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Hello, Mitchell shows rear O2’s only on California trucks for a Big Block ¾ ton 2000. Not sure how the rest of the country got away without rears but I’d bet your truck never had any rear sensors….

The car does have to be smoged but we test at 15 and 25 MPH not at Idle so I think it would be OK with the rich idle. Actually I just got tired of the smell when stuck in traffic. Around here if you...

Don’t know if anybody is interested or not but:

http://www.ls1tech.com/forums/showthread.php?t=670285

2% CO is about 13.7 to 1 AFR. A little fat for Idle......:phatyo: Thanks for the reply.

Changed the first post from CO to AFR......

Problem is the PCM is happy. It’s got everything right where it wants it to be, STFT’s are bouncing around 0, same with LTFT. Dashboard looks fine. I'm sure this is due to the camshaft overlap...

Thanks Perry, your right that’s exactly what I’m doing. Got a wideband so I could better judge the mixture, Started playing with the O2 switch points and gave it a bunch of timing. Tamed that cam...

My current OS does not use {B3647}. If I load it over OS3 I’ll assume I still won’t have a {B3647} to adjust. That’s cool with me but do you have any other suggestions on a parameter I could...

Guess I should have introduced myself before I started asking questions….:D I’m just regular gear head that has been playing with Chevy’s for most of my life. Not new to making fuel and timing...

Sorry if this has been covered before but I could not find exactly what I’m looking for in a search. What I’d like to do is keep the vehicle in open loop at idle say to about 1,200 rpm, then...