3.9 engine wiring loom help please.

Hensen1954

Hensen1954

Active Member
Just got a loom, and ECU and new air flow meter.
However, although some of the loom connections are obvious, I have a few that I dont know where they go or what connects to them. Here are the photos of the problem ones.

This one is near the ECU...



These 3 are very near the ECU.



These 2 are between the ECU and where the loom goes through the bulkhead..




This one is on a long lead that joins the loom on the engine side of the bulkhead..



This one joins the loom at the same junction as the lead that goes to the stepper motor..




This one is further along the loom, close to where the pass side injector wires join the main loom..



This single one is joined to the main lead that goes to the air flow meter..




This is the type of dizzy I have with a 2 pin connection.



Finally, this is the coil as fitted to the car that the 3.9 has been transplanted into.



All help appreciated, need to get this bugger up and running. However, just to cause more problems, when it does start, it might need ECU mods as the block is a genuine 5.0 stroker motor.
 
Some will be for guages I think.

Best to get hold of a diagram and compare colours to be sure.

Colin
 
The 2 black ones in the second pic are relay connections. I'd be getting a wiring diagram for the others..m
 
Is the loom from a V Belt or Serp engine? Serp ones are a bit more integrated with the vehicle wiring so will have a few extras that don't need connecting.

Pic 1, unsure but I don't recall it as vital for running the engine.

Pic 2, relays go in here, they need to be 5 pin type. 4 pin ones will fit, but it needs the 5 pin ones.

Pic 3, the white plug has the main feed wires you need to connect. There will be the power feed to the fuel pump, along with the ignition live and permenant live. Be sure to fuse them.

Pic 4, can't remember what it does but not required to run.

Pic 5, O/S Lambda sensor

Pic 6, N/S Lambda sensor. If you're running lambdas make sure you have the correct type (the fucking expensive ones) or the engine won't run correctly. 14CUX sensors have a different working range to generic ones and will screw your fuelling up something chronic. If you're running without then make sure you have the right tune resistor fitted (the blue 2 pin plug in picture 2)

Pic 7, Rpm pickup, either connect to the negative terminal on the coil or the dizzy.

Pic 8, can't remember which way the dizzy is wired, fairlying certain the top of the T is live, and the other bit to the coil negative. You can share the coil live for the dizzy too.

You will need the ecu remapping before you run it in anger. The 3.9 ecu will run it, but use in anger will eventually result in melted pistons.
Speak to Mark Adams about one of his chips. He'll help you get the best out of it.
 
Still need more info please,
still dont know where this brown plug went to or what it does.........



This flat spade connection maybe went to the coil or distributor or something else completely, if the coil, how is the dizzy connected to the coil, etc, as both have 2 connections.



I have 3 relays, but they all have the same fittings, so I dont know which relay goes to which receiver plug.





What did this vacuum connection originally connect to ??



Still not sure how to connect up the dizzy, which termainal does what ??



Where does the vacuum hose from the fuel pressure regulator connect to ??




I am assuming this is the main plug that connects to the car, if so, which wire does what ??



What does this black plug do - its quite close to the previous main plug.




All accurate help appreciated.
 
A remark about your relays: the orange one is actually not a relay. It contains diodes. On of the relays is for the fuel pump but i doubt if the relays connection positions match with the blocks
A remark about the dizzy: the front or left connection on your picture goes to the - on the coil and the right connection on your picture goes to the + connection on the coil
Regards

Peter
 
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