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What would cause an 84 Pontiac Fiero to have a very high idle at 3000rpm?
Wiki User
∙ 12y ago
I was got the same problem and first check the TPS sensor but the RPM still high, then change the IAC valve and nothig happens, and at last change my Teperture sensor and this are broken and send to the Module a temperature very cold then the engine runs fast to warm itself, I change and everything goes fine.
AnswerUsually that is caused by a vacuum leak. Check for vacuum leaks in hoses and the base of the throttle body or carburetor.I own a 1984 Fiero SE 4spd.
The computers need to relearn when the battery is disconnected.
Especially the IAC(Idle Air Control) Valve.
When the battery is disconnected, the computer goes to default mode.
The IAC will not seat, causing a very HIGH IDLE @ 2500-3000 RPM. After the Vehicle is DRIVEN OVER 35 MPH, the idle WILL return to normal. The IAC seats itself at 35 mph so the
engine won't stall. Seating itself to get a reference point for the computer. Seating means in all the way and cutting off air flow. Below 35 MPH, the engine would stall.
A vacuum leak would do this, if it's still idling high after driving 35 + MPH.
Wiki User
∙ 12y ago
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