Vanos seals causing stumbling and bogging at full throttle

[sullybmwm3]

My car has been experiencing these issues over the last few years. I hardly drive the car and thought it was the supercharger but read that it could be the seals on the VANOS. Anyone else have this issue and what was the fix. VANOS rebuild coming this summer. I will update once i figure out what was the issue with my car.

Sully

[Slideways]

Have you run a VANOS test with DIS/ISTA-D? That should give you an idea of how the VANOS is performing.

[Arith2]

Do a data log. See what your AFRs are, fuel trim, vacuum, and make sure you're using the gas you're tuned for. You have to have a custom tune for your SC so talk to whoever tuned your car. It's good to just rebuild your Vanos regardless of whether it's problematic or not.

[mrgizmo04]

I wouldn't jump to VANOS, but it's possible. You have few other issues going on - car is rarely driven and it's FI.

You read any codes? What mileage on the car? When did you go FI? Was it tuned properly? Was it running fine after FI/tune? Having issues for a few years is a long time. Could be fuel pump, etc, many things. What is status of other maintenance - plugs/coils/fuel filter and so on.

[0-60motorsports]

Do a VANOS test first and then read the codes from the car as well and post them up.