My check engine light flickers with a miss in the engine. This happens at idle and all the way up through acceleration. The miss goes away on harder acceleration but the light glows solid during this time. No codes are being set other than the 1222 that has been there for a while.
A little history. This is a 1989 535i. I had an occasional high speed miss that I thought would be corrected after I peplaced the crankshaft pully/harmonic balancer yesterday. I installed a unit from my donor car as the old one had a cracked bore and broken keyway. This showed up as no spark last week due to the pulley not moving with the motor. I replaced the cap and rotor before I discovered the pulley problem.
The repair was finished yesterday afternoon and at the end of an otherwise uneventful 20 minute test drive the missing started. Cruising seems Ok. this shows up at idle and acceleration. I have checked the crankshaft position sensor clerance (0.40 ) and resistence (545 ohms) with no changes when moving the wires.
Does anyone have suggestions where to look next?