My 2003 TD6 Vogue ,has a great problem,sometimes when i turn it off the key comes out,but the engine still runs,i have to remove the battery earth lead .BUT it still runs until i turn on everything Electrical to power it down,i have rang a good friend Les Potts from Sunderland who has never heard of this problem,any ideas Guys,many thanks Dave. Mercedes AMG w207
E class Cabriolet
Overfinch L322 4.4 tdv8
1987 sierra rs cosworth 3 door white.
1985 escort rs turbo series one.
1992 sierra sapphire 4x4 cosworth red
1993 sierra sapphire cosworth 4x4 silver
1993 sierra sapphire cosworth 4x4 white
1995 ducati 916sp.

I heard of this on a P38 diesel. A farmer friend had one and had to carry around a container of water to throw onto the diesel pump. I watched him do it one day when he turned the ignition off and the engine was still running, he walked calmly as anything around the front, opened the bonnet and poured water on the pump, sure enough the engine stopped.

I’m sure there’s something about later l322s running on and it’s to do with oil burning in the cylinders, give it a search on here I’m sure you’ll find it.... ______________________________
Simon
______________________________

Range Rover Classic 3.5 efi - Gone
Range Rover Classic 3.9 efi - Gone
Range Rover Classic 4.2 LSE - Sadly gone
Land Rover 110 3.5 - Gone
Range Rover P38a 4.0 SE - Pleased it's gone
Range Rover P38a 2.5 DHSE - Just sold
Range Rover L322 4.4 v8 Petrol - Current

sounds like diesel runaway - lots of stuff online about it and some interesting videos on youtube.

the engine will be either running on excess fuel as a result of knackered injectors or some other failure in the fuel delivery system. Or its running on its own oil - maybe due to a leak somewhere internally.

as yours does it a bit and then stops i would suggest excess fuel draining from somewhere, maybe fuel rail? once its gone the engine stops.
lots of online accounts of engines running on there own oil until either the oil is gone or everything has completely overheated and seized. often revs keep on increasing too.

i would suggest you get this looked at straight away,

IT WILL REV UP PERFECTLY,ALL THE ELECTRICS WORK AS THEY SHOULD,SO I THINK ITS AN ELECTRICAL FAULT,TO HONEST. Mercedes AMG w207
E class Cabriolet
Overfinch L322 4.4 tdv8
1987 sierra rs cosworth 3 door white.
1985 escort rs turbo series one.
1992 sierra sapphire 4x4 cosworth red
1993 sierra sapphire cosworth 4x4 silver
1993 sierra sapphire cosworth 4x4 white
1995 ducati 916sp.

how long does it run on for?

I think it is an electrical fault as well. You haven't fitted any relays or led lights lately by any chance?

Some times i have to disconnect the battery earth lead and turn on everything electrical and can still take 2 minutes or so,other times it will just stop itself if everything electrical is on. Mercedes AMG w207
E class Cabriolet
Overfinch L322 4.4 tdv8
1987 sierra rs cosworth 3 door white.
1985 escort rs turbo series one.
1992 sierra sapphire 4x4 cosworth red
1993 sierra sapphire cosworth 4x4 silver
1993 sierra sapphire cosworth 4x4 white
1995 ducati 916sp.

if you disconnect the battery and it continues to run im not sure how it can be an electrical issue? the engine is getting fuel or oil or both after key off allowing it to run. if you have disconnected the battery it can only be from worn components nothing is actively electronically operating?

The only way to switch a diesel off is by removing the fuel source. When you turn the car off what you are actually doing is isolating the fuel supply. This is why a diesel doesn’t have spark plugs as the diesel ignites when compressed and will just keep running regardless of the battery being disconnected.

It will be an electrical fault on the solenoid on the fuel pump.

Jim

if the fuel pump relay is stuck closed so powering the fuel pump even after ignition is off, that is the low pressure end. the injectors are all electronically controlled so how is the low pressure fuel getting into the cylinders after key off with the injectors all closed...?

did you get anywhere with this Dave?

Bit late to the party with this but years ago had some thing like this with my first classic, fitted extra earth leads between engine and body and body to battery cured it.