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Munzy123

530D N57 ticking noise on shutdown

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Hope everyone is well, been a while! 
 

Developed a ticking noise on shutdown of the engine. Sometimes get a metallic click as the car cools down after a drive bit this is much louder and definitely a new noise. It happens after a drive or even in the morning if I start the car and shut it down straight away (as in video) so nothing is getting hot enough to need to cool down.  
 

I’ve had a quick Google and seem some mentions of a gear actuator - a small plastic gear that can shed some teeth - sounds very much like a plastic gear/cog that’s skipping but can anyone shed a more definite light please? 
 

I’ll plug the Foxwell in later on to look for codes but nothing has come up on the dash or settings warning (yet!). 
 

 

Edited by Munzy123

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It's the throttle valve I suspect which closes on shutdown to hard stop the engine suffocating it of air, probably worn gears as you have stated. Someone else posted about this a few weeks back.

"Explained: Why Diesel engines need a throttle body & throttle plate - Team-BHP" https://www.team-bhp.com/forum/technical-stuff/188332-explained-why-diesel-engines-need-throttle-body-throttle-plate.html

Main reason for having a throttle body on a Diesel is EGR and it also has a role to play during engine shutdown. When engine is turned off the valve closes and cuts air into the cylinders this helps to achieve a relatively smoother shut down. Throttle body works as an Anti-Shudder Valve (ASV).

Sent from my SM-G996B using Tapatalk

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Throttle Valve indeed! 
Thanks again @percha and @Greenfingers

I’ve had the throttle valve body off before when doing my glow plug controller. The only tricky part was the third bolt underneath but hopefully a simple in and out job. 
Will get a new rubber seal too.  
(swirl flap code has been before, will clear it) 

Edited by Munzy123

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On 6/12/2021 at 6:00 PM, Munzy123 said:

69635C35-B5E2-4E5C-80FD-2966A391A30E.jpeg

 

Have you ever had the intake off to be cleaned? This is probably the cause of this error I would have thought.

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Throttle Valve replaced with a new one. 
 

£182 from eBay. I like to try and use BMW parts but at over £450 I decided against it and was pleasantly surprised when the part arrived in a nice Continental branded box. Not sure if they are OEM but have always like their car and bicycle tyres! 
 

https://www.ebay.co.uk/itm/NEW-GENUINE-VDO-A2C59514305-THROTTLE-BODY-WHOLESALE-PRICE-SALE-/153125024819?_trksid=p2349624.m46890.l49286

 

Taking the old one apart confirmed exactly the same problem as @Greenfingers reported, namely stripped gears. 
Lots of soot build up on the small white gear may have contributed to poor meshing on what is a sealed unit - oil and crud will always find a way! 
 

Car is a N57 on 125,342 miles, had a look up inside the air intake with the throttle off and it’s pretty coked up with soot/deposits.
I’d love to do the job @Matthew Ashton did and clean it but not sure I’m committed enough to do the job myself. May get it into a local specialist for a walnut blast while it’s off to be cleaned. 
 

Anyway huge thanks to the guys above and the forum for helping diagnose and fix the problem saving hundreds of £££ :) 

7C6F9751-C5A4-4C50-9FDB-0FEEE25B2789.jpeg

490B75CB-6CD3-41F6-BA28-438091079FA1.jpeg

Edited by Munzy123

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Continental are a good OEM supplier for BMW, waterpumps, belts, you name it, it can be made by them for BMW.  I'd fit Continental stuff to the engine without hesitation.

 

It just a pity Continental tyres aren't as good as they used to be IMHO.

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Well done on getting it sorted @Munzy123, and for sure Continental are a premium brand when it comes to most items including actuators on a diesel engine! At 125k thats not so bad considering how much that actuator is used (DPF Regen) and everytime at keyoff, then throw in the soot and carbon buildup its done well.

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Good man Munzy. Sorry I missed your question on the other thread, but glad you sorted it out ok.

 

Interesting to see that yours failed at around the same mileage as mine; I reckon that oil and soot contamination is partially responsible - damned EGRs again!

 

Out of interest, did you note which way round the 'C' profile rubber seal was fitted in the groove in the intake pipe? I foolishly took mine out to check it's condition and was then unsure which way to put it back. My experience in hydraulics taught me that the open side of a cup seal always points to the pressure side, but of course this should be reversed in a vacuum situation, so I faced the closed side towards the vacuum.

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