Wild AFR after cam install!!!
Wild AFR after cam install!!! I installed a comp xer273 (224/230 .581/.592) and it has poor throttle response at idle but great at about 3500. I installed a wideband today and the idle AFR was 19.9 and at 4000 it was 14.0. I assumed the car was rich and flooding at idle but it seems exactly opposite. Any ideas?
PS Ordered HPTuners should be here this week.
PS Ordered HPTuners should be here this week.
I opt for exhuast leak! Disable DFCO but I bet that isn't it. The AFR should be far leaner for DFCO. Mine pegs 50 I think.
Last edited by 2002_Z28_Six_Speed; Jul 3, 2007 at 07:10 AM. Reason: spelling.
I just moved the wideband sensor to the opposite header and got same readings of 19.8 idle and 14.9 at 4000rpm. Another idea i had was either a miss fire at idle or my car is a 92 camaro still with the stock fuel pump. The stock pump is a 44psi multiport fuel injection pump not an LS1. It worked fine with a stock LS1 so i assumed it would be enough to idle the cam. I got a Walbro 255 pump and HPTuners on the way, so something is going to change.
Fixed the problem. It was something pretty stupid. After I put the motor back in I forgot to plug in the alternator energizing wire. The alternator was not charging and the pcm was operating at low voltage. After I pluged in the harness the idle AFR was bouncing around 14.6
Congrats man. 
