AJP Wiring Loom

[itsallyellow]

Is there any difference between a 4.5 and 4.2 loom? I'm sure I remember someone saying that the throttle pot connectors are wired differently?

Have both in the floor and they look the same....

Cheers

[RichV6]

I've just bought one and Racing Green told me that one loom fits both 4.2 and 4.5 V8 cars.

Let me know how you get on fitting it as mine is still to do

[ridds]

itsallyellow said:

Is there any difference between a 4.5 and 4.2 loom? I'm sure I remember someone saying that the throttle pot connectors are wired differently?

Have both in the floor and they look the same....

Cheers

Same loom, different throttle pots to give the same function.

[Mad Mark]

itsallyellow said:

Is there any difference between a 4.5 and 4.2 loom? I'm sure I remember someone saying that the throttle pot connectors are wired differently?

Have both in the floor and they look the same....

Cheers

Message M3 John. I think that is where you are getting that from. I can't remember the outcome.

[dean_ratpac]

I had mine replaced a couple of years ago which was from RP. However there was an issue with a connector as these were not so easy to get.

However it was installed without sealing correctly, which then ended up a repair and new connector on the ECU.

[spitfire4v8]

itsallyellow said:

Is there any difference between a 4.5 and 4.2 loom? I'm sure I remember someone saying that the throttle pot connectors are wired differently?

Have both in the floor and they look the same....

Cheers

I can't remember if they're the same or not .. however the 4.5 pots rotate the opposite direction to the 4.2 pots, so if the wiring was the same and the throttle pot resistance direction the same you'd get one of the versions starting at throttle site 15 and going down to site 1 as you open the throttle
if it does turn out that way all you need to do is swap the outer wires on each throttle pot plug over, that puts the +5v input and earth the other way around so reversing the signal output, but for the life of me i can't remember if you would have to or not. try it and see? You won't blow anything up in the ecu, you'd just get a reversed throttle site versus throttle position if they're wrongly wired.

[Toadusmodus]

Early cars had a connector in the loom under the expansion tank, later cars don't, so I had to 'fill in' the hole left when replacing loom with a newer one.

[M3John]

Mad Mark said:

itsallyellow said:

Is there any difference between a 4.5 and 4.2 loom? I'm sure I remember someone saying that the throttle pot connectors are wired differently?

Have both in the floor and they look the same....

Cheers

Message M3 John. I think that is where you are getting that from. I can't remember the outcome.

Looms are the same.
The only difference is at the connector to the throttle pots. Basically you just need to swap around two wires at the t-pot plug (leave the earth alone) and everything will be fine. (I can't remember the direction of rotation but...) The throttle pots on the 4.2 operate the opposite way to the 4.5. If you get them wrong the ECU doesn't know what on earth is going on as it sees the throttles at mechanical zero but electrically it's seeing maximum throttle !