Engine Performance problem
1991 Oldsmobile Cutlass 6 cyl Front Wheel Drive Automatic 161000 miles
91 cutlass with 3.1 runs very rough at idle with missing and erratic rpm (maybe 700 - 1200), smooths out at higher rpm when driving, although I can still feel a miss. Idles fast sometimes at start (up to 2000 rpm), but generally does not miss on a cold engine for 5-6 minutes. I pulled trouble codes (got 22, 23, 35, and 53 in that order). Car has new TPS and new IAC valve. I still need to change the PCV valve. I checked all plugs and they seem to be ok. Removed EGR valve and it was pretty well choked with carbon. Cleaned it and replaced it. All the codes keep returning after being erased and engine restarted.
Code 53 is system over voltage according to what I found out. Checked voltage at battery with engine running and got 14.3 volts. The alldata flow chart says the problem is the alternator? Can too much voltage make the engine run rough like this? What do you all recommend?
have the same problem?
Tuesday, July 28th, 2009 AT 11:22 PM