Quote:
Originally Posted by Upex
The stuck variable vanes sounds (from Zulu link) plausible to, but unsure how to check them and why the engine would be noisier if this would be the case.
Would a bad maf get bit better if unplugged, as mine doesn't lol.
Cheers all,
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I think swapping out the turbo unit has eliminated the vanes as a possible issue but the control to the vacuum control to the vanes could still be an issue. As you say, it seems unlikely that a VVT issue would make the engine noisier.
Not sure about the MAF on our M57N engines - does traditional petrol engine wisdom transfer to these diesels? Heck, there isn't even a throttle body!
I guess if the MAF was returning totally mad values to the DDE, then unplugging it and forcing the DDE to fall back to lookup tables might make it better but it seems you have eliminated this anyway.