Disco 2 First Few Days with 4.0 V8 LPG

Hi all,

Ive had my D2 now for a few days and so far I love driving her. Had her booked in for new rear wheel bearing as it was noisy when I picked her up (and an advisory on the MOT), on my way to the garage the fuel line decided to disconnect from the fuel rail, loosing 30 litres of petrol in the process.

The engine was rebuilt 6 weeks ago by a LR specialised after the head gaskets went and she was serviced at the same time. I drove her home on LPG and did 165 miles for 68 litres which to me didnt seem too good, seeing as I cruised at 65 on the Motorway and A roads using the cruise control for 100 miles of that. I have no record of the LPG (PRINS) system being serviced. I will get that done next week will that improve the MPG?

Im getting 15 MPG on Petrol on dual carraigeways again using cruise (my thinking cruise is efficient but I may be wrong), again thinking it should be a bit better.

Any ideas what to look out for to improve will help.

Thanks

Bruce

We get 155 miles on 48 litres in mixed driving, ours is a Zavoli multipoint LPG system

There is no servicing as such, apart from changing the LPG filters in the line(s) from the vapouriser to the injector blocks.

The sort of thing that affects them is faulty Lambda sensors and just generally badly set up.

Pity you're so far away, we've got the software for the LPG controller on our laptop.

There should be a 6-pin block connector on a short cable coming out of the LPG ECU, if you can't find it, you may be stuck with what you have as the ECU programming and updating is done through that interface.

Peter

listerdiesel said:

We get 155 miles on 48 litres in mixed driving, ours is a Zavoli multipoint LPG system

There is no servicing as such, apart from changing the LPG filters in the line(s) from the vapouriser to the injector blocks.

The sort of thing that affects them is faulty Lambda sensors and just generally badly set up.

Pity you're so far away, we've got the software for the LPG controller on our laptop.

There should be a 6-pin block connector on a short cable coming out of the LPG ECU, if you can't find it, you may be stuck with what you have as the ECU programming and updating is done through that interface.

Peter

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Thanks Peter for the reply, much appreciated and yes it is a shame we're so far away.

As far as I know I have twin 40 litre tanks in place of the original fuel tank and a replacement 40 litre fuel tank. The LPG guage goes red after 70 miles or so but i drove it another 90 miles before it started beeping to turn over to petrol. I thought the guauge should measure the total amount in both tanks? The is a LPG specialist here in Plymouth, would he be able to do some diagnostics?

I presume there is not need to tune these engines now as they are all electrical. Could incorrect spark plugs cause such bad MPG?

Thanks

Bruce

You only have 80% of the tank's gross capacity available, so 64 litres +- 2 or so, and fill quanity does depend a bit on ful pressure at the site.

There is usually only one gauge fitted and used.

I can't comment on your local guys, all my contacts are up this end of the world.

The standard plugs are fine on LPG, some open the gaps up but I've never bothered. My last set of plugs were still running 65k miles after fitting, but I put a new set in as we were towing our big trailer in Europe.

Peter

Are you sure of the capacity? Ours are 30 litres X 2, under the body sills, that's the largest you can get under there between the body brackets and the chassis and outer sills.

We kept the standard petrol tank.

Peter

I think so. According to the paperwork and certificate when it was done (2005) it has 2x40l tanks in place of original fuel tank and seperate new 40l petrol tank fitted all connected to a PRINS system and cost £2400

OK, that sounds definite then.

In our experience, keeping the standard petrol tank is far more useful, especially if you're in the middle of nowhere and no LPG.

Ours was done in 2005 as well, the tanks should be inspected at 10 years, no need to replace them if they are in good condition, but an inspection of the straps and mountings is recommended.

Peter

Thanks. Going to get them checked out as they there was also an advisory on the MOT saying there was some corrosion on the tanks, it looks surface rust but will have a closer look.