For the past 6 months or so my AFR has always stayed between 11.8 and 11.4 during WOT. It bounced around a lot but still remained within those parameters. I just noticed over the past couple of weeks that my wideband is reading way rich during WOT and the AFR is bouncing all over the place. And it happens every time! As soon as WOT is engaged it goes straight to 11.5 and typically by the end of the shift it has worked its way down to 10.2. It bounces up and down between 11.5 and 10.1 with no pattern whatsoever. What gives? Any thoughts?

 

idk know where you live but with warmer weather it will prob run richer compared to when its cool out. Also what WB are you running? Can you recalibrate it?

 

if this just started happening out of the blue with no changes to the setup i would suggest calibrating and/or replacing the WB sensor and switching gas stations.

 

unscrew the wideband and wipe it off then put it back in. mine was doing something similar at one point and this fixed it.

if it does it at the end of 2nd gear, but not 1st, then your tune needs work. 1st gear is very forgiving on the tune since you run through the rpms so fast.

 

Its an autometer digital wideband. Whats a good chemical to clean the sensor with and not damaged the sensor. Also, right about the time a did the cam swap is when i noticed the change as well. It might have been a week later or so before I noticed, but thought i would throw that out their. Can all widebands be recalibrated? I don't know if mine can or not. Or at least I don't know how.

 

you didn't think the cam swap would require a tune change?

 

Had it tuned the same day I did the cam swap.

 

Something I was going to add that I noticed on the way to work this morning is when under WOT it hits 11.5, then slowly falls off into the 10's. But, when you do like half throttle when your at 1 lb. of boost or less the afr immediately goes into the high 10's instead of hitting 11.5 first.

 

what i'm saying is that you didn't mention any of these changes in your original post. its obvious you need to revisit your tune, you're hitting parts of the ve table that you never have before, but with the info in the original post we had no way of knowing that you just had a cam and tune change.

 

Well the thing is that the cam swap was far enough back, about 2 weeks ago, and I have not noticed it until the last few days. Now either I just have not noticed it for a week or it just started. I just can't honestly say that I have been watching it close up until now. Can you exlpain the ve table thing to me as well?