Rough idle, low power, no check engine light
My car sometimes doesn't start unless I give it a
little gas. It sometimes hesitates from a stop.
Overdrive has very little power, and rpm are low
(too low). Most of the issues happen after I have
drove for about 30 minutes and go into a store. Ill
come back out and start the car but it immediately
dies. Then I have to give it gas.
scan for codes even if the light isn't on ,
I have scanned for codes. I have none pending either. I got new plugs, wires, coils, fuel filter, and air filter. Cleaned the throttlebody and the egr valve tube and Maf sensor. That's about all I know to do.
Either the MAP ( manifold absolute pressure) or the MAF (mass air flow) is sensitive and needs a certain cleaner , I believe it's the maf that can be damaged from carb. cleaners ,no codes are up so without testing or real time scanning you can't tell whats going on ,you're not giving it gas you're just opening the throttle and that sensor tells the computer what you're doing , but let us know what happens .
I have a scanner that shows live data. Its a cheaper one but I don't really know what to look for. I guess I don't know what the values should be.
Could be your ECM failing. Same symptoms in my car even after I changed all the stuff you did. Finally, replacing the ECM did the trick.
Looking for a Used Grand Prix in your area?
CarGurus has 83 nationwide Grand Prix listings starting at $1,800.
Search Pontiac Grand Prix Questions
Pontiac Grand Prix Experts
Related Models For Sale