Stalls when the car is warm

JD444

MEMBER
1998 PONTIAC BONNEVILLE
AUTOMATIC
150,000 MILES

Would you be so kind as to offer your knowledge, the car stalls at stop signs or while slowing down and approaching a stop sign or red light when it’s been warmed up, it seems to happen when the car is warm and/or when its a warm day, the alternator has been changed, the wires and spark plugs have been changed and a module/sensor 200.00 part (?) Has been changed and it is still stalling, could it possibly be its idling too low? Its idling at 1, our mechanic has changed all of the above in three separate occasions and we are still having this problem, he has replaced the above noted parts and the problem still persists.
Please help, thank you.

3 Replies

JACOBANDNICKOLAS

MECHANIC
108,133 POSTS

Have you checked for vacuum leaks? Have you checked the idle air control valve (IAC)? The IAC is responsible for maintaining the engine idle speed.

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Tuesday, December 3rd, 2013 AT 9:00 AM

JD444

MEMBER
21 POSTS

Sorry for the late reply, however, we are still dealing with this problem. We brought the car to gm good wrench for a diagnostic test, they disconnected 2 components the mass air flow censor, this is an aftermarket part (this is the 200.00 part I stated above) and the ERG (fuel re circulating sensor), they told me to drive the car to see if still stalling, Good wrench told me either the mass air flow sensor is defective or the car needs a new ERG sensor, I am driving the car and it is not stalling anymore and has never run better, I just found out that I'm driving in fail safe mode, how long can I drive like this without these 2 components? I have already put a lot of money into this winter car and really don't want to sink anymore money into it, I don't drive it a lot, I'm extremely frustrated with the whole situation.
Thanks for your help.