I have a pontiac grand prix gt 3800 non turbo is 2000. One minute the car runs great the next minute it falls on it's face. Will buck and hesitate, can push pedal to the floor and not go over 35 mph rpms don't go up either. Have checked or changed plugs, wires, coils, ignition module, fuel pump, fuel pressures, injectors, catalytic converter, o2 sensors, grounds.. code reader throws o2 sensor code and occasionally a multi misfire. Check engine light comes off and on no ryhme or reason.. Please any help can't keep replacing everything and can't buy new... Thank you
I have a 2003 Pontiac grand prix...I've lost power, it won't go over 30mph, it doesn't shift thru the gears smoothly. The service engine soon light goes off and on, more so when I'm trying to gas it. Its seems as tho it's 'being choked'...like not getting gas or air. So far, I've flushed the ******, changed the plugs, wires, air filter, fuel filter. I suspect the problem is a clogged cat convertor. I've been told that the exhaust can be opened a little near the cat to allow air to flow in....that should confirm if the problem is the Cat or not. I'm testing that theory today.
Look a round the injectors for wet or damp spots(bad seals)...my 3800 was sucking air around seals causing it to run rich and throw codes for misfires and 02 sensors
Maf sensor
835 views
Usually answered in minutes!
×