1992 prelude idles inconsistently

1992 ALL OTHER MAKES ALL OTHER MODELS
Avatar
JOSHWITDATALON
  • MEMBER
  • 15 POSTS
we are repairing a 92 prelude and we bought a used motor with 20,000 miles on it and when you start it it will rev to 1800 rpms and then drop to about 1000 rpms and it will not stop doing it. you can drive it and when you are accelerate its perfectly fine runs like a charm then, but if you have to stop at a stop sign it sits there and sputters so badly we have tried everything we can think of in autos because it is our senior vocational autos class project so any info will help us greatly. thank you very very much!
Mar 29, 2007 at 1:21 PM
Advertisement
Avatar
BRUCE HUNT
  • CAR REPAIR CONTRIBUTOR
  • 3,754 POSTS
Your vehicle is surging. Common problem caused by one of a number of things. Engine coolant must be full, it must be purged of air, there can be a vacuum leak, leak at the intake manifold, dirty idle air control, etc.

Start there.
Mar 31, 2007 at 11:53 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.