What would cause a 93 Grand Prix 3.1 to stall out?

Question

The problem started a week ago when I got a starter put in.This never happened before my car was running just fine.Now when I start it up the RPM idles kinda high ,give it a few seconds and it settles.Sometimes it will give me problems starting up too.Now everytime im driving and pressure is applied to the brakes the car starts to hesitate and will stall out,but recently I've learned as soon as I come to a stop if I put it in neutral/park it wont stall out (if im lucky).The (Service Engine Soon) light only comes on once the car stalls.My fiance works at an oil shoppe so were pretty good at keeping up with oil changes,air filters,flushes...etc.We also did a tune up hoping that would fix it but it didnt.We thou
ght maybe bad gas and put some dry gas in it but that didnt help either.Then someone told us it might be the mass air flow meter. Would that cause a 93 Grand Prix 3.1 to stall out and idle high only when the brakes are pushed?

Answer 1

Sounds to me like the car needs to re-learn idle. Fairly easy to do.
Here is the basic procedure:
Turn all acc. off
Disconnect the battery for a min to clear ECM.
Reconnect battery.
Start the car and let it idle until the radiator fan cycles on and off one time.
Turn the car off for 5 minutes.
Start the car again and let it idle until the fan cycles on and off one time.
Now the computer has relearned the idle.

Answer 2

During deceleration engine vacuum is highest. Which indicates that your problem is vacuum leak. A bad enough vacuum leak in the intake will lean out your air fuel mixture so much that it will cause your engine to stall. Check the engine when it is in idle. Listen for a suction sound. if you do not hear it there is a simple test you can do. Get yourself a small propane bottle. (You can find these at a local hardware store for a few bucks). turn on the car and let the idle settle. The open the propane bottle 1/4 open. run it through the vacuum lines and engine block. check around the intake manifold especially. If the idle increases when you run the propane bottle through the engine compartment then you have a vacuum leak. The propane causes a rich air fuel mixture and increases idle momentarily until the computer compensates.

Answer 3

I would check to see if when the starter was installed an engine vacuum line was knocked off, kinked, broken, or not re-installed when the work was finished. If it happens only when the brakes are applied, and of course you have vacuum-assisted power brakes, the engine is having to compensate or, in the case of it stalling, isn't able to meet the demand of the brakes and the other vacuum-assisted items on the engine and vehicle.

Answer 4

Theres an element spoke of as IAC. (Idle Air administration) regularly placed close to or on the throttle physique. indications of a defective IAC are adverse idling and stalling. verify for ideal setting up of gasoline clear out. Hook up a gasoline stress gauge and discover the specs and learn. reliable success

Answer 5

have you checked your O2 sensors and yes it might be your mass air flow meter my lumina had to have a new one word of the wise if you need to get one go to the junkyard to get one a whole lot cheaper hope this helps good luck

Answer 6

I wonder whether a vacuum hose might have been knocked loose when the starter was replaced.

Answer 7

check the coils first.then the throttle position sensor