My check engine light is on and sometimes flashes

Asked by 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

10,370

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.

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