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TNVIPER said:Yep, wideband...
Normal driving mine jump from 14.X to 15.X...occassionally may bump 16-17....but this is normal.......my problem is it goes off the scale lean if I coast in gear then just hit the gas, not WOT but like starting up a hill...stays at 17+ for maybe 2 seconds then jumps back to where it should be....does this from idle too..
Sounds like your accelerator pump shot (programmed functionality in the ECU to mimic what an acclerator pump does, not an actual one) is too lean for your TB or for your injector size.
Or, your fueling table is off a bit around idle and low rpms. It could be that the short term block learn is having to correct it every time just right off idle. Maybe a slight tweak to your program is in order.
On long coast-downs, you should go extrememly lean, i.e., you should go into enleanment mode whereby it cuts all fuel completely. If it is not doing this ever, you need a program tweak. Is your program custom? The reason I ask is that it if you had an issue with throttle tip-in hesitation, your programmer dude could have removed the enleanment mode to try to mask the hesitation. --Just throwing some ideas out there.
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