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Engine revving when idoling

Tiny
LANGE25
  • MEMBER
  • HONDA CIVIC
I have a 2003 Honda Civic with 127,000 miles. When the clutch is in or it is in neutral, the engine revs up on its own up to about 3000rpm, then down to 0 and back up. It continues to go up and down until it is put in gear. Can you let me know the problem.
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Tuesday, July 10th, 2007 AT 8:38 PM

1 Reply

Tiny
BRUCE HUNT
  • MECHANIC
  • 3,754 POSTS
The engine is surging. Does it do it cold, warm or anytime? Generally, a vacuum leak or air trapped in the cooling system. I would search for vac line problems and bleed the cooling system. Bleeder should be located at the top radiator hose near the head. There us know how that worked.
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Wednesday, July 11th, 2007 AT 10:29 AM

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