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· Registered
7 Posts
Discussion Starter · #1 ·
Over the last little while my 2003 E320 has started to give me really poor fuel economy. Sometimes I get a smell of diesel in the car. I've had s good look under the bonet and have not been able to find any fuel leaks. Also there is never and marks on the floor after I park.

£25 will give me aound 110 miles when not booting it around!:mad:

Just wondering of anyone else hs experiened this. or what I should look out for.


· Super Moderator
02 ML500, 00 ML320, 05 E500 4M Wagon, 99 ML430
23,702 Posts
Could be a bad injector or sensor that sets the the richness of the each squirt from the
injectors. The pressures in a diesel injector system are off the charts compared to
petrol engines. So if something is out of whack in the fuel delivery system it can kill
the mileage.
Other things that kill them is a turbo issue or thermostat, but the thermostat should be
very obvious if it is not closing and keeping the engine hot enough to run at its best

· Registered
2006 E320 CDI, 2009 ML320 Bluetec, 2009 GL320 Bluetec
1,481 Posts
Injectors self adjust over time and recalibrate everytime you coast. Max deviation is 5mg/Stroke, more than that and you will get an engine code for excessive injector deviation.

Pull the codes, thats the easiest place to start.

A sensor such as coolant, MAF, Boost etc with incorrect data can really toss your fuel economy out the window.

Get a qualified diagnostic, start from there.
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