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1996 Honda Civic IDLE SPEED

Tiny
MARSBAR24769
  • MEMBER
  • 1996 HONDA CIVIC
  • 4 CYL
  • 2WD
  • MANUAL
  • 100,000 MILES
I HAVE A "P" REG 1996 HONDA CIVIC COUPE 1.6ILS! WHEN I START CAR FROM COLD IDLE SPEED IS FINE! BUT WHEN IT WARMS UP THE IDLE SPEED GOES FROM 800RPM TO NEARLY 2000RPM CONSTANTLY UP AND DOWN! ANY THOUGHTS? THANKS BEN
Tuesday, May 12th, 2009 AT 4:39 AM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Most likely a vacuum leak somewhere. Check IAC (Idle Air Control) valve, remove and clean it and base it attaches to. If problem persists, you will have to find vacuum leak.

Could be a small crack in hose that gets bigger as engine heat rises.
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Tuesday, May 12th, 2009 AT 6:54 AM

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