Engine is shutting off when it is hot outside when driving or parked

2003 CHEVROLET SILVERADO
254,293 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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APPLES381
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  • 3 POSTS
When the truck is idling or when driving down road and starting to slow down it will Shut off and sometimes won't hardly run for awhile after being parked. It mainly does this when it's hot outside. Also the heat will start in why the air conditioner is running. Will be cold air and out of nowhere it gets hot and we have to turn off engine then restart the truck for it to blow cool again.
Jun 14, 2021 at 5:46 AM
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KASEKENNY
  • ✓Experienced Mechanic
  • 18,907 POSTS
This sounds like two separate issues so let's start with the running issue then we can tackle the A/C issue.

Here is a guide that will get us started with this issue:

https://www.2carpros.com/articles/stall-at-idle

Also, this sounds like a possible crank sensor issue so let's review this as well.

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

When the engine stops running can you crank the engine and it just doesn't start? If so, we need to check the basics when this is happening. Starting with looking at the RPM gauge and seeing if it is moving at all when you are cranking the engine.

If it is then let's check the fuel pressure when this happens as that is the next likely issue.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Let's start with this and go from there. Thanks
Jun 15, 2021 at 11:22 AM
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APPLES381
  • MEMBER
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What should my MAF reading on a live data autel maxi check?
Jun 16, 2021 at 5:15 AM
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APPLES381
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Also when truck is off and no acceleration to pedal TPS is reading at .4 to .0.
Jun 16, 2021 at 5:17 AM
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