Quote:
Originally Posted by clarkey1984
Im unsure if diesels work the same, but when my t4 was being diagnosed a boost hose was removed to check something, and this gave a rough idle and lots of black smoke, as the fuel air ratio the engine is trying to maintain with the boost hose not connected is thrown way out of whack, it still sticks in the right amount of fuel but isn't receiving the amount air its expecting, so its conceivable that a boost leak would produce similar symptoms but on a lesser scale maybe?
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Yep. Worse for diesel as they work with full air all the time, only the fuel is adjusted. So, as you say, lack of air would produce smoke and power loss. Overfuelling on a diesel is more likely to just make it go like stink.