What else can you tell us about other problems you are experiencing?Car runs fine, would not believe that it needed anything
You didn't mention air filter. Has that been changed?It was checked when I had the car inspected 1 month ago
Do you have a lockable gas cap?no
Tell us more.
This is a 2001 grand prix with a 3.8 engine. Best gas mileage ever gotten was about 18, in winter getting 10
Spoke with (emailed) danthurs said have the PCM checked. Mechanic checked this and said it was ok.
Then I called a Pontiac dealership and ask him if he would check the PCM.
He told me that if it wasn't working that a light would show up on the dashboard.
According to dan, he could have run a computer check up on this and maybe adjust, but the dealership said no