Thread: 90s Disco EFI wiring

Where is the plug located?
I can have a look at my 92 range Rover and see if you like.
Regards Philip A

Originally Posted by PhilipA

Where is the plug located?
I can have a look at my 92 range Rover and see if you like.
Regards Philip A

Thanks Philip... I think the plug appears just inside the firewall in one of the footwells, but of course I can't say for sure since I just have a loom outside a car.

However, I think I've got the answer on the OL forum... so no need to go to any trouble!

Cheers,

Jason

Originally Posted by anthropoidape

Thanks Philip... I think the plug appears just inside the firewall in one of the footwells, but of course I can't say for sure since I just have a loom outside a car.

However, I think I've got the answer on the OL forum... so no need to go to any trouble!

Cheers,

Jason

Can you share the answer with us, then we'll all know if it ever comes up again.

Thanks

Originally Posted by ladas

Can you share the answer with us, then we'll all know if it ever comes up again.

Will do, as soon as I know it works!

Okay, the job's done!

Here's a few pics for you:

Before, with carby:



After, with EFI:



(The vehicle is a Triumph Stag. Also please note that there is one hose connected incorrectly in the EFI photo, which I've since corrected.)

Obviously I still have some tidying up to do, but it runs nicely; in fact it started first turn of the key and runs (and especially starts) so much better than with the Holley.

The basic answer to my question above came from Tony on the OL forum:

Originally Posted by ruff

I just fitted an early disco 3.5 EFI kit to my hilux. This is slightly different in the wireing on the 3.9 but is prob the same to wire.

I only had to hook up 3 wires to get this to run.

Brown wire- Battery +
White with a Red Trace- Ignition Sorce
White with Purple Trace to Fuel Pump +

There is also a White with a Yellow trace that is the Check engine light but i havent added this yet.

And it runs perfect.

It's really that easy, and I only have a few things to add:

- Some wires are a different colour on the EFI part of the loom to their colours on the rest of the Disco loom. For example the "white with red trace" on the EFI loom hooks into a plain white wire on the main loom.

- Be very careful not to confuse water pipes with vacuum pipes, for obvious reasons! I didn't, but in retrospect this was partly due to luck.

The work in doing the conversion was not in the wiring or the bolt-on stuff. The toughest part of the job was running fuel lines. On the Stag, the existing fuel line (tank to carby) was plastic. With EFI, you need a return pipe as well of course, so I ran two steel pipes which I stole from under a wrecked Suzuki Sierra (any car would do of course). This is a nasty job in cramped quarters, keeping the pipes away from anything hot or anything that might rub them. But, I think, worth it compared to running rubber hose. I just don't feel confident enough that I won't spew fuel on the road one day if I have too much rubber hose under the car.

Note that you need EFI hose not normal fuel hose, too.

The other fiddly part was the coolant system. It was rather different between the old (1982 rangie) manifold and the newer 1991 disco efi manifold.

If anyone wants the detail there let me know and I'll explain

I hope the above info helps the next person doing this. It's certainly worth it if you can get the parts at the right price, and the important stuff bolts on with no modification at all.

One last thing, I have not yet hooked up a throttle cable setup, which looks like I'll need to custom make it. No biggy, and I am sure this is easier when doing the swap into a car that originally came with a Rover V8.

Jason