Thread: D2 TD5 fuel economy - bad?

Owen,

Firstly, Rovacom won't usually show an airflow meter fault to the degree that they can be quite poor before the fault appears. You should be getting around 58 to 61 Kg/hr air flow at idle, and full throttle under load at least 550 to 650.

If you see 48 to 50 at idle, and less than 450 under load, then IMHO the Airflow meter is near to not actually doing it's thing. This will cause fuel consumption issues.

The figures you are getting aren't THAT horrific but I agree they aren't ideal if you are driving sensibly. I, too would expect 10l/100 from a Td5.

Try a known working Airflow meter and see what happens


JC

Well my '96 Defender does between 26 and 30 mpg

The "newer" D2 Auto TD5 only does 24 mpg

Too late at night to convert into that new fangled litres per 100kms measurement

Town driving with A/c on -- (all the time, this is Brisbane) -- >750K / tank,
H'way, A/c on --(used to it) > 900K / tank.

Originally Posted by justinc

Owen,

Firstly, Rovacom won't usually show an airflow meter fault to the degree that they can be quite poor before the fault appears. You should be getting around 58 to 61 Kg/hr air flow at idle, and full throttle under load at least 550 to 650.

If you see 48 to 50 at idle, and less than 450 under load, then IMHO the Airflow meter is near to not actually doing it's thing. This will cause fuel consumption issues.

The figures you are getting aren't THAT horrific but I agree they aren't ideal if you are driving sensibly. I, too would expect 10l/100 from a Td5.

Try a known working Airflow meter and see what happens


JC

Justin

Thanks, I had been wondering about the airflow meter. When you talk about flow rates, then presumably this is something that comes back from the Rovacom? I wonder if (now more than a year down the track) I got it hooked back up, I would discover something different about the AFM?

Ta

Owen

Originally Posted by justinc

Owen,

Firstly, Rovacom won't usually show an airflow meter fault to the degree that they can be quite poor before the fault appears. You should be getting around 58 to 61 Kg/hr air flow at idle, and full throttle under load at least 550 to 650.

If you see 48 to 50 at idle, and less than 450 under load, then IMHO the Airflow meter is near to not actually doing it's thing. This will cause fuel consumption issues.

The figures you are getting aren't THAT horrific but I agree they aren't ideal if you are driving sensibly. I, too would expect 10l/100 from a Td5.

Try a known working Airflow meter and see what happens


JC

Justin

Next question - do you have any experience with non-genuine air mass meters, such as LAND ROVER DISCO TD5 AND DEFENDER TD5 AIR FLOW METER on eBay, also, Land Rover, Car Parts, Cars, Parts Vehicles (end time 21-Mar-09 16:00:03 GMT)

I take it the genuine part is horrifically expensive.

Owen.

Hi Owen,

Using Rovacom, there can be a readout in real time of airflow.

The genuine MAF meter is the only one I have used, and they have reduced a fair bit in price now. Around $390? IIRC. The aftermarket ones ARE cheaper, but I haven't used them yet.

Should be MFK100620 as a part number?

JC

on my defender td5,, i get about 10.4 ish,, i dont fill it full,, about 75Ls an get around 750Ks on that, an thats me driving,( i do drive it hard) an alot of 4wding an mud floging, so im not complaning, but it could just be the engine, sum natruly run well an others not so, but still 11lph isent bad, my mum has a FL2 td4 an she gets 12.2 in that!!! so i wouldent worry bout it, but if you do have a prob with the MAF that could hert your LPH

Originally Posted by White 110

Well my '96 Defender does between 26 and 30 mpg

The "newer" D2 Auto TD5 only does 24 mpg

Too late at night to convert into that new fangled litres per 100kms measurement

30MPG - 9.4 L/100
26MPG - 10.8 L/100
24MPG - 11.7 L/100