Quote:
Originally Posted by x5Alpine
Hi, my 2003 x5 4.4i has a very high pitched whining noise coming from the engine bay when the key is turned to the 2nd position and I cant seem to find out what it is. Is this serious or will it be ok?, also, when I start the car it has a very loud knocking noise but then goes away and when the engine is running and there is a ticking noise coming from the front of the engine when its idling. I would greatly appreciate anyones help on this, Thanks!!!
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First of all how many miles on your X?
I'm assuming the engine is running when you hear the whining noise, it could be the secondary air pump, they a have a tendency to fail, but not a big deal you can still run the engine if that's the case. Does the whining noise go away after a few minutes? The secondary air pump shuts down after several minutes. If the engine is not running when you hear the whining noise then it's some other issue and we'll need additional information from you.
Initially when you start the engine you will here some loud ticking, for couple of seconds, until the oil pump pressurizes the oil system and starts to lubricate the cams. Now the ticking noise should be normal when engine cams and valves open and close, unless the sound is very loud, then it needs to be looked at.