Thread: DonDownUnder's D3 dropping into Limp Mode

Mine had similar symptoms and was due to the intank Low Pressure Fuel Pump failure.
A good read is the excellent Robbie's guide to the LPFP.

DISCO3.CO.UK - View topic - Robbie's Guide To The Low Pressure Fuel System

Cheers
Peter

I reckon you could be on the money. I can see a receipt for a brand new High Pressure Fuel Pump not that long ago but can't see a Low Pressure Fuel Pump receipt. Worth a shot for a small investment.

Using a clamp on ammeter as per Robbie's guide, you should be able to check current draw of the LPFP.
Low current draw will be a LPFP failure, whilst ok current draw may indicate a blockage with either the main fuel filter or the sock filter on the end of the LPFP.

Whilst in the Kimberley, i had apparently picked up a load of contaminated fuel and went into limp mode. Had to drop the main tank in a paddock at Mt Elizabeth Station and clean the black gunk of the sock filter on the LPFP. Lucky only had about 40lts in the tank. 5.5 hrs later we were on our way!

Cheers
Peter

Jono.
You could try sending an email to him thru AULRO.Look for the link in his avatar.
Andrew

Will give that a shot. Online pricing for a new pump seems to be around the $400 mark so would rather properly diagnose first.
It's plausible that the sock may be plugged up too. It's amazing how easily a filter will turn black and gunky. Have a V8 Cruiser ute and every 10,000klm, the filter is as black as soot and almost looks as if there is algae growing.
I may have to drop the tank anyway as my wife hates the spare tyre carrier on the back. Sadly the long range tank may be going so the spare tyre can be relocated back to it's factory storage. I keep putting it off so I can keep it in.

Ah damn, I'd nearly rather keep the tank and throw the spare on the roof.
There's only really 2 things people don't like about Disco's. 1 being the tank is about 30L shy for touring and 2nd is the lowering at 55km/h which llams fixes... Be a shame to lose the fuel capacity.

On the roof! Now there's an idea! Maybe the mrs will let me keep my long range tank after all.

As for the limp mode, the earth from the battery to the inside fender looks a bit loose when I jiggle it. Might give it a tickle with the old spanner and see if that improves anything. I cleared all these silly module communication fault codes which seem to point towards a bad earth.

I experienced this sort of silliness with my X5 Sport. Running around in circles scratching my head, replacing part after part trying to clear a misfire. I've learnt to not stress over it. I'm sure it's something simple. Just need to diagnose properly.

I had a quick poke around on the forum and found this:

"Left Tamworth after replacing Bulbs and Brake switch. Thought I had it beaten. 20K short of Toowoomba Ding Ding Limp mode.
Off to the Landrover dealer workshop.
Now fixed hopefully. Fuel Rail pressure barely making 160MPA and only under tow load.
So New lift Pump, Filter , Injection Pump & Belt, Several sensors, and replaced some corroded elect plug terminals to sensors and engine ECU and FPCUnit A lot of hard work. Took 3 weeks to trouble shoot and fix.
Just about a new vehicle now so will have to last till we are too old to caravan around"

I guess I can cross off the lift pump and injection pump. I think I need to check all the earth's and find some way to check the electronic accelerator pedal. It may be junk..

Worth adding, the Alternator packed up last week. I replaced it with a brand new one. I hoped that was causing the limp mode drama. Apparently not.