1998 Honda Prelude idle goes up and down

Tiny
MATTYP
  • MEMBER
  • 1998 HONDA PRELUDE
  • 4 CYL
  • FWD
  • MANUAL
  • 50,000 MILES
Idle goes up and down when warm or cold. Have a jbm h22a motor
Monday, April 26th, 2010 AT 4:56 PM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Hi mattyp,

If the idling speed is too high, it would cause that.

Possible causes are:
1. Idling speed adjusted too high.
2. Leaking vacumn, PCV, vacumn hoses etc.
3. Faulty or stuck IAC.
4. Lack of coolant in system.
5. Clogged coolant hoses to IAC
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Saturday, May 1st, 2010 AT 6:39 AM

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