2001 Pontiac Grand Prix Repair Question
Topics covered: Fuel pressure, Engine, Check engine light.
Mileage: No information provided.
Mileage: No information provided.
Asked on November 28, 2009
2001 Pontiac Grand Prix Loss of power on my GTP
Engine Performance problem
2001 Pontiac Grand Prix 6 cyl Front Wheel Drive Automatic
Fixed the MAF Sensor, cleaned the EGR, changed spark plugs and wires. The car runs fine. Problem is when you accelerate to pass another car the motor starts trembling and looses power as if it were choking. I know its not the limiter, there is no exact RPM for the misfire or what ever is happening. When put in a fast acceleration it chokes and trembles, gains power and looses it again in different intervals. If you dont push it hard it runs fine. Has no check engine light on. Im tired of "repairing" different things and the car remains the same. Could it be the ECM, PCM, Supercharger or something else?
2001 Pontiac Grand Prix 6 cyl Front Wheel Drive Automatic
Fixed the MAF Sensor, cleaned the EGR, changed spark plugs and wires. The car runs fine. Problem is when you accelerate to pass another car the motor starts trembling and looses power as if it were choking. I know its not the limiter, there is no exact RPM for the misfire or what ever is happening. When put in a fast acceleration it chokes and trembles, gains power and looses it again in different intervals. If you dont push it hard it runs fine. Has no check engine light on. Im tired of "repairing" different things and the car remains the same. Could it be the ECM, PCM, Supercharger or something else?
Asked by ecosme74Answer
Replied on November 30, 2009
Start by measuring fuel pressure with mechanical gauge. Check the fuel pressure regulator for gas in vacuum line.
Are you getting any boost?
Replied on November 30, 2009
Between the intervals of the misfire you can feel the supercharger boost but then it cuts to the misfire and so on. Ill be checking the fuel pressure this week, thanks.
Replied on December 1, 2009
Let me know what you find. If FP is OK, then you have a ignition problem.