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I gave that a go.

I'm still getting the spike randomly. It now appears to be more stable during transients while in PE.

Prior to changing coeff's to 0, for example, it would go really lean...

This is driving me crazy...

This is the factory setting for the zone map boundaries. In trying to understand how these work, I haven't seen any examples with different values for MAP zone 0-1...

I've now read over this a number of times. And think I now grasp what you are saying. How did you log which zone you were in? and what logic did you use in changing them?

I up graded to the custom os so I have the classic ve tables. And it happens at different map values. The only thing consistent is it happens 2.xx seconds after pe is enabled. I do log fuel trim cell...

What do you know. I changed back to VE only and set pe to enable at 255Kpa, dumped in 1.22 for the values 100kpa + in the airflow gain table and the spike is completely gone. What is the downfall in...

Beat me to it. Looks like it is a base pulsewidth...

Also, no I do not believe it is misfire.

Just finished adding these. Will log some tonight.

May start working on the airflow gain tables though. Seems like the OP has tried just about everything.....





Yes it is dead...

Files Attached Below:

54283

54284

54286

Attached is a log + config and my current tune. I'll gladly paypal anyone who is willing to spend their time to figure this out.

I went back to my VE only tune. Much less pronouced but still there, sometimes. Didn't seem to be consistent on time either(always around 2.xx seconds though). Working on disabling PE all together...

does your rpms drop when the lean spike happens? Mines does. appears to be happen at lockup for me? I never had this issue prior to the 4l80e swap I just finished btw. Do you guys also have the ISS...

I'm in the same boat guys...sub'd.