My check engine light is on and sometimes flashes

Asked by Marcaroni2 Nov 05, 2014 at 06:09 PM about the 2001 Chevrolet Lumina

Question type: Maintenance & Repair

I believe it's a vacuum leak I replaced the PCV valve and cracked elbow going to it but
still have the problem. Seem to hear a hissing sound against the fire wall on the
passenger side. Also could it be a bad o2 sensor?

1 Answer
30,540

mikeatpriestlake answered 10 years ago

gonna have to scan the computer and get that code. if you hear hissing, that is probably your leak. when the car is cold, spray a little carb cleaner around in there and see if the idle changes. might help you pinpoint your leak.

Mark helpful

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