29th April 2001, 21:12
Junior Member, warming up (<31 posts)
Join Date: Nov 2000
Location: Ommen / Netherlands & Pietarsaari / Finland
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Have you seen www.m5springboard.com
/ Useful info / ... Technical Bulletin? My flap makes only one, not two, test movements after start. Some other M5:s with well working flaps also do only one test movement.
My flap (3.6 l -89) did not work because the full throttle sensor was broken. After changing the sensor (~80,- Euro) my flap worked fine and I could notice a clear power step from 3/4 to full throttle at abt. 3500 rpm. If you suspect your sensor I can help you. I have documented the pins in a file including some comments. Just let me know (=your e-mail address).
Easiest check is to look at the actuator when you give full throttle from idle. I did not need to hit the rpm limiter before I could see the valve open.
You can also disconnect the vacuum hose to the actuator and take a ride. Do you feel the difference?
The actuator itself can be checked by sucking in the vacuum line. It should move quite easily.
Many people recommend to check the vacuum lines.