Engine: TD: Very high fuel consumption.

[SIAMBLUE]

Just wondering if any of you guys have come across any causes for high fuel consumption ?
When I bought the car coming back it was returning 41mpg at 60mph but I knew it wasn't running right, now I have changed the maf and map sensors and changed the N75 and the surge flap , the car is returning 25mpg around town,
I have bought some Moby liquid purge for cleaning out the fuel system and also a new filter is on order, I don't know much about diesels but I am guessing it is something to do with the injectors as it is high mileage. But I can't afford to keep it with that sort of mpg.


Regards Gary

[alfadave11]

have you had ecu codes read ?

[SIAMBLUE]

Yes no codes related to the fuelling or the engine, well only one glow plug deleted it and it never came back up,no EML

[alfadave11]

is there much soot out of exhaust on hard acceleration ..does car feel powerful and smooth delivery
ps and history prior to you buying it ie cam belt service?

[SIAMBLUE]

Yes quite a bit of soot,that's why I think it is injectors, Gatos told me not to bother with injector cleanser as halfords do it for £4 a bottle additive too the tank, but I have bought the Moby liquid now which goes directly into the injectors and not via the tank.

[gatos]

Originally Posted by SIAMBLUE

Yes quite a bit of soot,that's why I think it is injectors, Gatos told me not to bother with injector cleanser as halfords do it for £4 a bottle additive too the tank, but I have bought the Moby liquid now which goes directly into the injectors and not via the tank.

Liqui moly, not moby liquid.....

[neanderthal]

would i be off the mark here with the egr valve needing a clean

[skyship007]

Originally Posted by neanderthal

would i be off the mark here with the egr valve needing a clean

The 25 mpg is way off the mark even for in town use, so if the engine is not smoking from a bad injection system it might well be a fouled EGR or CAT.

It might also be something silly, like stuck rear calipers!

Always read the instructions before using LM Diesel Purge:
http://www.liqui-moly.com/liquimoly/...cument&land=gb

See the link to the product data sheet near the bottom of that page.

[alfadave11]

a can or a bottle of whatever is not gonna fix a problem..from my experience it moves cwap and can often worsen or cause another problem
I would clean egr out and replace fuel filter(often left out in servicing)
also check inlet manifold is not restricted

[alfadave11]

I would check boost hoses off car and check turbo inlet pipe to maf for small splits