Hey all, I've been driving my brother's old '98 Buick Regal GS with 3800 S/C lately. Usually the car is dead nuts reliable, but it stalled at a light a few weeks ago. It still made good fuel pressure and would crank over, but no spark.
So, I tracked it down to a bad ignition control module and bought a new one on Rock Auto. It was Standard Motor Products replacement.
The car fired back up and seems to run normally (most times), except it has been hard starting ever since putting it in. It sounds like the ignition timing is way off or something. Yesterday it started up and was so low on power that it would barely drive at walking speed, and bog down even if you tried to rev it. I checked the codes with an OBDII scan tool, but it had none.
Right after that, it fired right up like nothing was wrong, but the hard starting persists. It started up easily before the old ICM died.
Any ideas? Are the aftermarket ICM replacements not as good as OEM or an ACDelco replacement?