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Diesels when turned off during the high acceleration

Tiny
HERALD TRUMPET
  • MEMBER
  • 1991 BUICK CENTURY
  • 3.3L
  • V6
  • 2WD
  • AUTOMATIC
  • 255,000 MILES
When starting the engine, the engine accelerates at high speed until I turn off the ignition. But then it does not turn off completely. Instead it diesels. It diesels only when being forced to turn the car off when it has started at full speed acceleration. The problem is only occasionally.
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Tuesday, October 16th, 2018 AT 11:15 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,895 POSTS
The high idle is the problem once they is fixed the dieseling will stop. It sounds like you have a IAC motor that is stuck. Here are two guides to help and the location of the IAC for your car below:

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

and

https://www.2carpros.com/articles/engine-idles-too-high

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

Cheers, Ken
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Saturday, October 20th, 2018 AT 10:56 AM

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