Hello,

On my 2009 Cobalt SS Turbo, I just redid the timing and balance shaft chain, sprockets, guides and tensioner, valve cover gasket, new plugs and coils, LDK injectors, ZZP intake, Valve cover breather, S1 Map sensors and ZZP PCM tune. The car ran fine for a little while but then it all of a sudden started having a flashing engine light and noticeable misfiring on slowing down/idle. I plugged my snap on scanner in to monitor the misfires and it was misfiring in every cylinder except #1. A couple weeks later the car started to smoke like crazy (blue oil smoke) on idle and revs. It's very very thick smoke that was polluting the air heavily. Plugging the scanner in once again its still misfiring in all cylinders except 1. I tried putting a new set of plugs and coils and it's still doing the exact same thing. It still drives and makes boost fine, but I can't figure out the misfires and why it's burning so much oil.

 

What are all your codes

 

Valve cover breather? U sure u did timing right?

 

I assume he means this https://zzperformance.com/products/v...ther-version-2

 

Pretty sure that zzp tune, if its not a remote tune, does not take into account the valve cover breather. Ur car is probably idling like **** . why do you even need a breather? Do you have alot of crank case pressure?