BigEz209

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....

IronOutlaw

iTrader: (4)

My buddies mustang used to do that but it rev all the way to 1500. It was the IAC.

henry172

iTrader: (2)

Could be the coolant temp sensor in the water pump.

BigEz209

@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 ....

LT1John

sorry to hijack.
Mine does the same when you pump the breaks while its in park. and one ever had that problem??

myltwon

iTrader: (1)

that sounds like a vacuum leak

same with the OP or a bad IAC valve

BigEz209

@lt1john: it's Coo man, no worries....

pboxfun

iTrader: (2)

haha mine revs when I shake the power mirror switch really fast!

3 pedal SS

iTrader: (1)

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.

SoxXpupPeT

iTrader: (34)

IAC or vacuum leak may be your issue. also as a note. your oil pressure is Low!

whytryz28

iTrader: (28)

lol wut

BigD383lt1

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.

tricked94camaro

iTrader: (1)

vac leak is my guess

BigEz209

Thanks everybody for help, on my next 2 days I will start checking all these things....