WHEN SITTING IDLE

1991 Honda Prelude

Tiny

jkerr1957

August, 17, 2010 AT 7:41 PM

Engine Performance problem
1991 Honda Prelude 4 cyl Two Wheel Drive Manual 149000 miles

when car is sitting idle engine goes up to 1600 rpm than back down to 1100 rpm over and over. What could be wrong with it?

FOUND 14749 RELATED QUESTIONS

1 Answer

Tiny

KHLow2008

August, 21, 2010 AT 7:27 AM

Hi jkerr1957,

The idling system has a fault and it could be: 1, Vacumn leakages,
2. Faulty Fast Idle Thermo valve.
3. Lack of coolant.
4. Clogged coolant hoses.
5. Idling speed adjusted too high.

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