Pontiac Grand AM GT
Problem:
Whenever I push down my gas peddle all the way, the car stops accelerating. This problem occurs at any speed whether on the highway or in town. However, if I accelerate by pushing my peddle down only part way, I have no problem. I've had this problem for over 1.5 yrs. now and the fixes I've gotten haven't worked. The "fixes" over the last 1.5 years include:
-Complete tune up, catalytic convertor, oxygen sensor. 2 weeks ago, my car broke down twice b/c of a bad alternator and battery, I got both replaced. Again, I've had the acceleration problem for over 1.5 yrs, but it's never been this bad. It got much worse it seems after I got my alternator and battery replaced (but I don't see any connection).
-More info: When I push the peddle, the engine can rev up to over 4,000 rpms., but it slowly rumbles down if I push the peddle down all the way, and as it rumbles down it stops gaining any speed (whether I'm going 30mph, or 70mph, it doesn't matter.) . Also, the gears shift smoothly and the check engine light is not on and hasn't been on. Also, when accelerating with the gas peddle down maybe 1/2 of the way, the engine smoothly accelerates past 2000 rpms smoothly but around 3000rpms, it seems to struggle a few times and then continue to go to higher rpms. Also, the car revs fine in neutral...
-Update: Service Engine Soon Light came on today but then went off after an hour of operation.
Any help would be great
Thanks !
Problem:
Whenever I push down my gas peddle all the way, the car stops accelerating. This problem occurs at any speed whether on the highway or in town. However, if I accelerate by pushing my peddle down only part way, I have no problem. I've had this problem for over 1.5 yrs. now and the fixes I've gotten haven't worked. The "fixes" over the last 1.5 years include:
-Complete tune up, catalytic convertor, oxygen sensor. 2 weeks ago, my car broke down twice b/c of a bad alternator and battery, I got both replaced. Again, I've had the acceleration problem for over 1.5 yrs, but it's never been this bad. It got much worse it seems after I got my alternator and battery replaced (but I don't see any connection).
-More info: When I push the peddle, the engine can rev up to over 4,000 rpms., but it slowly rumbles down if I push the peddle down all the way, and as it rumbles down it stops gaining any speed (whether I'm going 30mph, or 70mph, it doesn't matter.) . Also, the gears shift smoothly and the check engine light is not on and hasn't been on. Also, when accelerating with the gas peddle down maybe 1/2 of the way, the engine smoothly accelerates past 2000 rpms smoothly but around 3000rpms, it seems to struggle a few times and then continue to go to higher rpms. Also, the car revs fine in neutral...
-Update: Service Engine Soon Light came on today but then went off after an hour of operation.
Any help would be great
Thanks !
Apr 19, 2010 at 8:46 PM