Quote:
Originally Posted by trd5004
I've been having this same "chirping" noise in my 2006 325xi. I've replaced the tensioner unit and idler pulley and I'm still getting the noise. I also put a new belt on when putting these new parts in. It only does it for roughly 10 seconds when I start the car, goes away, then comes back at lower speeds mostly when I'm not accelerating. I don't have any fault codes showing....does anyone have any advice for this? I don't want to replace all the pulleys if I don't have to but this sounds is driving me crazy!
|
That could be a bad pcv valve stuck open. Causes excessive vaccuum in the crankcase from the intake vaccuum, especially at idle or deceleration. The excessive vaccuum causes air to be sucked through the front or rear main seals making that noise. Mine currently has this problem and I'm waiting for cooler weather to replace the valve cover (integrated pcv valve on the n55)