chrleb2
August 25th, 2008, 12:14 PM
I have a customers truck in the shop right now. It is an 03 chevy 1500 and the stock tune is in it. The truck has headers and an intake right now. It came in because the CAT was dead on the driver side and getting even more plugged. I cut the cats for right now to test the motor. The plugs were fouled in it.
Right now I am having a misfire problem. It consistantly misfires on #2 and #7. If you give it throttle, it clears up and doesn't miss. I've changed the o2s, plugs, moved spark plug wires, injectors, coils, and checked the MAF. After all of this, it still misfires. Now for the wierd part, if i add global timing into it from the scan program, the missing goes away and fuel trims equal out close to 0. When missing the ltft's are 16-18 for the driver bank and 0 - .8 for the pass bank. This is driving me up the wall. The part that has got me wondering is the effect of added timing (10-12*) at idle.
Right now I am having a misfire problem. It consistantly misfires on #2 and #7. If you give it throttle, it clears up and doesn't miss. I've changed the o2s, plugs, moved spark plug wires, injectors, coils, and checked the MAF. After all of this, it still misfires. Now for the wierd part, if i add global timing into it from the scan program, the missing goes away and fuel trims equal out close to 0. When missing the ltft's are 16-18 for the driver bank and 0 - .8 for the pass bank. This is driving me up the wall. The part that has got me wondering is the effect of added timing (10-12*) at idle.