Hello. Hope you can shed some light on my ongoing problem.
I have purchased a Mercedes sprinter 318 2007 plate approx 3 month ago.
So far I have had an injector renewed, new heater plugs with control unit, had dpf regenerated, had diesel cleaner through tank. New fuel filter and air filters.
My problems are
- bad starting in morning in cold weather and warm weather (engine will turn over for 5 seconds before firing).
- under normal driving conditions the van is powerfull and responsive all of a sudden the engine note will go lower and the engine will be so much quicker and too responsive if that makes sense! When this happens there is medium amounts of blue / dark smoke coming out of exhaust.
-my average mileage per tank is only 320 miles where as the estimated mileage starts off at 460 on the trip display. don't know if this has anything to do with problems above?

I travel about 10 - 15 miles per day. With a longer journey once a week to help get dpf to temp. I use shell optimax diesel which is supposedly cleanest diesel in my local area.
Hope my information is ok and any help or advice would be highly appreciated.
Many thanks.