Thanks. I will check that boot and other intake components for a leak as soon as I can.

Any thoughts on the TPS sensor? Live data of the Absolute TPS position just doesn't seem right to me. Again, here's what is happening:

TPS is at 0.0% when at idle. When not in gear, I would expect the TPS % to smoothly follow the accelerator pedal as I step on it. Instead, a change doesn't register until I push the pedal halfway down and the RPM's are pretty high, at which point the TPS % will be in the teens but not steady. If I peg the pedal, I can briefly see the TPS % in the 90's, but it jumps around.

I took the car out for a test drive and watched the TPS%. It does change and I can see it occasionally in double digits, but I couldn't see any linear pattern.

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cmelkoni
2003 X5 3.0i, manual