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Engine stalls, then starts back up?

Tiny
JONSOLOW13
  • MEMBER
  • 2014 CHEVROLET SONIC
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 119,700 MILES
Intermittent issue, car drives fine, then suddenly stalls, then restarts and runs fine, then a little later stalls again. However, it has only happened a few times since we changed out the valve cover and valve cover gasket, which was 200 miles ago.

No check engine light.

Any ideas?

Thanks,

Jon
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Thursday, January 25th, 2024 AT 1:20 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi Jon, if this just started since the gaskets were replaced, have you checked to make sure no vacuum hoses are damaged or disconnected?

Do me a favor. Take a look through this link and then check for leaks:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Let me know what you find.

Take care,

Joe
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Thursday, January 25th, 2024 AT 8:08 PM
Tiny
JONSOLOW13
  • MEMBER
  • 133 POSTS
So, we didn't check for vacuum leaks, but the stalling is really very intermittent, meaning not every other minute. Additionally, I spoke with a master "sonic" wrench, and he thinks there might be a tear in one or more of the coil pack sleeves which when hot or "bumped" would open and cause a short which in turn would cause the stall.

Anyway, tomorrow we will start diagnosing and looking for the problem.

Thanks,

Jon
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Thursday, January 25th, 2024 AT 9:38 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi Jon,

Thanks for the update. Let me know what you find or if there is anything I can do to help.

Take care,

Joe
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Friday, January 26th, 2024 AT 7:21 PM
Tiny
JONSOLOW13
  • MEMBER
  • 133 POSTS
So, here's an update- pulled the coil pack and, to my surprise, two of the packs had broken rubber/plastic sleeves, and it appeared they were broken inside! Bought a new pack and the car is running great.

Thanks for your interest and input,

Jon
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Friday, January 26th, 2024 AT 7:50 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Jon,

That's great news. I'm glad to know you found the issue. Also, your solution will likely help others.

Take care of yourself and feel free to come back anytime in the future.

Joe
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Friday, January 26th, 2024 AT 8:02 PM

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