MK1 ECU/loom problems

[matlee]

I ordered a replacement(used) loom for my 1994 Eunos. It arrived today and ive just been busy trying to fit it. It was all going well until i went to connect it to the ECU. The ECU currently on my car has 2 sockets yet the loom ive been sent has 3 plugs on it for the ecu. Am i going to have to get a replacement ECU to accommodate the new loom? or am i missing something very obvious?

Any help would be appreciated

Thanks
Mat.

[beeblebrox]

Sounds like you've been provided with a loom from a later (Series 2) Mk1. These later models had a 16-bit ECU and three plugs, as opposed to the earlier 8-bit two-plug units.

What's the code marked on top of your ECU? BPF3 at a guess? I don't think fitting just the two most obvious plugs would work as ISTR they're slightly different in size, not to mention probably wouldn't connect the necessary sensors to the ECU. If you can get a later ECU (marked BPS5) you might find it works, but I wouldn't like to say for sure.

FWIW, I fitted a S1 engine into my S2 Eunos and all the sensors/connections on the engine itself were identical. I don't know if there are other differences elsewhere on the loom.

Your best bet might be to source a 2-plug loom tbh!

[Richyvrlimited]

beeblebrox said:

Sounds like you've been provided with a loom from a later (Series 2) Mk1. These later models had a 16-bit ECU and three plugs, as opposed to the earlier 8-bit two-plug units.

What's the code marked on top of your ECU? BPF3 at a guess? I don't think fitting just the two most obvious plugs would work as ISTR they're slightly different in size, not to mention probably wouldn't connect the necessary sensors to the ECU. If you can get a later ECU (marked BPS5) you might find it works, but I wouldn't like to say for sure.

FWIW, I fitted a S1 engine into my S2 Eunos and all the sensors/connections on the engine itself were identical. I don't know if there are other differences elsewhere on the loom.

Your best bet might be to source a 2-plug loom tbh!

The plugs are the exact same size, so they'll fit, but the wiring is pretty different.

The coilpacks are different on the S2 cars, there's no tacho output, that comes from the ECU. The coils will work fine though and are wired the same. OP won't have a tacho unless he changes ECU however.

I'd be inclined to source a 3 plug ECU and see what happens, everything else has the same connector/is wired up the same so it should be fine, and changing the loom again is a ball ache of a job...

[matlee]

Thanks for the replies guys. Looks like im gona have to find a loom that fits. Anybody know of anyone selling a a pre 1996 1.8 loom?

[MX-5 Lazza]

Tried Autolink / MX5 Heaven?

[matlee]

Ive tried absolutely everywhere to no avail. If anyone knows of, or will soon know of, any 1994 1.8 looms please let me know. Desperation and frustration is starting to set in!

Thanks

Mat.

[matlee]

Ignore my last post, i might have found one!

[craftythejoe]

Hey Matlee, i noticed you haven't posted about your loom Problem for a while. I was wondering if you'd sorted it? I'm building a westie with a 1994 donor and was wondering where you got your loom from, also, if you have the original? Thanks mate.