bad IAC valve
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Old Jan 29, 2011 | 09:06 AM
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@lt1john: it's Coo man, no worries....
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Old Jan 29, 2011 | 09:26 AM
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haha mine revs when I shake the power mirror switch really fast!
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Old Jan 29, 2011 | 10:39 AM
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Did you clean the IAC passages? If not,take off the TB and clean it. I would also clean the MAF and check vacuum lines.
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Old Jan 29, 2011 | 10:43 AM
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IAC or vacuum leak may be your issue. also as a note. your oil pressure is Low!
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Old Jan 29, 2011 | 10:45 AM
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Originally Posted by pboxfun
haha mine revs when I shake the power mirror switch really fast!
lol wut
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Old Jan 29, 2011 | 11:53 PM
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couldn't also be the tps? My old foxbody did that it was a little more of a surging rev then this but mine was tps.
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Old Jan 30, 2011 | 01:44 AM
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vac leak is my guess
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Old Jan 30, 2011 | 03:10 AM
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Thanks everybody for help, on my next 2 days I will start checking all these things....
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