While driving the temperature gauge drops and the engine starts stalling

WEWOS

MEMBER
2000 CHEVROLET TAHOE
5.3L
V8
4WD
AUTOMATIC
260,000 MILES

When driving on the highway At 65, I felt that the truck started acting weird. The temperature gauge started dropping and the truck started stalling. So I had to rev the gas to go back to normal. I would go through a bump and it would get better. After 20 minutes on the road The same problem.

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,513 POSTS

I would check the coolant level first then lets check the codes. this guide will help us get started:

https://youtu.be/GSE9skKnOgY

and

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down this guide and report back.

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Friday, March 5th, 2021 AT 7:45 PM

WEWOS

MEMBER
1 POST

No codes thrown.

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Saturday, June 5th, 2021 AT 1:34 PM

KASEKENNY

MECHANIC
18,907 POSTS

This sounds like the temp sensor is failing or you have a connection issue.

If the cooling temp drops the PCM is going to alter the air fuel ratio and this could cause a stall or poor running condition.

https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

If nothing turns up, I would replace the sensor and retest to see if this happens again. When you have it apart, check the connector terminals and make sure they are clean and tight.

I attached the info below on how to do this. Please run through this and let us know what happens.

Thanks

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