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      10-12-2019, 05:19 AM   #67
thescouselander
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Just seen the video. Sounds to me like knocking so I'd second the injector idea. In modern systems the diesel is injected in several pulses which helps to reduce noise - could be that a faulty injector isn't getting the initial pulses right which would cause more diesel knock later in the cycle.

Could be difficult to diagnose though - probably a diesel specialist job.
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      10-12-2019, 06:56 AM   #68
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Rather than assuming and guessing what the problem might be, why don't you get a diagnostic lead for £10? The software is a free download.

For £10 you can at least narrow down the issue.

A diagnostic tool is a must have especially considering how cheap you can get them.
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      10-21-2019, 12:14 PM   #69
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UPDATE: Took the car to German Auto Works at the weekend. Had a call today saying the Technician has taken a look and wants to dismantle the front end as the car is reading -40 Degrees. Which is correct, but it has been like this since I got it. Numerous sensors later I was going to chase the wiring in my own time.

Bit gutted thatís all theyíve come up with tbh! Apparently sounds normal, which again is worrying? It did drive fine to the garage little loser but probably not as loud as the video. Donít think the outside temp sensor would cause it sound that way surely? Told them itís a red herring I think and heís going to take another look tomorrow!
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      10-21-2019, 12:44 PM   #70
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Is your car's name "little loser" now or did you mean its running looser...? 😉 Thanks for the update. Multiple temperature sensors in there but could be related to electrical gremlins elsewhere.
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      10-21-2019, 12:47 PM   #71
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My bad was on my phone! Meant to say it was a little quieter! Letís see what happens!
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      10-21-2019, 04:10 PM   #72
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I had a coolant temperature sensor go wrong on my car, looking at the hidden menu it would fluctuate between normal readings and -40. When it was giving the wrong temperature the car was mental!

As fuel injection is a closed system, fuel quantity determined by various sensors the car really thought it was -40 and would increase the fuel injected - a bit scary when accelerating and the car almost surges forward!

Would have been keen to see what effect it had on a rolling road!
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      10-22-2019, 07:14 AM   #73
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Quote:
Originally Posted by bishbosh View Post
I had a coolant temperature sensor go wrong on my car, looking at the hidden menu it would fluctuate between normal readings and -40. When it was giving the wrong temperature the car was mental!

As fuel injection is a closed system, fuel quantity determined by various sensors the car really thought it was -40 and would increase the fuel injected - a bit scary when accelerating and the car almost surges forward!

Would have been keen to see what effect it had on a rolling road!
Not surprised at your comments.

I'm also thinking fuelling and combustion. Temperature sensor is a must have, for correct running. Glow plugs and controller are also integrated, to ensure complete combustion.

When there is a fault, like a temperature sensor issue, how it runs will be also influenced by the actual ambient temperature.

OP needs to eliminate the obvious, then see how it runs.
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      10-22-2019, 09:00 AM   #74
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If you say it's always read -40 then I think this sensor would not be related to the engine running.

Usually there is a sensor in the block that measures the heat of the water, then another (usually part of the MAF) to monitor intake air temperature.

You really need to get someone with ISTA to see what's going on, I echo the previous remarks about diagnostics being essential and how cheap it is to buy a cable

If you're anywhere near Potters Bar I'd see what codes etc comes up. Of course there is still interpretation of the results but at least it's a start. If all electronic checks are OK then it could still be mechanical

One easy check is to remove the auxilliary belt to eliminate the water pump and alternator and aircon compressor, run the engine briefly and see if the noise goes away.

Not sure on the N47 engine but that is very easy on a lot of BMW engines
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      10-22-2019, 09:08 AM   #75
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Cool! Thanks all. I will wait for the garage to call back and get them to check the temp sensor wiring then! Then see if that does make difference. Just strange it has always read this way. Off day it has had a moment and read properly, so there I think it will be a nick in the wire somewhere which is why I was going to try sort it.

They are a germa auto specialist so I am hoping they have read the car themselves...
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      10-23-2019, 07:36 AM   #76
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UPDATE: delved deeper, chains being replaced, parts and labour (genuine parts) £1304

Given them the go ahead!
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      10-23-2019, 08:22 AM   #77
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Quote:
Originally Posted by betty02 View Post
UPDATE: delved deeper, chains being replaced, parts and labour (genuine parts) £1304

Given them the go ahead!
That's good the problem has been found, but an expensive lesson in the risk of idling a cold engine!
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      10-25-2019, 03:30 AM   #78
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Quote:
Originally Posted by bishbosh View Post
That's good the problem has been found, but an expensive lesson in the risk of idling a cold engine!
Oh yes indeed! Lesson fully learned here! Still sticking in me that it was going to be for sale around feb! Looks like I shall be keep her a little longer now! Fingers crossed this sorts it anyway and that the bill stays around the estimated costs!
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