Quote:
Originally Posted by alphanumeric
the NOISE did go away after I disconnected the electro magnetic clutch wire thats in front of the valve cover near the super charger.
TRY this c230k owners. start your car up on a cold morning, set your parking brake to max, put car in reverse or drive, open the hood and walk over to the super charger and watch and listen to how ugly it sounds.
come to think of it. I have no idea why the supercharger would be engaged at normal driving (cruising at 35mph) RPM in the range of 1-2k. the S|C should be turned off. all I know is, the noise is gone!
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You don't have to put the car in reverse or drive for a cold start demonstration of the supercharger acting as an air pump - the car will do it with the transmission in park or neutral.
Cold starts are not the only time the ECU operates the supercharger in this way, I've also noticed it can happen at idle with a fully warm engine. It seems to happen most often if I coast to a stop at a traffic light. I'm betting the ECU realizes that the 02 sensor is cold since no fuel has been used in the coast down and it uses the aux air trick in an attempt to keep the O2 sensor warm.
As I said before if you lightly accelerate to 35 mph and keep the engine revs below approximately 2K the supercharger should never engage - you may have a problem with the clutch assembly.