poor fuel economy td4 auto

Hi,

My TD4 auto (2004) is returning about 18 mpg on town driving.

I know it is extremely cold etc but the hand book quotes 25mpg.

Is there something wrong?

I may have a thermostat problem causing the engine to run at a lower temp than normal. Maybe this is effecting fuel?

Any comments please.

Thanks


Rob

that does seem quite low, mines giving 27mpg at the moment.

might be worth checking if your brakes are seizing / stiff or if your vcu is stiff / siezed

Mine's about 30mpg. Have you also checked for leaks, perished fuel line?

traffic0703 said:

Any comments please.

Thanks


Rob

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This is the 3rd thread you've started in 3 posts, why don't you list all symptoms in one thread and maybe have the decency to acknowledge peoples replies?

mine is doing 23mpg at mo to my dismay, but hey you bought a landy not a toyota Aygo

Mines returning a pretty naff mpg - guess it's the cold whether and me trying to do 4x4 wheelspins - with some success!!!

I hope the front wheels slip first

Your poor fuel economy, lack of power and cold engine temperature could be symptoms of the same fault.
Possibly thermostat opening to soon.

Skynet said:

I hope the front wheels slip first

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I think they do, but as I'm in the Hippo - a bit hard to see - have tried adjusting the mirrors, but to no avail....

It does feel that front first then the rear kicks in........'he hopes...'

My MPG is down a bit in this weather. I put it down to running the heaters etc on full whack, and the fact that the engine seems to take longer to warm up so using more revs on the autobox.

Run some millers through on a double dose for a tank or so and see if it picks up, I like many on the forum swear by the stuff (****, another £12 ), but in all honesty it does clean up your injectors and the fuel system altogether seems a little more efficient.

Also check your tyre pressures as you may have lost a few PSI in the cold as the air becomes less dense.

Like others said, check for resistance anywhere in the drivetrain & breaking system, this should present itself as having to give the TD4 the beans just to get around normal driving, does it feel like its pulling a weight or resisting?

Mine has steadly dropped with the temp ove rthe last 3 months from avg 37 to 32

did my tyres yesterday and they were down all round (not just at the bottom) by about 5 psi

I think the cold weather in general ruins the MPG. Big block to heat up, and lots of ancillaries running. You will probably find it picks up again when the weather gets a bit warmer. I find that whenever I need to use glow plugs (when the dash light comes on) the MPG is due a hit. Then when it warms up back to normal. Also tyres are all over the place at this time of year. If I'm in Cornwall I bring them up to 30psi, if I'm in Scotland I leave them down a few psi to maintain grip in the snow.

37 to 32 elvis !!! mine is 23 now and was 27 in summer

auto+loads of choke time+stop/start=****e mpg.

Many thanks for the suggestions - going to get the thermostat looked at first to see if this improves things as something is definately wrong there. I think this plus the weather is probably the main reasons.

ashleywood.ash said:

37 to 32 elvis !!! mine is 23 now and was 27 in summer

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i do drive like a vicar though...