Fuel Economy 2002 ML 270CDI

[gtvlusso]

Hi All,

Having a few issue with the ol' ML.

I appear to be getting about 20mpg at the moment......down from near 30mpg:

Stuff:

Engine remapped to 210BHP
MAF changed recently
EGR cleaned recently
Major service recently

I am a very light footed driver and the remap initially made no difference at all. I am at a loss to explain the economy drop.

Should I get the intake manifold off and clean it?

Any ideas?

 

[Bobby Dazzler]

What engine temperature does it get up to?

 

[Gazz270]

i had similar problems with mine,once i cleaned out the manifold and removed the little swirl valves it made quite a difference to the economy also seems to drive a lot smoother as well.

hth

gareth

 

[Bobby Dazzler]

I had similar done to my car yesterday, and the 174 mile back suggested the engine is better for it. Whilst I've not measured how much fuel I used in each direction, I did brim it when setting off in both directions, and there's certainly more in the tank after the return trip than there was after the outbound trip.

 

[gtvlusso]

Temp stays at about 70 to 80 degrees. Are the swirl flaps necessary? Thinking about cleaning and disabling them if they are useless.

 

[Bobby Dazzler]

70-80 degrees is a touch low - ours was the same until yesterday. Should be just over 80-degrees. Thermostat most likely cause. If running cool it won't be quite so efficient.

An explaination of swirl flaps albeit BMW focused can be found here: What are BMW swirl flaps

I doubt they're absolutely necessary, but if damaged you wouldn't want any fragments going into the engine.