C4 shifting very early
It's done it as long as I've had the vehicle, but it's never really bothered me, I just do it manually with the B&M Mega shifter. I'd like to sort it out though, as I may be selling the vehicle soon. It shifts up at around 1500 rpm, unless you really plant it, when it shifts at about 2000rpm.
I don't know if the vacuum gear was hooked up properly when the C4 was installed so lets start with the basics.....