1101 , 101 and 103 with driveability - Chevy Cobalt SS Forum : Chevrolet Cobalt SS Forums
 
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post #1 of 1 (permalink) Old 10-14-2017, 06:21 PM Thread Starter
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1101 , 101 and 103 with driveability

I have a question to all. Any replies are greatly appreciated. I just purchased a 2007 ss sc that was in severely rough shape mechanically. I will list all that I have done. So it started with timing chain set sprockets tensioner and guides. This made a considerable difference. But was just the tip of the iceberg apparently. Next onto MAP sensor , MAF sensor new computer, Upstream and downstream O2 sensors, welded crack in exhaust manifold, cylinder number 4 injector, fuel filter, and air filter. What is happening now is when trying to accelerate easy from a stoplight it will go into convulsions bucking surging its horrible if you pin it WOT when this occurs it comes out and runs beautiful. but once ur below 3k rpms again and begin to accelerate easily it all happens again sometimes real bad sometimes not as terrible. i have tested all sensors several times and am pulling my hair out on this one. We have driven with scantool on and watched for MAF and MAP to respond correctly and see if there are any dropouts all check fine. Upstream O2 also responds as it should.
Car is all stock to the best of my knowledge as I bought it second hand except for INJEN cold air intake


I also can not drive ins the rain it is so bad when it rains out it is almost undriveable. So frustrated any help would be great!!! Any known ground issues or harness issues?
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