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Dartanjang
Member Since: 20 Dec 2014
Location: Mountain Strokes
Posts: 77
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Well dear community, what do you think?
I get red warning with reduced performance and have the following fault codes (read w Nanocom):
P1247 Turbo boost pressure low
P22D3 Turbocharger inlet valve stuck closed
P22CF Turbocharger turbine inlet valve control circuit - open
I have dismounted the CSOV vacuum chamber and the butterfly valve is really loose and easy to turn back and forth. The CSOV rod is possible to push into the vacuum chamber against the spring by hand. Ok, I´ll admit that it takes some force but it isn´t stuck solid in any way. But judging from the force needed to push against the spring, the vacuum to open the butterfly needs to be rather high. Is this normal?
So, putting all the symptoms together from the above, the CSOV actuator could be a probable culprit. The membrane might be punctured and the switch to a new one is simple so the first thing I will do is to replace it.
However, here comes my biggest worry about this:
Having the bonnet open and stalling the engine against the brakes to see and hear what is happening with the turbo actuation, there are significant blows of exhaust that emerges from behind the engine. How worried shall I be? Could this be a natural result of a shut CSOV and everything is fine or shall never exhaust fumes appear regardless of CSOV malfunction?
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 19th May 2019 3:14 pm |
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Hardware
Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 13030
  
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i'm sure someone with more hands-on experience of turbo issues will be along soon but I can't help but think the escape of exhaust can't be the turbo itself ... unless it's holed in some way ? what state are the pipes in ? .
Dean
====================================
2011 D4 XS - OBD port protection, RLD spare wheel protector, All LED interiors lights, Timed Climate enabled, iiD tool paired.
2011 D4 Landmark - Stolen from same dealer before I paid for it
2011 D4 GS - Stolen whilst at dealer  ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms
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| 19th May 2019 4:54 pm |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8235
 
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Can’t stall mine like that, it’s probably the TC overheating and burning the AT oil! It can when others can't,
It will when others won't,
It goes where others don't.
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| 19th May 2019 5:13 pm |
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Fifth Horseman
Member Since: 23 Oct 2012
Location: Lanarkshire
Posts: 217
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With exhaust fumes from behind the engine it is likely the crossover pipe has a hole in it
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| 19th May 2019 6:05 pm |
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OvalAutos
Member Since: 28 Dec 2018
Location: Cradley Heath
Posts: 382
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Suspect crossover pipe or failed exhaust gasket.
The primary turbo (N/S) relies on the exhaust gasses being bypassed from the secondary turbo (O/S) to spin up to speed. The VNT vanes are adjusted by the electronic actuator, which assumes the bypassed gasses are helping the primary turbo. If the gasses are not coming through from the seconday turbo, the primary does not give the correct amount of boost and the MAP sensor thinks the turbo has a problem.
It doesn't take much of a gas loss to give these errors. Joe
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| 20th May 2019 6:34 am |
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Philip1972
Member Since: 10 Mar 2017
Location: Gloucestershire
Posts: 1073
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Mine had a tiny hole in the crossover pipe and was showing restricted performance.
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| 20th May 2019 6:51 am |
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Dartanjang
Member Since: 20 Dec 2014
Location: Mountain Strokes
Posts: 77
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I have now studied the turbo system a bit and I agree that what you say sounds logical and a very probable cause for my problem. I will try to inspect the crossover as best as I can and then decide what to do about it.
Thanks for all input so far everyone.
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| 20th May 2019 8:39 am |
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