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Author Topic: Poorly e39 530d  (Read 5182 times)

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JamesV6CDX

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Poorly e39 530d
« on: 27 March 2016, 15:52:11 »
My 530d e39 3 litre turbo diesel

Last week, massive power loss, big hiss of air under acceleration, loads of black smoke from exhaust

Found a 2 inch split in a turbo pipe between turbo and intercooler. Result thinks I.

All boost pipes very soft so I replaced them all with brand new ones

Week later. Noticed a (lesser) hiss under accelerating today.

The same pipe has split again!!!

It must be under a massive amount of excess pressure to be doing this to a new pipe!

Any ideas? Why would it over boost that much? I want to fix it but time isn't on my side, I need a reliable car for my commute.

I have access to the software to read codes and live data
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TheBoy

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Re: Poorly e39 530d
« Reply #1 on: 27 March 2016, 16:16:29 »
Boost pressure?
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JamesV6CDX

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Re: Poorly e39 530d
« Reply #2 on: 27 March 2016, 16:24:17 »
Quote from: TheBoy on 27 March 2016, 16:16:29
Boost pressure?

Definitely seems it's the boost pressure too high, but I know very little about what this could be or how to diagnose it

There are similar issues on forums but no actual resolutions
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GastronomicKleptomaniac

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Re: Poorly e39 530d
« Reply #3 on: 27 March 2016, 16:37:58 »
Does it have a dump valve, either to air or recirculating?
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X30XE

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Re: Poorly e39 530d
« Reply #4 on: 27 March 2016, 17:08:38 »
Mechanical or electrically controlled turbo on these?
Has someone "fiddled" with the wastegate linkage?
Is the linkage seized in the open position?
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JamesV6CDX

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Re: Poorly e39 530d
« Reply #5 on: 27 March 2016, 17:18:30 »
Vacuum controlled I believe
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TheBoy

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Re: Poorly e39 530d
« Reply #6 on: 27 March 2016, 18:34:09 »
Quote from: JamesV6CDX on 27 March 2016, 16:24:17
Quote from: TheBoy on 27 March 2016, 16:16:29
Boost pressure?

Definitely seems it's the boost pressure too high, but I know very little about what this could be or how to diagnose it

There are similar issues on forums but no actual resolutions
What is it reading?
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JamesV6CDX

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Re: Poorly e39 530d
« Reply #7 on: 27 March 2016, 19:20:43 »
Will need to check :y
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serek

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Re: Poorly e39 530d
« Reply #8 on: 27 March 2016, 23:11:21 »
sound like blocked cat to me
air pipe did you replaced with new or used?
« Last Edit: 27 March 2016, 23:14:38 by serek »
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JamesV6CDX

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Re: Poorly e39 530d
« Reply #9 on: 28 March 2016, 03:25:56 »
Quote from: serek on 27 March 2016, 23:11:21
sound like blocked cat to me
air pipe did you replaced with new or used?

Thanks  Serek :y

Any easy way to test the cat?
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JamesV6CDX

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Re: Poorly e39 530d
« Reply #10 on: 28 March 2016, 03:26:16 »
New pipes :y
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106pete

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Re: Poorly e39 530d
« Reply #11 on: 28 March 2016, 08:41:57 »
Does it have swearl flaps, any chance they can be stuck closed? I know they are a problem on bmws
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Broomies Mate

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Re: Poorly e39 530d
« Reply #12 on: 28 March 2016, 18:29:45 »
Internals of the Intercooler collapsed and causing a blockage?  Quite common on the Saabs, pressure builds and builds until it lets go with a woosh!
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Andy H

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Re: Poorly e39 530d
« Reply #13 on: 28 March 2016, 18:58:12 »
Does the turbo have variable vanes to control the boost pressure?

My only diesel experience so far is of our 1.9tdi galaxy. When the vanes in the turbo started to seize we had intermittent limp mode due to excess boost.

Getting the turbo off and freeing the vanes was tedious but not too difficult and seems to have solved the problem for now. Galaxy has done 140,000 miles.
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Kevin Wood

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Re: Poorly e39 530d
« Reply #14 on: 28 March 2016, 19:02:38 »
I'd have thought the ECU would have shut it down before the boost got high enough to fracture ducting, unless someone has been playing with the mapping. ::)

Could well be a blockage between turbo and MAP sensor though. Need some live data from it, really
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