2011 BMW X5 35i engine knocking at 2000 rpm only 66k miles on car

Quatro40 · #1 02-09-2016, 10:01 AM

This is my first and last BMW I ever buy, in only 5000 miles of ownership is just one thing after another. This sound started about 2 weeks ago but I just noticed it was that bad. But when idling and bringing the rams to 2000-2500 it is clearly a knocking sound. Engine hasn't been starved of oil and oil change was done about a month ago. No check engine light, engine otherwise is smooth, no hesitation, no power loss, accelerates strong.

Let me add that there is no white smoke, no oil leaks, check the seals around engine all clear.

It does that knocking after engine is warm, if I rev to 2000 rpm with engine cold it does not makes the knocking sound.

What you guys think this is?

https://www.youtube.com/watch?v=KO_upc4Op10

Then I saw this part today kind of vibrating, is this normal, I didn't have anyone to rev the car to see if it was coming from that part.

https://www.youtube.com/watch?v=KO_upc4Op10

Pierce330 · #2 02-09-2016, 11:41 AM

Is it a CPO by any chance?

Quatro40 · #3 02-09-2016, 11:44 AM

No CPO )-:

ZetaTre · #4 02-09-2016, 03:24 PM

I'd start with something simple: check that all spark plugs are torqued...

Pierce330 · #5 02-09-2016, 03:46 PM

Quote:

Originally Posted by ZetaTre

I'd start with something simple: check that all spark plugs are torqued...

+2, however, did this issue start overnight? If so, then start with the basics. When I first read the post, I assumed it may have been misfires.

json · #6 02-09-2016, 07:40 PM

I would also start with making sure all spark plugs are tightened.

The belt tensioner is unlikely to cause a noise like that.

gregg3gs · #7 02-09-2016, 08:04 PM

It does not sound like a spark plug issues.....

I agree with your second video:
https://www.youtube.com/watch?v=t5XUbeCVbCc

I think your serpentine belt tensioner is bad and needs to be replaced.
Is anything else loose on the belt assembly?

Quatro40 · #8 02-10-2016, 12:15 PM

Quote:

Originally Posted by gregg3gs

It does not sound like a spark plug issues.....

I agree with your second video:
https://www.youtube.com/watch?v=t5XUbeCVbCc

I think your serpentine belt tensioner is bad and needs to be replaced.
Is anything else loose on the belt assembly?

Nothing else is loose, bringing it to get fixed on Friday. At least the belt tensioner kit is not expensive only $150.

boostedX5SAV · #9 06-04-2016, 12:16 PM

Quote:

Originally Posted by gregg3gs

It does not sound like a spark plug issues.....

I agree with your second video:
https://www.youtube.com/watch?v=t5XUbeCVbCc

I think your serpentine belt tensioner is bad and needs to be replaced.
Is anything else loose on the belt assembly?

I notice mine is shaking like this. Did you get it fixed or is it normal to for this part to shake like this?

Quatro40 · #10 06-06-2016, 10:17 AM

Quote:

Originally Posted by boostedX5SAV

I notice mine is shaking like this. Did you get it fixed or is it normal to for this part to shake like this?

Yeah is normal to move like that, now if you hear the diesel rattle from the videos then you need to bring it to the dealer right away as your VANOS is failing.