Engine will stall when driving?

Tiny
JACOBANDNICKOLAS
  • EXPERT
I'm not sure what sensor would allow coolant to enter the oil. Are you sure it isn't a bad head gasket?
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Wednesday, January 20th, 2021 AT 10:46 AM (Merged)
Tiny
DBERRY
  • MEMBER
He checked and fixed also. Now, after all that, it will turn on and then die.
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Wednesday, January 20th, 2021 AT 10:46 AM (Merged)
Tiny
2001CHEVYIMPALA
  • MEMBER
  • 2001 CHEVROLET IMPALA
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 156,000 MILES
I recently acquired a 2001 Chevy Impala 3.8L. During the heat of the summer months my car will randomly stall while driving, usually during braking. The car will usually restart but will continue to stall out until it rests for about 15 minutes. The thing about this car is that it doesn't do it during any other season, just the summer. Also, when it recently had an episode of continuously stalling, I drove it up to our preferred mechanic. When trying to figure out what was wrong with the car, the mechanic couldn't get a code. Does anyone have any ideas where to start?
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Wednesday, January 20th, 2021 AT 10:47 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Does this only happen with the AC on? Have you checked for vacuum leaks?
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Wednesday, January 20th, 2021 AT 10:47 AM (Merged)
Tiny
2001CHEVYIMPALA
  • MEMBER
As far as I know there were no vacuum leaks. And it happens when the AC is both on and off. Sometimes blowing hot air through the vents can prolong the stalling, but it does not always work.
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Wednesday, January 20th, 2021 AT 10:47 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
If there are no vacuum leaks, my first suspect would be the idle air control valve (IAC). The IAC is responsible for maintaining the engine idle speed.
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Wednesday, January 20th, 2021 AT 10:47 AM (Merged)
Tiny
2001CHEVYIMPALA
  • MEMBER
Thank you! What would be your second suspect? I'm looking to fix the problem once and for all.
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Wednesday, January 20th, 2021 AT 10:47 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
The IAC is responsible for maintaining idle speed. Since there are no vacuum leaks, that is most likely the problem. However, there are many things that could cause this issue. A bad temp sensor, plugged catalytic converter, plugged air filter. And the list goes on. Regardless, these items should have set a trouble code. When it comes to the IAC, I have seen it not set codes.
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Wednesday, January 20th, 2021 AT 10:47 AM (Merged)
Tiny
2001CHEVYIMPALA
  • MEMBER
Thank you so much!
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Wednesday, January 20th, 2021 AT 10:47 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Keep in touch and let me know what you find.

Joe
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Wednesday, January 20th, 2021 AT 10:47 AM (Merged)

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