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Truck it ran rough and would just stall while driving?

Tiny
BROKE DOWN 2005
  • MEMBER
  • 2005 CHEVROLET SILVERADO
I had a stalling issue with my truck it ran rough and would just stall while driving. I had it diagnosed and was told I needed a complete tuneup and a thermostat. After doing the tuneup and changing the thermostat the truck started and ran great idling in the garage. When it hit operating temp. It shut off as if you turned the key off! And would not start! I disconnected the battery to reset the computer and let the engine cool down. After doing this 3 times it would start the last time it ran idle for 20 minutes at oper. Temp. Than shut down again and now it won't start! Help!
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Saturday, January 3rd, 2009 AT 8:35 AM

7 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Well, now that it wont start.

Check for spark with a spark tester, check all cylinders, note the spark.

Bright? Blue? Well defined?

All sparking at the same pace?

How about fuel pressure.
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Wednesday, September 2nd, 2020 AT 12:52 PM
Tiny
BROKE DOWN 2005
  • MEMBER
  • 4 POSTS
Now there is no spark! Fuel pressure was tested to be good by diagnostic exam. Is the computer capable of keeping the engine from firing if there is a defected sensor? It had coded a bad temp sensor prior to changing thermostat.
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Wednesday, September 2nd, 2020 AT 12:52 PM
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
If the crank sensor is bad it could be showing hardly any signal causing that to happen but usually if a sensor is bad it goes to base programing and guesses so it will spark and run eventually.

Disconnect some sensors and try to start it, anything?

The temp sensor wont affect spark, just fuel mixture.
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Wednesday, September 2nd, 2020 AT 12:52 PM
Tiny
BROKE DOWN 2005
  • MEMBER
  • 4 POSTS
Turns out the problem was electrical the wiring harness between the coil and ignition module had a broken wire $20.00 part fixed the problem!
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Wednesday, September 2nd, 2020 AT 12:52 PM
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Glad to hear you have found the problem, and thanks for posting the solution back to help others!
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Wednesday, September 2nd, 2020 AT 12:52 PM
Tiny
VINCENTSAELI
  • MEMBER
  • 1 POST
What was the $20 part?
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Wednesday, September 2nd, 2020 AT 12:52 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,443 POSTS
Reading through the post it looks like it was a replacement of the wiring harness from the coil to the ignition module.
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Wednesday, September 2nd, 2020 AT 12:52 PM

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