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Engine tries to shut off when stopping

Tiny
ALLEN6
  • MEMBER
  • 1995 CHEVROLET S-10
  • 4.3L
  • V6
  • 2WD
  • AUTOMATIC
  • 250,000 MILES
4.3l tbi. It tries to stall but does not. It goes right back to normal. Have no codes. You can watch the volt gauge drop from 15v to 13v when it does it. Checked the alternator putting out 14.3 volts new battery. At first I thought it was the idle air control after replacing it it drove fine for a week and now it's starting to act up again just like before.
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Tuesday, December 17th, 2019 AT 5:10 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,787 POSTS
Hi,

When you replaced the IAC, was there any dirt or carbon where the pintle enters the throttle body? Have you checked for engine vacuum leaks?

Here are a couple links you may find helpful:

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

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Let me know.
Joe

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Tuesday, December 17th, 2019 AT 8:59 PM

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