Frank Martin
Mar 24

2003 x5 4.6is noise

3 comments

 

Weird noise coming from under the hood, maybe it’s the alternator but I want to be 100 percent sure, no check engine lights.

 

cnelson3103
Mar 26

Just as a safety check, I would check the water pump pulley for play indicating the seal/bearing has given out letting the impeller “spin against“ trying to shave the block inside. I had the exact metallic sound from one of my 740is and that’s what it was, the belt tension prevented the pulley from shifting while it was running so I didn’t see the pat until I pulled the s-belt. After pulling the pump, luckily I had caught It early, but it still was beginning to wear a groove into the block wall behind the impeller...

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Frank Martin
Mar 26

Thanks for the replay buddy, it ended up being the alternator which was going bad.

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cnelson3103
Mar 27

Lucky break on that one, just wanted to give you another base to check in case, glad to hear you found it...

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