sloick Posted August 23, 2009 Report Share Posted August 23, 2009 My Z34 starts and runs fine. idle at start up is normal, about 800-850 i guess. after being driven for a few minutes the idle jumps to 3000rpm if i shut it off and turn it back on while rolling 8 time out of 10 it idles fine again untill being driven again. any guesses before i find out for sure? vacuum lines, iac, tps? i really hope its not the lower intake gaskets. i dont know because it idles fine after being shut off, and no codes yet. do the heads need to come off to change the lim's? Quote Link to comment Share on other sites More sharing options...
BXX Posted August 23, 2009 Report Share Posted August 23, 2009 Sounds like the IAC is sticking or bad.. Quote Link to comment Share on other sites More sharing options...
GOT2B GM Posted August 23, 2009 Report Share Posted August 23, 2009 Something obscure but also a possibility is a defective power steering "idle up" switch on the rack. Happened on my old white 93 Z. Quote Link to comment Share on other sites More sharing options...
Andrew Posted August 24, 2009 Report Share Posted August 24, 2009 its not the LIM's. those are worse when cold. and for the record, the heads do NOT have to come off for them to be replaced. the procedure is really quite easy. Quote Link to comment Share on other sites More sharing options...
AL Posted August 24, 2009 Report Share Posted August 24, 2009 Check your vacuum lines... Mine did this and the vacuum T by the rear spark plug (closest to drivers side) was loose Quote Link to comment Share on other sites More sharing options...
sloick Posted August 24, 2009 Author Report Share Posted August 24, 2009 iac came out looking like this. the other part was still in the hole but it was still hot so it fell into the great abyss known as a 3.4 junkyard trip tomorrow. Quote Link to comment Share on other sites More sharing options...
White93z34 Posted August 24, 2009 Report Share Posted August 24, 2009 just so long as the top of it did not fall into the engine... Quote Link to comment Share on other sites More sharing options...
sloick Posted August 24, 2009 Author Report Share Posted August 24, 2009 just so long as the top of it did not fall into the engine... that would have sucked. it went behind the motor somewhere. Quote Link to comment Share on other sites More sharing options...
BXX Posted August 24, 2009 Report Share Posted August 24, 2009 I Win!! Quote Link to comment Share on other sites More sharing options...
sloick Posted August 24, 2009 Author Report Share Posted August 24, 2009 I Win!! Quote Link to comment Share on other sites More sharing options...
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