Idle speed up and down

Just purchased 1997 civic 1600 5sp with 133k.

Motor idles up and down at stops what does it need?

ths Eddie in Ky

This problem usually indicates that there’s a vacuum leak somewhere on the engine.

Inspect all the vacuum hoses on the engine for any that are disconnected or leaking. If none are found, then start the engine and while it’s idling take an aerosol can throttle body cleaner and spray this around the intake area of the engine. If there are any vacuum leaks, the engine idle speed will change when the cleaner is drawn into the engine at the leak.


Thanks for a starting point, I will see what I can find.