BC P0303 Update - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
Problems and Service Talk about any mechanical problems you are having

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post #1 of 2 (permalink) Old 03-09-2019, 01:53 PM Thread Starter
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BC P0303 Update

Finaly managed to capture a few images of cylinder 3.
While they are not the sharpest images, they do show almost the entire 360 deg of the cylinder bore.
I did indeed closely examine the gap all around the piston head looking for signs of scoring.


You can see the deposits on the top of the piston are righ at 180 degrees apart.

Checking for blow by: I pulled the stock air plentum from the valve cover, air filter, and throttle body and had MC fire up the engine. Only nominal puffs of air consistent with all 4 cylinders was felt at the valve cover vent port. Holding the vent closed with finger for a few seconds, the case did not pressurize noticibly.

@Coby7 @MP81 @Parthros
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Last edited by 1966tbird; 03-09-2019 at 02:31 PM.
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post #2 of 2 (permalink) Old 03-09-2019, 04:00 PM Thread Starter
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Thanks for a quick reminder from Coby7 about soaking rings in a good solvent, I installed 2-1/2 oz of Hoppe’s #9 gun solvent down on top of the piston. Now to let the magic do it job. We will come back tomorrow and clean the cylinder and give it a drive.
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