Ladies and gentlemen, I'm not entirely sure what a wit is but I'm very much approaching the end of it!
I've an X reg discovery 2 v8 (thor engine) RHD which has developed a pretty irritating intermittent (even more irritating) fault. Crack her up, runs beautifully, sounds the tits, great stuff! However! After a length of time that only she decides.....it cuts out, instantly, no splutter, nothing! No it is not the crank sensor... there's no pattern or any amount of wire wiggling that will cause it to do or not do it so I went down the process of elimination route, I have changed for genuine or known good as follows.....
Crank sensor
Cam sensor
Maf sensor
Ambient air sensor
Coolant temp sensor
Engine bay fuse box
Interior fuse box
Ecu, bcu and ignition coil
Coil packs
Inertia switch
Fuel pump
Brand new 95Ah Varta battery
Throttle body
Idle control valve
Disarmed immobiliser

Now if I have my nanocom or solus plugged in at the time it faults it kicks me out suggesting power loss to the ecu.
I've tagged a bulb in to f1 and f12 in the engine bay to rule out fusebox issues and neither of them flicker when she dies.

Have I missed anything? Is there any electrical fault areas I could check? I've checked and cleaned multi plugs in passenger side footwell mind

Any help would be very much appreciated as I fear she may soon have a date with Billy blue nose and the local scrappy!

Thanks in advance, Ash

Ashs1 said:

Now if I have my nanocom or solus plugged in at the time it faults it kicks me out suggesting power loss to the ecu.

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That phrase is not clear for me, so you can communicate with the ECU untill the fault occurs and then the comms are lost or what do you mean? Anyway, as you replaced almost everything IMO there is a bad contact/wiring issue somewhere which can be the worst nightmare

sierrafery said:

That phrase is not clear for me, so you can communicate with the ECU untill the fault occurs and then the comms are lost or what do you mean? Anyway, as you replaced almost everything IMO there is a bad contact/wiring issue somewhere which can be the worst nightmare

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That's correct yes, when the fault occurs communication is lost with the ECU. I was fearing it may be a wiring fault, I'm dreading digging deeper into it. Thank you for your reply Sierra.

But while it was connected didnt you try to read fault codes? plug in nanocom and just turn ignition on without starting it and read codes if you can

These V8 Discovery's are very cheap to buy.

I'll stab in the dark and say fuse box problem

kermit_rr said:

I'll stab in the dark and say fuse box problem

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Re-read the first post

sierrafery said:

Re-read the first post

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But are we sure?

kermit_rr said:

But are we sure?

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Never

I definitely agree with the suggested wireless issue. Start checking your earthed grounds.

sierrafery said:

But while it was connected didnt you try to read fault codes? plug in nanocom and just turn ignition on without starting it and read codes if you can

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Yes, no faults shown unfortunately on either the nanocom or the solus, I was reading live data looking at rpm, voltage etc when I lost communication. Bloody thing. I can try fuse boxes I suppose, I've had a mate print a pin out diagram for the ecu off autodata so might see if I loose voltage to the ecu through the wiring. I was dreading it being the wiring but it seems to be the only thing left thanks again for your replies guys.

You better find an engine main harness in good condition and replace that one