i need help sorting out these wires that hand in my engine compartment.
1st)by the battery, blue plug 1)blue/white(IAC groud?) wire 1)red
2nd)under intake manifold 1)white wire w/red spiral stripe(it looks spiral) this wire has a female connector(same as knock sensor,oil press. sender...) and the plug has a unprotected end
3rd)also under the intake manifold 2)orange wires that meet a connector. this connector is male(same type of connector) and has a hard black plastic cover.
4th)on the firewall behind intake manifold,beside the big white plastic connector is 1)is a blue wire with a female plug of the same type. the wire has a red jacket covering the first inch or so. It also has a hard black plastic cover
5th)on the firewall, passengers side there is a plug that is the same type as my coolant temperature sensor(2 prong ruber volvo plug) it is 1)yellow w/ red stripe and 1) black wire

I would love it if someone could shed some light on this topic for me. I just cant seem to figure it out with just my haynes manule, I am also afraid to try experimentaion for fear of breaking something. Thanks for any and all responses.

Hi Kenneth,

Wild guess here, are you replacing your FI harness?

1) the blue/white is what you said, IAC test ground. The red (pink) is a test point used to adjust AMM pot for mixture. On the B23F (LH2.0) an analog meter is best used to view the rich/lean transitions.

2) White/red is generally used for ignition (coil switched side), although I can't recall that exact connector. You have a GL, maybe that continues the ignition signal to the tach, but I thought on mine it was the shielded gray wire that did that - to pin 1 on the ECU.

3) Orange is used for the on-idle switch of the TPS. The connector is there I think, to join with the ignition harness to provide TPS indication to the ignition computer mounted on the windshield washer bottle.

4)The connector you describe here is a starter access. Hit it with 12V and she cranks.

5) This one powers the heated oxygen sensor yours probably doesn't have. If you have a one-wire lambda sensor and that empty connector, you have a replacement harness, or a late 84 someone has fitted with the less expensive unheated sensor. It should just provide +12 switched and ground to the lambda sond's heater.
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Art Benstein near Baltimore

No, not the fi wiring harness, although i wish i could afford it. I have run up on these wires/ copnnectors in the process of trying to eliminate the possiblity of wiring problems as i try to make my volvo run better. The last owner told me about the incredible knock/rattleing sound the engine made. He said he had tried everything. I guess everything included disconnecting all of the sensor wires that didn't cause the car stop running. After reconnecting all of the sensors, and retiming the engine, my volvo does not have a problem with knock/rattle anymore. I also have a slight stumble on takeoff and thought perhaps one of these connectors should be plugged in. Should I be looking for a place to plug any of these in? Thanks for your help. Kennethcardell

The one question of the five loose ends you mention, is the orange wire. That sounds like the stumbling problem.

Going by memory, the V/C ignition needs to know when you come off throttle closed, and it gets this information on an orange wire.

In order for it to get that info, there needs to be a connection from the TPS, which is joined using the FI harness, to the V/C computer (ICU) which is wired with the ignition harness.

Check to see if something coming from the same bundle the distributor wiring and knock sensor wiring is in, is disconnected from the bundle carrying the wires to the coolant temp sensor and idle air valve.

The only connector i can find is the white wire with the red spiral. All of the others are either female, or has already been described as something for someother use. How would i be able to tell if i could try hooking up these wires without fear of damaging my computer/ignition mod.? Thanks kennethcardell

Hi Kenneth,

I have to admit it sounds as though your 84GL is no longer wired the way it was when it left Europe. Perhaps your P.O. has done some work...

White with red tracer is used in several underhood locations, for AMM and lighting too. I can't think why it would be under the manifold.

How would i be able to tell if i could try hooking up these wires without fear of damaging my computer/ignition mod.?

I'm not one to shy from wiring, but I would not ever plug the unrecognized into the unknown. Instead of guesswork, try to determine which harness swallows up that red/white, i.e. what other plugs come from where it comes from. Match the harness part number to those for your car (use Dave Barton's site as a reference) to find whether someone has replaced things with the wrong (LH2.2?) wiring. Get hold of your P.O. buddy and ask some pointed questions??
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Art Benstein near Baltimore