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  #1  
Old 03-16-2016, 07:19 PM
e36 e36 is offline
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Very loud "jet engine" noise from engine

Hi All,

We brought the e53 in for cooling system refresh and the car came back with a very loud engine noise. It does not sound healthy at all. Mechanic says "he did not cause the sound".

The items that were replaced:
-Waterpump
-Thermostat
-Several hoses


Here's a link to a video of the sound- https://youtu.be/-n0Nc4DQXIE

Any ideas?
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  #2  
Old 03-16-2016, 08:26 PM
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not good.............sounds like the timing is way off...........
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  #3  
Old 03-16-2016, 08:47 PM
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Sounds like W16
Anyway...do not disturb the car.... noise is ugly! Sounds like there is no exaust pipes! It is hard to say anything just from noise...sounds like may be one candle at least is not working if u know what I mean!
Ask...what they really did there!
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Old 03-16-2016, 09:09 PM
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Your mechanic sucks, find a new one, fast.
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  #5  
Old 03-16-2016, 09:36 PM
e36 e36 is offline
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I'm at a loss for words as to how this can happen from a water pump swap!!
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Old 03-16-2016, 10:20 PM
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I wouldn't drive it. Get it scanned and looked at by a good independent BMW mechanic.
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Old 03-16-2016, 10:42 PM
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There's an aluminum crossover pipe that connects the exhaust ports on the heads to the secondary (emissions) air pump. If it was left off or loose (or seals are missing) there would be an exhaust leak out the front of the engine. As you should imagine given the story here, that pipe has to be removed to change the parts you have recently changed.
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Old 03-16-2016, 11:22 PM
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+1^^^ What David.X5 says hits the spot
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Old 03-17-2016, 01:09 AM
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Quote:
Originally Posted by David.X5 View Post
There's an aluminum crossover pipe that connects the exhaust ports on the heads to the secondary (emissions) air pump. If it was left off or loose (or seals are missing) there would be an exhaust leak out the front of the engine. As you should imagine given the story here, that pipe has to be removed to change the parts you have recently changed.
I was worried about timing guide failure, but what David says above sound much more plausible... and bonus, cheaper.
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