Question: I have a 2002 Pontiac Grand Prix. It does not have any get up and go. When I floor it, it bogs right down. I changed the fuel filter but it made it worse. I had it put on a scope at two different places and nothing came up because the check engine light is NOT on. Could it just need a tune up?
Answer: Hello. I think I can be of some help. A couple common things. 1- The fuel pressure should be checked to see if that is the cause of your problems. 2- Mass Airflow Sensors can also cause this problem but would have a code stored. 3-The most probable cause by reading your condition is that the catalytic converter is plugged. This is a very common problem. That also should have a check engine light with a code p0420, but not always.
The good news is that GM has a special policy adjustment for a failed catalytic converter. It is under warranty for 10 years or 120k miles. The special policy adjustment has a GM policy #05551. FYI, a catalytic converter replacement job at the dealer would normally cost $400-$700. Hope this was helpful to you, SF
1999 Pontiac Grand Prix gtp 3.8 SC. Question: It runs fine until i press gas then the car feel like can not go faster like does not open gas at all if i press gas gently gradually it go more until a limit. Also if i am driving at 30 mph w/ light or no acceleration it start a failure in the engine, is possible vacuum hoses, or gas regulator? No check engine light appear on dash is this because a possible broken light?
Answer: Trying to understand what you are describing, this may be a low fuel pressure problem caused by a plugged fuel filter or failing pump. This could also be a plugged catalytic converter. That gives the same feeling of a fuel pressure problem where you hit the gas and it will not accelerate. If by a "failure in the engine" you mean it is running bad, then the catalytic converter problem or bad spark plug wires causing an engine misfire could be your problem.
Question: My 2003 Pontiac Grand Prix 3800 V6 will turn over, run for a couple of seconds and then shuts off. After about the 10th try it ran fine. My son says it has been difficult to start for a week or two.
Answer: Hello and welcome,. This could be 1 of several problems. You could have a fuel pressure problem(bad fuel pump, plugged filter), Leaking fuel pressure regulator causing a rich condition- which would stumble and chug before it dies, or you could have a theft system problem.
If after it starts and stall, leave key on and see if the security/theft light stays on or flashes-that would indicate a theft problem. While it is acting up, will need to check these things.
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