Poor gas mileage in 2001 Grand Prix
Senior Member
True Car Nut
Joined: Mar 2010
Posts: 7,124
Likes: 8
From: Portage mi
Alright??? Are you looking for help as to diagnose why? we need more info to be of any help at all
HAs it happend all of the sudden
or was is gradual?
any SES lights? stuff like that
HAs it happend all of the sudden
or was is gradual?
any SES lights? stuff like that
Thread Starter
Junior Member
Posts like a Ricer Type-R
Joined: Apr 2011
Posts: 20
Likes: 0
Had a mechanic look at the car, said plugs were fine @ 92,000 miles. Checked O2 sensor said it was clean. Checked PCM said it was not bad. Dan mentioned that the PCM should be recalabrated.
Senior Member
True Car Nut
Joined: Mar 2010
Posts: 7,124
Likes: 8
From: Portage mi
winter blend fuels do no good for mpg anyways but wouldnt kill it that bad..Were the spark plugs and or air filter replaced? pcv valve how is tire pressure...Was the catalytic convertor checked?