I am tuning a 2001 LS1 Firebird A4---The owner bought the car with an aftermarket MAF--looks like a SLP---
Whats happening is that the computer never goes into closed loop---It starts in open loop as it should but never changes--The LTFT's are not reading so i can't adjust them---However when flooring it the AFR does change to the commanded 12.7 that I've tuned in--
I can't tell what the actual AFR is because the 02 voltages are not oscillating either and are stuck around .450 millivolts at WOT
Any ideas or suggestion where to look for a problem or where to start ????