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post #1 of 4 (permalink) Old 02-19-2018, 04:43 PM Thread Starter
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Car jerks when speeding up some times

Hi
some times my cobalt jerks when speeding up
its not all the time .

hope some one can help
thank you
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post #2 of 4 (permalink) Old 02-20-2018, 07:27 AM
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Not a lot of details....

Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
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post #3 of 4 (permalink) Old 02-20-2018, 08:37 AM
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I have the same issue!! It almost feels as if it is skipping. It is not a misfire for me but under heavier than normal acceleration, usually in 3rd, 4th, or 5th gear it does this. I have not been able to find a pattern either. I rarely run my A/C or heater so its not that.

I have:
Changed the coil pack
cleaned the throttle body
checked air filter (Clean)
replace thermostat and coolant
replaced serpentine belt (this is is the last thing I have done and thought that maybe the belt was slipping. I replaced it because it was squealing when it was cold)

The only thing I can think of is my cat is going back because I have a recurring P0420 code coming up. I think this because it is my understanding the Air/Fuel ratios are influenced by the O2 sensors and my downstream sensor closely follows my upstream sensor. I am hoping that when I replace the cat it will go away, that's just a hope though.

newb - 2005 Cobalt, Base Model, 5 speed. 2.2 Ecotech
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post #4 of 4 (permalink) Old 02-20-2018, 09:28 AM
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Could also be passing water from the gas. Water doesn't burn and when it goes to a cylinder it just kicks a little. If it still does it after your repair try a bottle of gas line antifreeze in the tank, it will disperse and dissolve any water.

Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

Never drive faster than your guardian angel can fly
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