D3 TDV6 poor fuel economy

[Timmy]

Surprisingly I couldn't find many posts about D3 TDV6 poor fuel economy! I guess this is a good thing. Just the recent thread, but that just came from a service...

I bought a D3 TDV6 about a month ago - beautiful car to drive! My only concern is the economy.

The car gets driven around town mostly by my wife. She's no leadfoot and the car is never heavily loaded. I've been tracking economy by filling up right to the filler neck so I know I'm getting the right readings.

Trip computer calculates around 14.6-15L/100km, however I just calculated 16.8L. This seems a lot, even for around town! Lots of people are suggesting 10L/100km open road, and 11-13L/100km around town.

I thought it may have been the full roof rack, but taking that off has actually made no noticeable difference. The car has a pair of rocksliders that would add a bit of weight. I thought that maybe the 285/35R22 tyres/wheels - Maybe adding rotating mass and more contact with the road from the width?

The car apparently has a remap of some sort, but I'm not sure what brand - perhaps it's some average tune that's thumping diesel through?

What are the usual culprits for increasing economy on these?

[BobD]

How is your air filter?

[LandyAndy]

Check your tyre pressures.
Andrew

[Meken]

Maf sensor need cleaning? Egr valve ?
& try a brick behind the accelerator pedal ;)

[Timmy]

How is your air filter?
Just checked, bit of dust, but not crazy like some I've seen! Looks quite new. First time I've had to unscrew an airbox as opposed to unclipping.




Check your tyre pressures.
Andrew
Aired up the other day, sitting at 45psi a corner (quite low profile, so need a bit).



Maf sensor need cleaning? Egr valve ?
& try a brick behind the accelerator pedal ;)
These things are probably next to try. Now to find them on this thing! Seems to get quite hot under there.
Brick idea is just mean lol

[LandyAndy]

Get the brick from a Toyota owner,they use it on the other side of the pedal;););););)
Andrew

[shanegtr]

Get the brick from a Toyota owner,they use it on the other side of the pedal;););););)
Andrew
I thought it was to replace the non functional handbrake :D

[jonesfam]

D3 TDV6's are pretty heavy on fuel around cities.
Because I live in the bush I was shocked & stunned last time I was in Townsville, went from about 10.5LPH to over 15LPH in a week.
Jonesfam

[Narangga]

D3 TDV6's are pretty heavy on fuel around cities.
Because I live in the bush I was shocked & stunned last time I was in Townsville, went from about 10.5LPH to over 15LPH in a week.
Jonesfam

Seems the read out in the message centre is regularly about 1 litre lower than actual.

Jonesfam figures are pretty much what we are getting. Last refill the wife didn't remember how many kms on the trip meter so not sure what it was exactly.

Locally (less than 10km per run) is quite high but a run into town (over 30km along the highway) drops down to 10 - 11.

[PeterOZ]

I get around 10.5 to 11 around town and down around 7 on the highway


tyre pressures, type of tyres


MAF and MAP sensor clean


put new air filter in either if it looks good.


modify driving habits, sit in torque curve.


My ex wife swore she did not flog the car but after driving with her a few times I soon saw where the fuel economy was going. I'll leave that discussion to you to have!! :wasntme:

[PerthDisco]

Check also for the split turbo top hose.

Mine does around 11 in city driving.

[Timmy]

Will check top hose and check the maf/map. Definitely confirmed that it's actual, not just off the readout as I filled to same spot and calculated that way.

Thanks for the ideas!

[Narangga]

I cleaned my MAF sesnor today (BEFORE picture attached :eek2:) and already that has cut black smoke by about 75% and I have noticed an increase in responsiveness during acceleration.

However the one second delay off idle still exists.

Hopefully fuel economy improves now too.

[Ean Austral]

My wife drives ours and consistantly 10-11 city diving with road tyres and no roof rack.

Put on MT tyres and roof rack and its 13 add camper and its 13.5 to 14.

I clean the Senser in the Y piece on top of the engine every fortnight, and remove the Y piece and clean it every service.

Check the 2 main hoses that go to the I/Cooler 1 on either side of the radiator at the bottom. I believe the drivers side one does split .

Cheers Ean

[Narangga]

It has new silicone intercooler hoses and new other hoses from the timing belt change a few months ago.

Once I get some more time I'll put the blanking bits in too.

10 degrees here at home this morning too. ;)

[sheerluck]

Just to ensure picky Dale, that's the MAP sensor, not MAF sensor.

The MAF sensor sits just to the right of the air box as you look at it.

[Narangga]

Just to ensure picky Dale, that's the MAP sensor, not MAF sensor.

The MAF sensor sits just to the right of the air box as you look at it.

Thanks Dave - more than happy to be correctly informed. However the improvements already experienced mean that it was certainly worth doing anyway.

I had looked through the workshop manual and it did not bring up an MAF sensor for the TDV6 :(

Will have a crack at the MAF sensor tomorrow evening. About to head to the Mindil Beach markets :p

[~Rich~]

I'm just back from a 5773k trip in 13 days - so we averaged 444k a day!

Anyway I cleaned both the MAF & MAP sensors and changed all my oils before the trip, my EGR valves are blanked and I averaged 13.17lts/100k with a roof rack( with wood!) and my oversize mud tyres.

This figure has been calculated back down to standard tyre kms and the lowest I had was 12.2 and the highest 13.9 so I'm reasonably happy with those figures.

BTW the first tank was the lowest figure and it also had 2 stroke added which none of the other fills had, maybe something in that.

[A.J.M]

When was it last serviced?

May be an idea to give it a full service with all new filters and oils, I always find the fuel filter gets missed a lot. LR say every 75,000 miles but I change mine earlier than that.

Also, for egr valves.
If your car is an 04-07 it can be blanked easily. Plenty of kits and guides to show how to do it.
If it's a 07-09 then you need to fit emulators as well as the physical blanks as the egrs are tied into the engine management system and simply removing the egrs throws up an engine warning light.
The emulators fool the car into thinking the egrs are still present and doesn't throw up a warning light.

If it's an auto, it may need the gearbox oil and filter changed.
ZF say every 50-75,000 miles between changes for them.

Very few people do that of course.

[Meccles]

If it's got a chip added, have you identified which and where? If car is modded you need to know how and by whom

[PerthDisco]

When was it last serviced?



May be an idea to give it a full service with all new filters and oils, I always find the fuel filter gets missed a lot. LR say every 75,000 miles but I change mine earlier than that.



Also, for egr valves.

If your car is an 04-07 it can be blanked easily. Plenty of kits and guides to show how to do it.

If it's a 07-09 then you need to fit emulators as well as the physical blanks as the egrs are tied into the engine management system and simply removing the egrs throws up an engine warning light.

The emulators fool the car into thinking the egrs are still present and doesn't throw up a warning light.



If it's an auto, it may need the gearbox oil and filter changed.

ZF say every 50-75,000 miles between changes for them.



Very few people do that of course.



Is there an emulator product without buying new EGRs? Thanks

[PerthDisco]

I found the post. All good

[Narangga]

When was it last serviced?

May be an idea to give it a full service with all new filters and oils, I always find the fuel filter gets missed a lot. LR say every 75,000 miles but I change mine earlier than that.

Also, for egr valves.
If your car is an 04-07 it can be blanked easily. Plenty of kits and guides to show how to do it.
If it's a 07-09 then you need to fit emulators as well as the physical blanks as the egrs are tied into the engine management system and simply removing the egrs throws up an engine warning light.
The emulators fool the car into thinking the egrs are still present and doesn't throw up a warning light.

If it's an auto, it may need the gearbox oil and filter changed.
ZF say every 50-75,000 miles between changes for them.

Very few people do that of course.

The last service was 1,200 km ago. I will need to check at the workshop but it would seem the fuel filter was not done.

I have the blanks and have been trying to find the time to fit them.

Transmission service was done at 60,000 km (9,000 ago).

[Narangga]

Just to ensure picky Dale, that's the MAP sensor, not MAF sensor.

The MAF sensor sits just to the right of the air box as you look at it.

You mean the one referred to as 'MAP' in point 4 of the attached?

[jonesy63]

Yes, point 4 is wrong! That's the Mass Air Flow sensor, which has a delicate wire which must only be cleaned with MAF sensor cleaner.

[sheerluck]

You mean the one referred to as 'MAP' in point 4 of the attached?

:lol2:
If that's the official LR workshop manual, then that's a bit of a screw up.

Google part number LR019130 (or 1316126 the old number) for the MAP sensor, and you'll see the image and location.

Equally part number PHF500101 for the MAF.

And if you think about it, the best job and best place for a Manifold Absolute Pressure sensor, would be measuring Pressure (of the pressurised air being fed from the turbo) in the inlet Manifold? :angel:

Good old Land Rover, inconsistent at the best of times. :D

[Narangga]

Yes, point 4 is wrong! That's the Mass Air Flow sensor, which has a delicate wire which must only be cleaned with MAF sensor cleaner.

Yes was aware of that - just that LR didn't want me to find the sensor...



:lol2:
If that's the official LR workshop manual, then that's a bit of a screw up.

Google part number LR019130 (or 1316126 the old number) for the MAP sensor, and you'll see the image and location.

Equally part number PHF500101 for the MAF.

And if you think about it, the best job and best place for a Manifold Absolute Pressure sensor, would be measuring Pressure (of the pressurised air being fed from the turbo) in the inlet Manifold? :angel:

Good old Land Rover, inconsistent at the best of times. :D

:D

I did say that I did a search for 'MAF' in the workshop manual and it only gave me the petrol engined versions...

Of course the manual was bought from the forum store ;)