19transam81

Ok..... so, i installed my wide band air to fuel ratio gauge from PLX devices today. I need to know what you guys think is going on here. I put a C.A.I. on my car(ss/sc 2006) and i threw the code that says i am running lean on bank one. I also have two crankshaft positioning sensors. Since the codes wont clear I have the check engine light still on. My A-F gauge says at idle i am at 14.5-14.7. Now when i get on it the gauge reads 12.3 for a thousand rpm or so and it starts to go lower in numbers. By 4000RPM my gauge is reading 11.7. What do you guys think? I thought that 11.5 was great for W.O.T. If that is true why an i throwing the lean bank one code? Is anybody thrown any crankshaft positioning codes.

LopsidedJester

your afr seems to be alright, actually seems a little more consistent that mine. Are you running stage 2? at idle mine fluctuates from 14.5-15.6 and when doing runs it shows around mid to low 11's which is same as yours. so your AFR is A-ok

I think your CAI is causing the code to be thrown for some reason, make sure all connections are air tight and clear the codes and maybe it will learn the conditions. It may be a pain, but cleaning the MAF might help as well since a new CAI could spit some oil on the MAF.

What CAI did you install and did you disconnect the battery so the car could get used to it?

Red2.4SS

Your A/F ratio does not sound like a problem.

14.7 is "stoich" or the happy place for the catylitic conveter to do its job. That is fine at idle and normal cruising.

What are your long term fuel trims? If they are having to add more than about 15-20% more fuel than expected, you get a system to lean code.

As for the CPS codes you may need to do a CASE relearn. What is the code?

19transam81

I have the cobalt addiction stage 3(42lbs injectors, 2.7, and tune.) and the cobalt addiction C.A.I. As far as the C.S.P. codes go it was a C.S.P. not learned and one other one that i cant remember. But today it was 28 Degrees outside and in forth gear i only dropped to 12.2 A/F/R. If i just go half throtle my car doesnt really ritchen up. Should it?It pretty much stays at 14 A/F/R. An experinced HP Turner guy is tuning my car. But, ill be the first cobalt he has every done. I just want an idea of what it should do.

Pete

Is there any way to know what exactly the problem is

Pete

It's a 2005 Cobalt SS supercharged it has the two codes p0172 p1101 in the morning when I start it it's got rough idle jumping back and forth for about 3 minutes then it runs smooth my question is what is the normal MAF sensor readings at idle mine's at 4.3 gs once the engine is warm