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Originally Posted by highspeed
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Many years ago I had a similar problem with another brand of car (which I won't mention) and we later found out it was the ecu that was defective.
You might also want to see if the a/c is fully charged. My problems started with low freon and the clutch for the a/c engaging intermittently when a/c was on.
Later on the car's poor preformance was attributed to damage to the ecu. Don't know if the two were ever related but thats my experience.
BTW I ended up selling the fkn car.
Hope this helps,
Cheers,
Fern
well my 95 520i for the last 10 months is sending me bust please help.............it all started early last year a noise coming from the air con. pully with poor performance with the air con. on, i have since found out that the chattering coming from the air con area is causing the knock sensers to retard the timing with the air con on , when the air con is off the car goes A1, now ive had the car to two top line dealers with the following parts replaced at great expense 1st a reco comressor then the idle control valve then the idler pully then the automatic belt tensioner ,today i took the car back and got a brand new A$1300 compressor fitted with no change to the car, the noise coming from this area is getting louder yet my BMW dealers seem to be only guesing , please has anyone else experienced this problem ...HELP me fellow bimmer lovers 
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