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Originally Posted by a02ml500  The M55 motor is the electrical motor under the manifold and can be seen in the photos. It is the black plastic thing under the manifold. There is a easy way to check if the manifold flaps are binding. I took off the engine cover over the intake manifold and in between the openings (third and fourth cylinders if I recall correctly) you can see the M55 and the strut to the flaps. With the engine off and with a long screw driver, I pushed the M55 and strut towards the front of the car to simulate its operation and closing. The strut would not return to its starting position but would get stuck and had to be pried back to its position. Initially, we suspected the M55 inlet motor but once we removed the motor (this can be done from under the car and without removing anything else) it was clear that the flaps had resistance and were not smooth in operation. That led to the cleaning. Alternative is to simply replace the manifold, which comes with a new M55 motor. |
Hey , did your ECU throw any error codes while you had this problem? I have some trouble with boost, ECU throws all kind of errors about turbo wastegate but i very much doubt its that...
