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Hesitation when accelerating from a stop

Tiny
JOKYTAKI99661
  • MEMBER
  • 2000 CHEVROLET S-10
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 191,000 MILES
When coming to a stop then accelerating vehicle sounds like it wants to cut out it hesitateswhen I step on gas battery light flashes on and off for a second then vehicle runs perfect after. No check engine light on, spark plugs, wires distributor and rotor and fuel filter have been changed along with a new alternator rpms are perfect at idle.
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Tuesday, January 26th, 2021 AT 10:07 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Hi,

Is the engine idle speed dropping low enough to turn the battery light on? Have you checked for engine vacuum leaks? Have you checked fuel pressure? Are there any odd smells, smoke, or sounds from the exhaust or anything that stands out to you?

I have to be honest The first thing I would be looking for would be an engine vacuum leak or even a plugged catalytic converter. If you haven't already, check to see if there are any leaks. Here is a link that you may find helpful:

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

Also, take a look through this link and see if anything seems to mirror what you experience, and let me know.

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

Let me know.

Joe

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Tuesday, January 26th, 2021 AT 2:16 PM
Tiny
JOKYTAKI99661
  • MEMBER
  • 9 POSTS
The problem with vehicle was faulty mass air flow sensor which did not throw a check engine code. Tested while running. Unplugged sensor and vehicle kept running, if sensor was working vehicle would have shut off. Vehicle running like a champ now.
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Monday, February 1st, 2021 AT 7:39 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Often times it will shut the engine off. Did you replace it and it is running well now?

Joe
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Tuesday, February 2nd, 2021 AT 2:12 PM

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