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2008 Chevy Cobalt Jerking

Tiny
TMARTINAR
  • MEMBER
  • 2008 CHEVROLET COBALT
  • 4 CYL
  • FWD
  • AUTOMATIC
2008 Chevy Cobalt, ******** while sitting at stoplights, accelerating. I have changed the gas brand to Shell and put in heet and fuel line cleaner and it still does it especally when gas tank is less than 1/4 full. What could be the issue?
Friday, December 31st, 2010 AT 5:33 PM

7 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Is the service engin light comming on? Chevy has a few tech bulletins for different running problems, and even a PCM reflash, so codes are important, Autozone will read them for free, post all codes found here.
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Friday, December 31st, 2010 AT 5:46 PM
Tiny
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  • 7 POSTS
The service engine light is not coming on.
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Friday, December 31st, 2010 AT 6:26 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Any modification to the engine or air filter? If not check fuel pressure:
https://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm
Go here and checkout our video.
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Friday, December 31st, 2010 AT 8:52 PM
Tiny
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  • MEMBER
  • 7 POSTS
No modification to the engine, Jiffy Lub changed out air filter.
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Friday, December 31st, 2010 AT 9:06 PM
Tiny
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  • MEMBER
  • 7 POSTS
The car doesn't do this all the time.
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Friday, December 31st, 2010 AT 9:25 PM
Tiny
TMARTINAR
  • MEMBER
  • 7 POSTS
Could a dirty fuel filter be causing this? My wife had almost let the car's fuel tank run empty one day and this seemed to start after that?
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Friday, December 31st, 2010 AT 9:50 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Yes if you click on the link to the cheeck fuel pressure, it explains all that. The other thing is to recheck that air filter, Jiffy lube leaves a lot to be desired.
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Friday, December 31st, 2010 AT 9:53 PM

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