I've adjusted the new VM a total of 3 turns in and it hasn't stopped the flair shift from 2-3. The flair shift wasn't happening until I replaced the VM, but after testing again last night, the flair happens even when I manually shift. Does this still sound like the VM is the cause? What are the recommended next steps?
Back to old non adjustable VM?
Band adjustment?
Sam
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Since the shifting issue started with the new modulator and you are not able to make any difference adjusting it, I would suspect the modulator is bad or possibly the vacuum source - broken hose, unhooked by mistake, ??
Typically the vacuum line is primarily steel with short rubber ends to make the bends and connect. I would check the line thoroughly for cracks, breaks, etc.
In my experience with modulator valves, 1/4 turns at a time make noticeable differences so if your up to 3 full turns and nothing is happening, something is wrong IMO
You could try the old one again as a test to see if anything changes - if yes, I'd say the new one is faulty. If still no changes with the old one, something else is going on.
You can adjust the bands pretty easily but I probably would not until you've ruled out the modulator as being faulty - too many changes at once can makes things harder to diagnose and confusing for yourself.
If you decide to make band adjustments, there is a procedure on how far you back the screw out on Low-R (passenger side rear) & 2-3 (driver side front) depending on what's inside. Stock or factory configurations are 'X' and C4s with shift kits installed or other performance work is 'Y"
Shift kit configurations I've installed are normally as follows:
Low-Reverse:
► tighten screw down to approx. 120 in lbs. then back off 3 turns, tighten nut while holding screw in position
2 - 3:
► tighten screw to approx. 120 in. in lbs. then back off 1 1/2 turns, tighten nut while holding screw in position
stock C4 probably something different.
if you haven't changed the bands though, I wouldn't think they need to be adjusted just due to replacing the modulator. I think something is up with the modulator itself or the vacuum source.
DJs74