I'm a rookie tuner, but I've done a half dozen tunes successfully so far. This one is behaving differently.
Engine/Trans and PCM is from a 2003 Express Van. 6.0L/4L80E.
I've been chasing the SD Tune a lot longer than I should, but getting there.
I did a few full throttle pulls today. The RPM readings on the VCM scanner never go above 3400 or 3600 RPMs. Engine is revving fine. Can even bounce it off the rev limiter, but the scanner never reads it.
Snap-on scanner reads it fine, so it's not in the PCM. It doesn't seem to be an update-rate problem, but the longer I use the scanner the buggier it gets.
An increasing number of PIDs disappear from the recording. Eventually it locks up entirely, but I can live with that.
What I do need it to do though is log high RPMs so I can get my shift points and WOT fueling dialed.
Any suggestions?
Scan file and Layout attached.
AFR Error Layout.Layout.xml
wbwot3.hpl
Joe