Smelly C220 CDI

[davidgirecourt]

Hi

I've just bought a 1999 C220 CDI but when I switch off the engine there is a strong smell of burnt or unburnt diesel coming from under the bonnet as well as smoke (once), could this be generated from the auxiliary heating system?

Thanks

David :?

 

[maybach]

we do see from time to time fuel loss from the high pressure injector pipes
( rail to injector)
Just a tweak with a spanner is all thats needed
These pipes are under the large black panel.
let us know how u get on
maybach

 

[piestore]

CDI

Hi

sounds like a fuel leak. common places are pressure sensor and priming point if it has one ( fuel pipe with white plastic bung in it) . The aux heating system on the c class is electric and not the night heater type.

If the car is still under warrenty get it into a dealer. If it isn't, and you want to have ago yourself remove the engine covers (six screws) and check for any leaks. If diesel is present but no source is found start the engine this gives the high pressure side about 250 bar of pressure, if there is still no sign of the leak get some one to rev the engine while you look for the leak but dont' get too close this will produce about 1380 Bar (20,000 psi).


This is a very specialised system with extremly high pressure DIY is not recomended

 

[davidgirecourt]

Thanks all

I will let you know.

Cheers

 

[leith]

This is, reportedly, a not uncommon problem. Since diesel soaks the underside it should surely be a re-call but M-B do not do that (??) and the problem for slower drivers is unlikely to occur.....until they go fast...and then there may be a few rubber bits for M-B to replace under "warranty" too, not to speak of the environment!!

The leak will probably not occur at low medium speed and load but will
flood out at high speed/load and may damage/turn to jelly, exhaust rubber mounts and anything else rubber. Just revving the motor may not produce the leak, but a stretch at 100 odd MPH could leave the underside all wet. Slower motoring thereafter and you may not even know the leak took place especially as the waxed underside of your vehicle will just look
a little "waxier" than before.

M-B allow for the problem as they have a rubber vent pipe away from the leaking area on some models ... to vent the leaks onto whatever they feel needs neat diesel, I guess!

There's a bit more to it than removing 6 screws...you'll probably need to remove the inlet manifold and assorted stuff. OK if you're up to such work but best done by some-one mechanically "bright".

Best too to check the pump outlet (pressure) connection for tightness too.