Starts and runs cold and shuts off when at operating temperature?

2006 CHEVROLET 1500
13,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC
Avatar
G7CUSTOMER
  • MEMBER
  • 1 POST
The truck starts and idles fine and drives for a few miles, but when it gets up to temperature, it starts misfiring, idling bad and shuts off. I'll wait 30 minutes and will start up again.
I changed fuel pump, MAP sensor, Mass air sensor, crank sensor, cam sensor. coolant temperature sensor.
New Chevrolet long block installed 13,000 miles ago right from Chevrolet.
I'm at a loss.
May 25, 2023 at 10:23 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
JACOBANDNICKOLAS
  • CAR REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

When it stalls are won't restart, we need to see if you lost fuel or ignition spark to the engine. One is likely missing.

Do this. When it won't restart, see if it will start if you use starting fluid. If it does and then stalls, we know it is fuel related. If there is no change, I need you to check if there is spark to the plugs.

Here is a link that explains how that is done:

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

I realize you replaced several things. However, we could have a failing relay or another simple component that is failing until it cools. Also, let me know if you have access to a live data scan tool. I would like to know if the coolant temperature sensor is providing a proper signal and the short-term fuel trims if possible. If you have been able to retrieve diagnostic trouble codes, let me know what they are.

Let me know.

Joe
May 25, 2023 at 8:41 PM
Advertisement