Engine Mechanical problem
2002 Oldsmobile Bravada 6 cyl All Wheel Drive Automatic 127000 miles
Truck was running fine. Got in it one day and it started misfiring and the SES light started flashing. Took it my mechanic and he scanned it. Said he was getting random cylinder P0300 code. Plugs were original, so he changed them, but still misfired. Took it to his GM mechanic friend to put on their scanner. Got the P0300 code. Shut it down to check some things, started it again and it ran fine, so I picked it up. Drove it about 20 miles and felt some skips. Got in it the next morning and it started misfiring and SES started flashing again. Took it back to GM dealer and he did a “leakdown" test. Said cylinder one was 20% and the other cylinders ran between 3% and 10%. His conclusion was it probably needs a valve job. He did something and it ran fine again for about 20 miles. Now when idling the RPM’s are bouncing from 500 to 8 or 900 about every 12 seconds. Took it up the road today and RPM's had random slight fluctuation a few times. Question: if it was the valves, would it run OK f or awhile then mess up again? How much is a valve job? Been reading all kinds of similar scenario’s and don’t know where to go from here? Any ideas? Thanks!
have the same problem?
Monday, February 16th, 2009 AT 5:56 AM