• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

Help 04 Grand Prix stutter hesitation bucking wtf???

I

intrinity

New member
hey yall:th_peaceout:

so i am having problems with this 04 grand prix. hopefully someone here can help
totally stock except a magnaflow cat.

the car hesitates bad at 1500rpm, any other RPM its fine. also when i romp on it sometimes the power surges. no check engine lights:th_sick1:

sometimes the car will stall when first started. i dont know if this is related.

i tried all new plugs and wires. autolite plugs gapped at .50

i am leaning toward an electircal issue.:th_wtf:
gonna try cleaning the throttle body and mass air flow first.
then replacing the MAP and IAT senors.

in addition the gas cap warning comes on sparatically

ANYBODY????
 
Last edited:


MAF would be a good place to start. I do believe the IAT is part of the MAF sensor. Replace the gas cap with one from the dealership. We have had a flood of customers bringing their cars in for small evap system leaks/gas cap warnings. They have all claimed to have replced the caps but the light still comes on. Smoke test shows 90% of the after-market caps leak just enough to trigger the light/DTC.
 
thanks for the reply

i cleaned the throttle body, it was filthy.

cleaned the MAF.

there is a hard vacuum line that runs from the air intake to the TB. it practically fell off it was so lose so i added hose clamps-i saw it as a possible vacuum leak.

the car ran smoother, hasnt stalled on start up yet, but still has low RPM bucking.

what else could it be???

could the MAF still be at fault? im lost
 
You must log in or register to reply here.
Back
Top