1991 Honda Prelude When sitting idle

Tiny
JKERR1957
  • 1991 HONDA PRELUDE

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?

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Tuesday, August 17th, 2010 AT 7:41 PM

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Tiny
KHLOW2008
  • EXPERT
  • 41,975 POSTS

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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Saturday, August 21st, 2010 AT 7:27 AM

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