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?
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 ?.
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19th May 2019 4:54 pm
Member Since: 22 Sep 2010
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.
19th May 2019 5:13 pm
Member Since: 23 Oct 2012
With exhaust fumes from behind the engine it is likely the crossover pipe has a hole in it
19th May 2019 6:05 pm
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Member Since: 28 Dec 2018
Location: Cradley Heath
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..
Those in the know, know. Those that don't know, just need to ask.
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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.
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