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  #1  
Old 12-27-2012, 08:53 AM
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Engine has a strange sharp noise, should I be worried?

Hi I got a 06 X5 4.4i with a N62 engine. Recently I noticed when the engine's running there's a high pitch tone which wasn't there before. It's not very loud, can't hear it at all from the cabin, but when you open the hood it's pretty obvious. I wonder if that's something I should be very worried. This is an old truck now and if the engine breaks maybe it won't be worth to fix it. Is there any way I can upload a sound file like MP3 to this post? I have recorded the sound using a voice recorder. Maybe you guys can help me out and point me to the right direction. The thing I fear most is the timing chain. Read a while ago that the guard rail for the timing chain is made of plastic material and tends to break. Have anyone replaced the guard rails? Is this a DIYable job or must be done in the professional shop? How much it would cost? I can also try to sell the car now but I feel unethical to sell it unfixed.

Thanks.

Will try to find out how to upload the sound file later. If not I'll just shoot a video and upload to youtube since there's a youtube button here.

Happy holidays!
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Old 12-27-2012, 09:10 AM
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i suspect that your suspicion is correct.. if this is not vacuum hissing, it is probably the chain guide rails...
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Old 12-27-2012, 09:18 AM
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Thanks terminator! Do you know approximately how much it will cost to get it replaced at a professional shop? The dealer is not too far away but they always charge me way too much even for a small job. Thanks again.
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Old 12-27-2012, 09:26 AM
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the parts are couple hundred bucks... the labor to open up engine?... that can be expensive... i do not know how many hours it would take but would suspect at least 10 hours, if not 20... there were people here who had done this, lets see if theyv will pitch in...
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Old 12-27-2012, 09:50 AM
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Wow, sounds like $2000+ job. Labor charge at least $1500. So if you DIY, you have to lift the engine out and open it up? Guess I have to go to a shop for this kind of job.
By the way, is there a easy way to find out whether it's the guard rails or not? If I drain the oil and take off the oil pan, should there be some guard rail debris in there?
The noise is more like a high pitch "hiss".
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Old 12-27-2012, 10:08 AM
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Without hearing it I really can't tell. Bad water cool Alternator($950)? That was my case a few years ago. It also could be those pulleys too. water pump...
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Old 12-27-2012, 10:19 AM
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bulkwarrior, post a sound clip. There's no way to accurately describe sound with words.
I'm not familiar with the N62 engine but I don't think you need to lift the engine out for this job. You do have to open up the front end though. If it indeed the guide rail, you will see debris in the oil pan. GL!
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Old 12-27-2012, 01:03 PM
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just shot a short video with my phone. here it is


high pitch noise when bmw x5 4.4i engine is runnin - YouTube

Please let me know what it sounds like. It's snowing today so I have to drive this car, but I'll try not to drive it too often.
Thanks.
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Old 12-27-2012, 01:07 PM
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Maybe it's just a serpentine belt or something(does this car even has a serpentine?)
I used to have an old car whose serpentine belt squeals in the winter, and it sounds a little bit like that.
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Old 12-27-2012, 01:30 PM
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Take the soundcover off and try to pinpoint where the sound is comming from. It Sounds like a serpintine-belt or the bearing in one of the pulleys.

(if your 06 is an old truck like you say than mine is a dinosaur )
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Last edited by Koody; 12-27-2012 at 01:31 PM. Reason: grammar
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