idle goes up and down when warm or cold . have a jbm h22a motor
Apr 26, 2010 at 9:56 AM
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KHLOW2008
✓Experienced Mechanic
41,812 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