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Matt
Matt, Mechanical Engineer
Category: Mercedes
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Experience:  BEng hons Mech engineering, in auto industry 22 years
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My 07 sprinter is blowing smoke from exhaust, (which smells

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My 07 sprinter is blowing white smoke from exhaust, (which smells like diesel). It does this predominantly when driving in London. ir permanent stop start driving. It does it sometimes on motorway after a decent run of say hour or more, but can be stopped by allowing enigne to cool down for 30 min, then carrying on with journey. I had a new turbo fitted in January and the smoking started after that was fitted.
Submitted: 1 year ago.
Category: Mercedes
Expert:  Shantal-Mod replied 1 year ago.
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Expert:  Matt replied 1 year ago.

Hello

I'd agree that if you're getting white smoke then its very likely unburnt fuel

So check the small vacuum lines to the turbo and its connected control solenoid on the bulkhead, any cracks or leaks can give turbo issues and its best to have the boost pressure measured actually measured with a boost gauge to check that the turbo is healthy and that the sensor is reading correctly

If its a variable vane turbo (they’ll be an actuator on the turbo body - but not a wastegate) then check its vacuum pipework as above and check the connections to the diaphragm / solenoid valve

Also worth considering adding a bottle of injector cleaner into the tank as a clogged injector nozzle can stick open and so dribbling fuel all the time which will reduce power and give poor combustion - the next stage on from this is to remove all the injectors and have them ultrasonically cleaned and flow checked

Also check all the high pressure hoses post turbo/s for any split hoses or cracked metal pipes, also check the ends of the intercooler as its not unheard of to pop the end caps off under high boost.

Expert:  Matt replied 1 year ago.

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Matt, Mechanical Engineer
Category: Mercedes
Satisfied Customers: 22241
Experience: BEng hons Mech engineering, in auto industry 22 years
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