Hey guys. I have been tuning my cobalt for years. I've had it since 07. Last summer I had a mishap in a large puddle and decided to rebuilt the top half of my engine after finding rust on the cams. I have zzp stage 2 cams now with 78# springs. I also have 60# injectors and a full 3" exhaust and an aftermarket intake.
I never had problems before with startup and or knock. Now I can't get rid of either problem. I have tried playing with timing and fuel and constantly have about the same knock. I just changed both axles and front bearing with no help.
Also my start up is a mess. It usually isn't starting the first time around. And I think I now have a chipped tooth on the flywheel from misc bad starting. I just had a new clutch put in this year as well. Basically an upgraded oem one.
If there any advice on what that knock could possibly be? (I am going to seafoam clean this guy soon I hope.)
Also any advice on a tune that would make start up work better would be great. It almost seems like it isn't spinning fast enough or something. My spark plugs are fine. (one step cold ngks.) And it back fires a bit after a failed start up.
I have included my tune and the latest scanner results. Thanks in advance for any help. This has been aggravating me for over a year now.
I would go as far as even paypalling the individual who can remedy my problems. Well worth it.9-29-14.hplcobalt2014.54startupwork.hpt