Engine Performance problem
1999 Pontiac Grand Prix 6 cyl Front Wheel Drive Automatic 135000 miles
I've been working on an issue with my car for some time already. I have dropped from getting 28mpg to 22 mpg. I am also getting codes for misfire and running rich. After a major tune up as well as a few other repairs (with no positive results), I have just found out my fuel pressure is 43psi when the key is in the 'ON' position but then jumps up to 83psi after I start the car. When I take the vacuum line off from the Fuel Pressure Regulator while the car is running, there is no change in the fuel pressure or the performance of the car.
Does it seem like the problem is the Fuel Pressure Regulator or is there a problem elsewhere?
have the same problem?
Tuesday, February 24th, 2009 AT 8:15 PM