Hi all, new around here and new-ish to HPT.
So I have a 2006 Cobalt SS with the LSJ engine. Mods:
TVS 1320 blower w/ 2.9" pulley
Siemens 80# Injectors
Shorty headers, catless downpipe
K&N CAI
Cooling mods
Most of the mods are new after doing some engine work. The car has new timing and balance shaft components, piston rings, head gasket, head has been worked over (resurfaced and valve job), new coils, new plugs (NGK 2667 gaped at 0.35"), and I think that's it. Everything else is stock (including the TB).
I've been working with a local-ish tuner on a E-85 tune (or really a E-70 tune because winter time here in Kentucky). By no means am I doubting my tuner, but I just would like a second set of eyes here. Since swapping the blower, injectors and going E...I've been dealing with misfires. Car is throwing 2 codes currently, P0300 (Random Misfire Detected) and P0017 (Crankshaft Position - Camshaft Position Correlation - Bank 1 Sensor B). Now I'm 99.99% positive the timing chain is timed correctly, and that the cam sensor housing is also set correctly. Both of those are pretty simple to do on this engine. The cam sensor housing I've set at least 4 times in the last 4 weeks just to be absolutely positive. Now I also think the previous owner did swap the crank sensor, but he never did a CASE relearn. I've tried twice to do a CASE relearn through HPT, but I'm not 100% if it worked. Still, I don't think this P0017 code would cause these misfires, or would it?
So with that said, I'm just running out of ideas here. Another set of eyes on my tune file would be greatly appreciated. I also have a log attached of the car idling at temp. You can see the car is idling about 300-400rpm higher than target, which is odd. Really looking for confirmation on the tune, or any ideas on what could be causing the misfires. Thanks in advance.