AFR Erratic at Steady Cruise Throttle
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AFR Erratic at Steady Cruise Throttle
My a/f is fine WOT and PT but just cruising around but sometimes the a/f pegs out lean 17/1 at steady throttle in tc lock. If I blip the throttle it will return to normal but soon go way lean again. After a while it'll run 13's rich and then stoich again. All this at steady cruising throttle. All this started the day after the 4L80E swap. The only thing that changed other then the wiring was the drivers side exhaust had to be re-routed do to the deep pan on the 4L80E. Having the truck dyno tuned next weekend. Hopefully they will have some answers.
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First get that wideband hooked up to your scanner and do some Ve tuning with % AFR error (not by trims). Looking at your Ve LTFT histo, it appears a little off. I would then do the same for your MAF (using your wideband).
Did you by any chance have the A/C or the defroster on during these scans?
Did you by any chance have the A/C or the defroster on during these scans?
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I did have the A/C on. Is that was the timing dips are? I didn't think about that one.
I'll see if I can wire that wide band into my interface. I don't have the EIO version of HPTuners.
I'll see if I can wire that wide band into my interface. I don't have the EIO version of HPTuners.
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