Engine shuts off at deceleration?

Tiny
HERB 71
  • MEMBER
  • 1992 CHEVROLET SUBURBAN
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
Engine shuts off at deceleration. Will start back up idle maybe 5 minutes tops and dies again. Will not restart for a period of time. But if I keep the rpms up it will continue to run until deceleration. Any suggestions? Will be happy to donate if you have solution.
thanks herb
Wednesday, December 3rd, 2014 AT 9:56 PM

4 Replies

Tiny
CATAFINA
  • MECHANIC
  • 167 POSTS
Check the fuel pressure if within specs and also inspect and test the EGR valve
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Thursday, December 4th, 2014 AT 2:45 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Have you checked for trouble codes? Have you checked fuel pump pressure? Any vacuum leaks?
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Thursday, December 4th, 2014 AT 5:28 AM
Tiny
JOHNCHRISTOPER
  • MEMBER
  • 1 POST
If anyone finds them self having this problem, Check out the Temp sensor by the thermostat. It has 2 uses one to tell you the Temperature of the engine coolant and the other tells the computer to apply the choke which increases the fuel in the Throttle body. If the temp sensor is not working on the circuit that let the computer know the engine temperature then you will have a choked out engine even when it is HOT. I found this out because the same thing happened to me. I was half way to town (about 4Km) and the engine would die if I let off the Gas but if I held the peddle to the floor the engine could stay running because it was burning the rich fuel mixer but once it came back to idle it was flooding the engine and would die. I shut the truck off and let the engine cool for a half hour and it ran fine and would do it again once the engine returned to a high temperature till I replace the Temp sensor, never had a problem after that, would be a good thing to keep a extra new part in the glove box because I here this happening allot with these after market quality parts. My family members are Mechanic's Back yard and licensed and the licensed member was the go to for this problem.
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Saturday, September 2nd, 2023 AT 12:40 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Thanks for the info, I am sure many people will benefit from it.
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Saturday, September 2nd, 2023 AT 12:55 PM

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