Question about 2007 Pontiac Grand Prix GXP Sedan
No check engine light, and tends to be more noticeable after engine is warmed up
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Posted on Jan 02, 2017
i had a 94 that ran into problems like that with very rough idles and misses. i get about five different codes from injectors to oxygen sensor. turned out my negative wire from the battery was so corroded inside the insulation it was causing all sorts of problems. bought new cable and ends from canadian tire $40.00 and installed (had to clean the connection to the block with sand paper) but fixed all my problems after that.
Posted on Apr 17, 2009
Have you ever had the catalytic converter changed. Over time the pellets inside will melt together and this will make the care very very sluggish like it does not want to run. You may want to try that.
Posted on Jul 06, 2009
The only thing left is the injector or a vacuum leak on the manifold gasket sucking air in and causing a lean condition. Thats is its the only common issue providing you dont have a head gasket issue leaking coolant on that cylinder and the compression and valves are not leaking. The old spark plug should show a coolant issue if present. The white part will be shiney if you have a coolant loss. If the coolant is looking real dark you should have the cooling system checked for gas being pushed into the cooling system on compression stroke thru the head gasket.
Posted on Nov 12, 2009
Hello! There is a device called a purge valve; located in the back/right of the engine compartment next to the throttle body. The original fault was a "mass evap. leak code. Changing the gas cap was the correct, least expensive move. The purge valve is the likely culprit. If the catalytic converter was at fault a code indicating; Cat., or O2 sensors would have been set. If the valve can not open to purge the vapor pressure will give the faults you are seeing. Also if valve remains open auto will not run right anyway. Evaporator problems are unrelated to converter trouble. I suggest you replace the purge valve. There is also a vent valve located back by the gas tank; It is a part of this very complex system. Give that valve a good visual inspection (broken or worn wires/connectors or loose hose) before you purchase the purge valve.
Posted on Dec 10, 2009
Testimonial: "Déjà vu. They mechanic that solution 1 pointed to pretty much told me exactly the same thing. Thanks so much!"
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