Engine Idle Noise 3.0i Pre facelift Updated Pg 3

D

DaveRom

Member
 South Yorkshire
Hi,

Would it be possible for any 3.0 owners (pre facelift) to confirm whether or not their car sounds like the ones in this link please. It's a problem i've been experiencing since i've owned my Z4. I had the oil pump changed back in January and the noise went, but it seems to be back again :headbang: .

There are a few videos on this link where people are experiencing the same problem. If the engine is supposed to sound like that then i'll have to live it, however it does sound shabby and not something i'd expect from a BMW.

All videos in the link are 330's i think but have the same engine as the Z4.

All comments/help are appreciated.

http://forum.e46fanatics.com/showthread.php?t=674351

Thanks
 
Can't say I recognise that sort of noise from mine.
Just started it up to be sure and it made it for less than 2 seconds until everything was presumably up to pressure inside the motor.
From then on silent.

3.0i prefacelift

(I only tested it as I'm about to get on a plane and would be thinking about it otherwise and wondering :) )
 
Could be lots of things.

Is it definately front lower end noise?

I'd put a quid or so on it being a bearing in one of the ancillary belts roller tensioners.


Worst case it sounds a bit chainy. Deffo remove belt and run, if it stops, easy to fix. If not then it's in the crank case I'd imagine.


Certainly don't have that on mine from front bottom end. My disa made a similar noise but that was up top obviously.
 
Thanks for taking the time to reply.

It's a strange one. It only happens when its fully warmed up. Some days it sounds louder than others. I could let the car tick over with the nose pointing downhill and the noise would not be there. If i had the front of the car pointing uphill then it produced the same sound as in the video's.

Luckily i've got the BMW comp warranty. I may just take it back to Sandal. They've been pretty good with me in the past but i've a £100 hit to take if i have work done under warranty. A few months ago one of their technicians said it was the sound of the oil pump in the sump but with other people saying their cars sound nothing like that it's causing me concern. It definitely didn't sound like that when i had the new pump put on in January.

If i get chance this week i'll check the pulleys and the DISA. If it's neither of those then its one for the dealer to fix. It may be a bit more complex than just changing the oil pump this time.

Thank again
 
The warmness/pitch making a difference is odd.

I'm guessing the oil pump is chain driven off another chain drive. Maybe the chain is rattling a bit when the oil pump load changes (which it will as viscosity changes with temp and pitch changes flooding the pickup area more or less for the pump)

Odd one, but worth a check under warranty I rekon because if it is oil pump related and has been tampered with before, chances are it is still that!

Dave
 
Did anybody get to the bottom of this problem. My dealer is in the " wait an see if it gets worse " mode! or is that a " wait until the warranty runs out mode? _ I don't really fancy something letting go at 6k.
 
Anyone else reckon this could be the oil-pump 'nut' issue?

That can come loose and then the sprocket will move around a bit and rattle?!

End result is total engine failure. Probably worth a £150 ish for an inspection (sump removal/refit) of the pump/sprocket nut and replace/rectify where necessary!?


Dave
 
Hmm strange one this! All these videos are on Idle only - what happens when you give it a few/lot of rpms?

Definitely seems like one of the ancilliary pullies isnt at its best. Failing that it could be the starter motor stuck engaged? Mine, like CJ's seems to make this kinda noise for around 1 sec on a COLD (Below 14C) morning and i think my starter solenoid is sticking a little...
 
have the same on my 2.5i, dealer replaced all the belts and wheels in front of the engine :? noise still there... let us know how you proceed
 
OK, after changing the oil to Castro Edge Sport Ow40 the noise went away but still can be heard slightly in the background. A possible Vanos issue as Vanos is operated by oil pressure? :/
 
What's "Vanos" please?

Mine still sounds like an old Ford fiesta on tickover - but only when warmed thro'.

Do the dealers not have a link to a BMW Tech department these days? Surely they must have eh?
 
ronk said:
czechT698 said:
:hijacked:
Click to expand...


Can't ask the dealer to investigate "vanos may be making the noise" if I don't know what "vanos" is!

No hijack intended
Click to expand...

Just a little joke :) The reason is, I have been monitoring this noise issue around different BMW forums and in cases similar to mine the noise is coming not from the Vanos "bulb" located at the upper position of the engine but rather from the bottom where the crankcase is. Not to mention that the noise went 90% away when I schwitched to Ow40 (or 5W40) Castrol Edge Sport over the 5w30 Syntec or SLX they put in normally. This new oil has a bigger viscosity, meaning that it absorbs metalic shocks (when heated) much better than the standard oil, leadin me to belive that the problem might possibly be in the crankshaft (noise seems like to metal pieces are hitting or rubbing each other and the crankcase is where the noise is most evident). As to what extent oil pums is involved, I don´t know where it is but I noticed that the "ticking" or "rattling" noises were much more louder when the nose of the car was pointing upwards (eg. standing at idle on a hill). As for all the belts and wheels positioned in front of the engine, I already had all of them replaced with no effect at all. Hope this helps... :) Anyone have an idea where the oil pump is located?
 
Is the oil pump drive off it's own chain from a crank drive sprocket, or is it sharing the cam drive sprocket/chain?

It sounds like the pump/pump drive is noisy, and chains do rattle. I wonder if the pump one has a tensioner, like the cam one, which removes the slack?

Or, that oil pump sprocket running a bit loose?

I'd have the sump off and have a look if I were genuinely worried though. It's definitely in there where the noise is, if oil viscosity is having an effect.

Dave
 
Mr Whippy said:
Is the oil pump drive off it's own chain from a crank drive sprocket, or is it sharing the cam drive sprocket/chain?

It sounds like the pump/pump drive is noisy, and chains do rattle. I wonder if the pump one has a tensioner, like the cam one, which removes the slack?

Or, that oil pump sprocket running a bit loose?

I'd have the sump off and have a look if I were genuinely worried though. It's definitely in there where the noise is, if oil viscosity is having an effect.

Dave
Click to expand...

I have no idea :( I came across this on another forum where they were discussint he same problem on their M54 B30/25 engines. I will attemt fo find it during literature class tommorow but it mentioned something realated to air getting into the hydraulic lifters.... Solution was : rev the car for 3 minutes on neutral, if noise not gone do again... :) will give that a go next weekend, nothing to loose IMHO :) A M54 cutout would sure come in handy...
 
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