Q: Why is my car stalling when reaching operating temperature?

asked by on September 09, 2016

after reaching operating temp. and approaching a stop or being stopped. car stalls, will not start. But i let go of key and it keeps trying to turn over on its own for a couple of seconds. then stops. and wont start. after waiting for it to cool down a little while it will start again.. Please help !! what can i do to figure out what the problem is??

My car has 93000 miles.
My car has an automatic transmission.

Hello. This is a common problem on this generation of Impala. Some solutions I have seen work with this problem are replacing the mass air flow sensor or crankshaft position sensor. The mass air flow sensor relays to the computer how much air is flowing into the intake system to allow for the proper air and fuel mixture. When this isn’t working properly, this can cause it to stall. The crankshaft position sensor is a small sensor located down toward the bottom of the motor near the crank that monitors the speed of the crankshaft and relays this info to the car’s computer to help control the timing of ignition and fuel injection.

Similarly, when this is not working correctly, it can cause errors in the computer and cause the motor to stall. One other item to check would be the ignition control module. This (working with other components) monitors the ignition process after gathering data from other sensors to tell the motor when to fire. When this is malfunctioning, this can also cause the motor to stall. To have the problem scoped out in person, I recommend having an expert from YourMechanic come to your home or office to diagnose the stalling issue and follow through with correct repairs.

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