Hey Guys
I just ported & milled (.025) 317 casting heads on my LS1. The car fired up immediately after the installation then I shut it down. next day I tried to fire it up but the car haven't started until today "its been 3 weeks now!".
Pulled the spark plugs and they are black coated (rich), cleaned them and put them back but no luck. Pulled 10% from the VE between 400-1200 RPM but nothing.
The car pulled a dtc p1516 & p1518.
I want to know if this is tuning problem or ignition/mechanical issue however the car was fine before the new setup.
Ls1 bottom end, Truck intake, 317 heads & cam 215/223 112 lsa.
any suggestions?