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[Shackeng]

My TD has just started using significantly more fuel according to the computer. Most of my driving is less than 20 miles, and it usually shows about 29 mpg. It has suddenly this week dropped to about 24 with no change in journey lengths or driving style.No sign of leaks anywhere. I'm about to juggle the cars to get it in the garage to have a look at pipes, filter, etc. Any suggestions to assist diagnosis?

[TheBoy]

If you can get a code reader on it, coolant temp sensor (engine one, not dash one) worth a look.  Fuel consumption will increase slightly this time of year (colder, more electrical load, diesel has more antiwaxing agents in), but that seems excessive.

If chipped, worth doing a calculation the old fashioned way. To be honest, even 29mpg seems very low .  Yours is a manual tractor IIRC?

[Shackeng]

No auto. Can I paper clip this?

[Seth]

No auto. Can I paper clip this?

Possibly Chris - try this: http://www.omegaowners.com/forum/index.php?topic=90581.0

[Shackeng]

Thanks Jaime, Byron, seems to paper clip OK, I get only the 12's, so no codes. I am guessing that I should get code 14 or 15 if I had a coolant temp sensor fault.

[Seth]

Thanks Jaime, Byron, seems to paper clip OK, I get only the 12's, so no codes. I am guessing that I should get code 14 or 15 if I had a coolant temp sensor fault.

Personally Chris, I'd brim the tank, use the car for a few days, then re-brim it and take things from there.

I've not known auto-boxed TDs to return favourable fuel consumption figures - but they're my own experiences!

[Elite Pete]

Mines showing 57mpg approx but it is chipped so its miles out

[Shackeng]

Thanks Jaime, Byron, seems to paper clip OK, I get only the 12's, so no codes. I am guessing that I should get code 14 or 15 if I had a coolant temp sensor fault.

Personally Chris, I'd brim the tank, use the car for a few days, then re-brim it and take things from there.

I've not known auto-boxed TDs to return favourable fuel consumption figures - but they're my own experiences!

I'm fairly confident that the computer has not suddenly decided to give a dodgy mpg, I've fitted a new air filter, although the old one was only a few thousand old and not very grubby, and cleaned the plastic bit at the front, plus the egr and inlet pipes. I'll see if that improves things before I start worrying seriously.

[Shackeng]

If you can get a code reader on it, coolant temp sensor (engine one, not dash one) worth a look.  Fuel consumption will increase slightly this time of year (colder, more electrical load, diesel has more antiwaxing agents in), but that seems excessive.

If chipped, worth doing a calculation the old fashioned way. To be honest, even 29mpg seems very low .  Yours is a manual tractor IIRC?

Currently uncipped awaiting AR35 fitment. MG TF overhaul and kitchen installation taking priority at present.

[Dodger]

My auto tractor returns about 25-27 around town, and 35-37 on a run, and has done since in the 4 years I've owned it. These figures seem about right according to the owners handbook, and considering mines covered 183K!!

[Seth]

My auto tractor returns about 25-27 around town, and 35-37 on a run, and has done since in the 4 years I've owned it. These figures seem about right according to the owners handbook, and considering mines covered 183K!!

That's about the norm for an auto-boxed TD IME

[zirk]

ive had a couple of 2.5 TD's the later being a manual would never fall below 35 mpg in London's rush hour and 45 plus on a run, the auto one I had, long gone, would still do 30 mpg in London's traffis withup to 40 on a run. Remeber having issues with the auto including power loss at high speed and high mpg, did the usual checks including diesel magic, turned out to be the Maf, worth a check.

Chris.

[Shackeng]

ive had a couple of 2.5 TD's the later being a manual would never fall below 35 mpg in London's rush hour and 45 plus on a run, the auto one I had, long gone, would still do 30 mpg in London's traffis withup to 40 on a run. Remeber having issues with the auto including power loss at high speed and high mpg, did the usual checks including diesel magic, turned out to be the Maf, worth a check.

Chris.

Will do thanks.

[Shackeng]

MAF? Just read a post on this, and its seems to do....well not much, unless at high revs, whereas I drive Miss Daisy so I don't think its going to be that.

[aaronjb]

Thanks Jaime, Byron, seems to paper clip OK, I get only the 12's, so no codes. I am guessing that I should get code 14 or 15 if I had a coolant temp sensor fault.

Just to cover this as it got skipped over - you'd only get a code 14/15 (or whatever the code is for the coolant temp sensor) if it was open circuit or wildly out of calibration returning 'impossible' readings to the ECU..

If it started reporting just 'consistently cold' then the ECU can only assume that the engine is, in fact, cold and fuel accordingly.. unfortunately the only way to tell that is with live data..