Engine Performance problem
2000 Oldsmobile Alero 4 cyl Front Wheel Drive Automatic 105k miles
Engine is 2.4 L
My car was working fine, and I changed the spark plugs with NGK platimum bought at Autozone.
the problem started after I put everything back together. The engine starting running very roughly and stalls after a few miles.
just to make sure the new plugs were not bad, I put the old ones back, but there was absolutely no difference. Just to make sure none of the plug coils were bad, I replaced them as well, but it made absolutely no difference.
I'm thinking that I must have knocked something loose like some vaccum hose or something.
the funny thing is at random times, everything is OK. I mean in the middle of coughhing and sputtering, all of a sudden I'll get full power for a few minutes then it will go back to the misfirings.
At one point, I drove almost 12 miles back to the house all the time sputtering and stalling. After I shut the engine down, I restarted it after a while, and it was as if nothing was wrong. It ran absolutely smooth for approx 5-10 minutes before dying and then the same issue happened.
I believe the error code obtained by the engine analyzer at autozoone was PO300. It did not specify any cylinder.
I'm completely stumped!
have the same problem?
Tuesday, May 19th, 2009 AT 8:39 PM