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Car Forum / Pontiac / Pontiac Fiero / February 2006Very High Idle Speed
My son's (a senior in high school) 1986 GT is idling very fast. For quite some time it has idled at about 1500 RPM, but last week it started idling at about 3500 RPM. Any suggestions on what might be causing the trouble? Jeff > My son's (a senior in high school) 1986 GT is idling very fast. For quite > some time it has idled at about 1500 RPM, but last week it started idling at > about 3500 RPM. Any suggestions on what might be causing the trouble? > > Jeff First thing is to check for vaccum leaks - one common place is the EGR tube, it has a tendency to crack. > > My son's (a senior in high school) 1986 GT is idling very fast. For quite > > some time it has idled at about 1500 RPM, but last week it started idling at [quoted text clipped - 4 lines] > First thing is to check for vaccum leaks - one common place is the EGR > tube, it has a tendency to crack. More specifically, it normally cracks at the last corrugation before the flange end under the intake manifold. With an idle that fast it usually means that it's completely broken all the way through. Pull the fabric blanket back from the manifold end and inspect, you'll probably have to remove the distributor cap to get better access. JazzMan  Signature********************************************************** Please reply to jsavage"at"airmail.net. Curse those darned bulk e-mailers! ********************************************************** "Rats and roaches live by competition under the laws of supply and demand. It is the privilege of human beings to live under the laws of justice and mercy." - Wendell Berry ********************************************************** JazzMan, We looked around for vacuum leaks before and did not see anything obvious. My son could live with a slightly high idle speed, but 3,500 RPM is no good. It is really cold here now, but hopefully it is going to warm up enough this week so that we can work on it. I appreciate your advice. Jeff >> > My son's (a senior in high school) 1986 GT is idling very fast. For >> > quite [quoted text clipped - 15 lines] > > JazzMan >We looked around for vacuum leaks before and did not see anything obvious. >My son could live with a slightly high idle speed, but 3,500 RPM is no good. >It is really cold here now, but hopefully it is going to warm up enough this >week so that we can work on it. I appreciate your advice. You didn't mention if the engine is a 4 or 6. No one mentioned that if it's a 4, the idle speed solenoid in the throttle body may be the culprit. Or did I miss something ? Pete >>We looked around for vacuum leaks before and did not see anything obvious. >>My son could live with a slightly high idle speed, but 3,500 RPM is no good. [quoted text clipped - 6 lines] > > Pete He said that it was an 86 GT, and all GTs are v-6. I also agree the most likly culprit is the egr tube. Problably completely broken off under the trotle body. Signature======================================== Todd Zuercher mailto:tzuercher@earthlink.net ======================================== |
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