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I installed a 4L80E and a new converter and noticed an issue on the highway. Sometimes when I let off the throttle I will get a very lean spike, almost like the engine it trying to die, but it will catch itself. Sometimes it happens many times in a row. It is more common after some medium-heavy throttle.
Fuel pressure looks good, but the IBPW drops very low causing the lean spike. And ideas where to look in the tune for a cause?
I had a T56 before and it never did this.
Hi Mike.
I would first check all of your DFCO settings.
Also log G/CYL to see if there is a glitch in the airflow model causing it to command such a small pulsewidth.
Mick,
DFCO is disabled at the moment.
I'll log airflow tomorrow morning.
Here is the log that screenshot came from. It's mostly trans PID's.
No worries.Quote:
Originally Posted by ferocity02
Send the tune file through to my email if you don't want to post it up.
Durrrrr. DFCO was enabled. I had disabled it in different tune to work on the VE table :wallbash: