What is this plug on the engine loom?

Post by **Merlin** » Mon Mar 14, 2016 12:42 pm

What plug is this on the UK 4th gen engine loom? I assume the other one is for the VSS, but I am stumped on what the other one is. I have been looking through the service manuals but haven't found it yet. The mystery plug is right under the intake manifold, slightly on the gearbox side. I have pointed to where it attaches onto the engine loom.

'92 Si VTEC · Post by **jjmartin349571** » Mon Mar 14, 2016 12:54 pm

It's not for the mystery cold boost thingy is it?

Post by **Merlin** » Mon Mar 14, 2016 12:55 pm

The air boost valve? I think that is only on JDM engines. Also it is not for the IAB vacuum tank, I have that attached already and it is a different connector.

'92 Si VTEC · Post by **jjmartin349571** » Mon Mar 14, 2016 12:58 pm

Ah yeah, air boost is what I was thinking. I'm pretty sure that's a UKDM thing though, there was a thread about it at some point?

Post by **RattyMcClelland** » Mon Mar 14, 2016 1:09 pm

George foreman grill harness.

Post by **Merlin** » Mon Mar 14, 2016 1:18 pm

jjmartin349571 wrote:I'm pretty sure that's a UKDM thing though

You may be right, I didnt have one on my 5th gen JDM engine.

RattyMcClelland wrote:George foreman grill harness.

If only!!

Post by **Merlin** » Mon Mar 14, 2016 2:56 pm

This is what the 4th gen service manual says, there is no legend though so there is no description

Post by **Merlin** » Mon Mar 14, 2016 3:02 pm

It must be the O2 sensor.

I wont get very far without that plugged in.

@Vanzep

Post by **vanzep** » Mon Mar 14, 2016 6:10 pm

so definately the O2 sensor then? i know its at the back of the tb on the loom but seems a bit short - i guess you can add some wire if needed

i thought it might be to do with the air intake meter box thingy -the one that at the back of the battery and opens and closes the butterfly in the resonator which you dont have - so dont need it?

edit- no - is it the connector not the injector resistor box - th one that sits on the firewall?

i dunno - lets fit the engine in and we will find out

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Mon Mar 14, 2016 6:34 pm

Air boost valve is UKDM, but you say that plug is over towards the gearbox side, so I don't think it can be that because that valve is towards the flywheel end of the IM (from memory...) so that wouldn't reach I don't think?

I can't recall if I took pics when I disconnected everything on that loom, or not. I'll have a dig back and see... If not, I can check the engine it came off, next time I'm over at the barn.

Edit: I can also try and have a look on my UKDM on the drive tonight, though won't be easy cause of access and it's dark...