Engine revving when idoling

HONDA CIVIC
Avatar
LANGE25
  • MEMBER
  • 1 POST
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.
Jul 10, 2007 at 1:38 PM
Avatar
BRUCE HUNT
  • ✓Experienced 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.
Jul 11, 2007 at 3:29 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle