2007 Sprinter injector leak-off rates.


New Member
Feb 16, 2010
Sprinter 311 LWB Luton
I'm pretty certain I've got one or more dribbling injectors on my 2007 311 CDI, they're the Bosch Piezo type..

Symptoms are - rough idle when hot (as though it were running on 3.5 cylinders or imagine putting the choke on a hot petrol engine), very smoky at idle, clears when under way after 30 seconds or so and, oil level going up.

Before I pull the trigger on £750 for a set of 4 recons, I'd like to try and pin things down to specific cylinder(s) via a leak-off test, I can borrow the kit off a mechanic.

Can anyone provide a specific range in ml/min so I can gauge which cylinders are dodgy and possibly confirm my logic in that a dribbling injector will produce a lower leak-off rate than expected whereas a knackered injector will leak-off at a higher rate or doesn't it work like that?

I appreciate that normally, if one cylinder differs from the other 3 significantly then it's likely to be the dodgy one but without a specific target range, how would I know I don't have 3 bad and 1 good?


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