wiley5091
May 22, 2008, 01:56 PM
I just bought a 1990 Honda Civic standard hatchback with the 1.5L and a manual 4 spd. (no AC or power windows, etc.) and FI. When warmed up, the engine idle stays high for a period (i.e. 5-10 seconds) and then starts oscillating on a regular pulse from probably about 1500rpm to 700rpm (I estimate a 1-2 second oscillation period). The car runs fine, except for this oscillation, which is keeping me from getting the car smog tested. Any ideas what it could be?