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1989 Honda Civic High Idle

Tiny
FTADUFFY
  • MEMBER
  • 1989 HONDA CIVIC
  • 1.5L
  • 4 CYL
  • 2WD
  • MANUAL
  • 188,000 MILES
Intermittently the engine will idle high. It should idle around 700- 800 RPM. Every so often it will idle high any where from 1200 to 3000 RPM. It does not matter if it is hot or cold. Sometimes if I turn the engine off and restart it will be OK.
Thursday, January 23rd, 2014 AT 10:02 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try cleaning both sides of throttle palte and iac hole with choke cleaner see if that helps.
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Friday, January 24th, 2014 AT 7:03 AM
Tiny
FTADUFFY
  • MEMBER
  • 2 POSTS
I tried that and it "seamed" to work for about 5 days. Next I am going to try cleaning the IAC Valve. I know how to get it off but, except for the two screws, I am not quite sure how to take it apart. Don’t want to make anything worse I could not find procedure on Internet. Thank you for your help
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Friday, January 24th, 2014 AT 10:48 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
The iac doesn't come apart it is a replaceable part.
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Friday, January 24th, 2014 AT 12:33 PM

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