E91 2000rpm vibration

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Mitch
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Joined: 21 May 2015, 08:24
Car model: E91 318d

E91 2000rpm vibration

Post by Mitch » 21 May 2015, 09:55

Hi All,
I've just purchased my first BMW, A 2010 E91 318d Auto. It has 90,000 miles on it but has a full BMW history.
The car is excellent other than it seems to have a resonating vibration when you accelerate and are in the region of 2000rpm under load (and when stationary). The noise is not there once maintaining a constant speed.
The garage I bought it from (non BMW franchise) Have had it up on a ramp and thumped and shaken everything under the car to see if anything was loose or any tray fixings were missing.
It all seemed to be there and nothing looked out of place. The heat shield under the boot had a bit of a rattle when thumped but didn't seem excessive.

Before I get under the car and start poking bits with a stick (whilst car is revving) does any one have any suggestions.

The noise seems more pronounced on the passenger side and can be heard in the back as well as front.

Many Thanks

Gaz

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M60NJP
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Re: E91 2000rpm vibration

Post by M60NJP » 21 May 2015, 10:04

Always hard (impossible) to diagnose any odd sound without being able to hear it! Any chance you could upload a clip of the sound?

The possibilities are many!

Mitch
BMW Enthusiast
Posts: 10
Joined: 21 May 2015, 08:24
Car model: E91 318d

Re: E91 2000rpm vibration

Post by Mitch » 21 May 2015, 10:28

HI, Thanks for the reply.

Will have a crawl about this weekend and try for a video clip of the issue.

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M60NJP
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Re: E91 2000rpm vibration

Post by M60NJP » 21 May 2015, 10:30

I'm wondering if the EGR valve is sticking.......but you can't tell that from a visual inspection!!

Mitch
BMW Enthusiast
Posts: 10
Joined: 21 May 2015, 08:24
Car model: E91 318d

Re: E91 2000rpm vibration

Post by Mitch » 22 May 2015, 08:35

I did a little investigating last night. I may have found a possible cause which I am to work on this weekend.
It appears the top plastic engine cover was not properly seated at the back. It has 2 tongues at the rear which slide into slots under the windscreen area. These seemed not to be seated fully which was allowing the cover to resonate at certain RPM. The cover was whipped off and I went for a drive. It was a lot smoother without the cover. I returned home and refitted the cover correctly. It seemed to vibrate less. So last night I was a lot happier.

Upon starting the car from cold (It's a noisy thing when cold, you can here timing chains and pulley noises slightly over the engine until it warms up, is this normal??) it was found that the engine cover still rattled a little. This time my efforts were directed towards the front push in fasteners of the cover which did have a little play in them, If you placed your hand on the cover when running it makes it a lot quieter. I am to modify (space with silicon sleeves) the front fixings to take up any slack.

There was also a bolt missing from where the air duct, belt shield fastens unto the front cross member allowing slight play in this part. This will get re-bolted tomorrow.

I will keep you folks up to date on whether these 2 small annoyances disappear.

Thanks for reading.

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M60NJP
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Re: E91 2000rpm vibration

Post by M60NJP » 22 May 2015, 08:38

Well spotted! Hope it sorts the issue out for you............cheap fix too!

Mitch
BMW Enthusiast
Posts: 10
Joined: 21 May 2015, 08:24
Car model: E91 318d

Re: E91 2000rpm vibration

Post by Mitch » 26 May 2015, 14:42

It seems the problem is still there when the car is cold.

After much investigating it seems the car may well be suffering from a tensioner belt pulley issue. Apparently the curse of all BMW engines.

It squeaks and rattles line a chieftain tank when cold. The vibration could well be relating to the tensioner pulley. It' booked in next week at the local BMW dealership, it's still under warranty so will wait and see.

The radio reception is hit and miss.

Another known fault is the radio signal booster which is located under the spoiler on the tailgate. It gets wet and needs replacing. Again not planning to pay for this either!

Will let you know how I get on.

Mitch
BMW Enthusiast
Posts: 10
Joined: 21 May 2015, 08:24
Car model: E91 318d

Re: E91 2000rpm vibration

Post by Mitch » 04 Jun 2015, 16:44

Today the car has been in at a BMW dealership.

They have found fault with the car but its nothing I was expecting.

Apparently the vibration is caused by faulty fuel lines and this is not covered under BMW extended warranty :-w

I'm guessing someone will come along in a minute to explain how fuel lines can be so vocal?

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M60NJP
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Re: E91 2000rpm vibration

Post by M60NJP » 04 Jun 2015, 16:46

Mitch wrote:Today the car has been in at a BMW dealership.

They have found fault with the car but its nothing I was expecting.

Apparently the vibration is caused by faulty fuel lines and this is not covered under BMW extended warranty :-w

I'm guessing someone will come along in a minute to explain how fuel lines can be so vocal?
I hope so - I'm wondering the same!!

Mitch
BMW Enthusiast
Posts: 10
Joined: 21 May 2015, 08:24
Car model: E91 318d

Re: E91 2000rpm vibration

Post by Mitch » 10 Jun 2015, 08:15

The latest news is, after spending 4 days with BMW I've got her back.

A high pressure fuel hose has been replaced and much to my amazement this was the item which was making all the noise. The car now runs quietly throughout the rev range. Result!

The work was paid for by a non-BMW dealership who sold me the car a few weeks ago.

Glad I didn't take a punt and get the vibration damper or serpentine tensioner done as this would not have cured things. I might do them soon anyway as she has 93K on the clocks.

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