Can anyone tell me where this wire is supposed to go?

[M1]

I found this wire hanging with no connector on it so I coiled it up so as to not short on anything. It is blue w/ white trace and comes out of the main harness there behind the injector pump. The second pic is something with no wire, Im not sure what it is but it is just below the injector pump. Is that where it goes?

[PToombs]

The 2nd pic is the KSB solenoid. It gives the engine more fuel for cold starts. I can't remember what color wire goes to it, but blue with a white tracer sounds right.
If there a quite a few wiring messes on this truck, you should get a factory service manual. (FSM)
Genosgarage has them for $85. Lots of info in there!

[Begle1]

There's two wires that go from the wiring harness to the injection pump.

The first one goes to the shut-off solenoid, which is a spark-plug-esque thing on the rear end of the pump. That wire supplies voltage to the solenoid so that it remains open; without that wire the pump wouldn't be getting fuel and the truck wouldn't start (so I'm assuming that it's not that wire that's not hooked up).

The second wire goes to the little cylinder in your second picture. That thing is the KSB, which is an acronym for the German wordphrase "KaltStartBeistand", which translates to "Cold Starting Aid". The thing advances timing when it's cold out.

Now, for the earlier trucks, you could unplug the KSB in order to get the timing advance at all times. The KSB that you have is a later model, which retards timing when it's unplugged. (I think that's how they changed, I might be bass ackwards...)

You don't want retarded timing, so you should plug it back in... And even if it was the other kind, you don't want the heightened case pressures over a long period, so you should still plug it back in.

[TWorline]

I think that the blue W/white tracer also goes the fuel shut off, at least on mine it did, that is the one that got smoked all of the way through the firewall on my truck. Edit: On a closer look at your KSB it does appear to be missing a wire.

[M1]

I do have a service manual! I looked at diagrams and such but didnt find an easy answer. The diagrams give you pin locations in the plugs and what the wire does. If you guys didn't have an answer my next step was to spend some time tracing the wire to the plug. I guess I was just looking for the easy route. My service manual shows one wire to the fuel shut off so it must be for the KSB. Ill try it and see if nothing burns up! Thanks! You guys are awesome!
Matt

[PToombs]

Yes we are!

[Begle1]

Didn't they go to the short, stubby KSB in 91.5?

(And that's the one that retards timing when unplugged, right?)

[TWorline]

Didn't they go to the short, stubby KSB in 91.5?

(And that's the one that retards timing when unplugged, right?)

Begle1:

Yes you are correct on both questions.

[dpuckett]

According to my 93 FSM, the Bu/Wt is for "sensor return" Basically, it completes the circuit for whatever it is sensing. You'll find a whole bunch of them soldered together under the hood. in the wiring that plugs together close to the rear of the engine.

The KSB has a black wire.

The shut off solenoid has a solid blue wire.

DP

[M1]

According to my 93 FSM, the Bu/Wt is for "sensor return" Basically, it completes the circuit for whatever it is sensing. You'll find a whole bunch of them soldered together under the hood. in the wiring that plugs together close to the rear of the engine.

The KSB has a black wire.

The shut off solenoid has a solid blue wire.

DP

Damb! wheres my black wire? So where does the blue white go?

[TWorline]

Whoops DP is correct it was the blue wire that I smoked, dang bifocals!

[M1]

I just dug a little deeper into my service manual and found a blue/white wire to the cold start advance. Ill plug it in now!

[PToombs]

I'm glad I can read a schizomatic and have my own FSM!



Still love you guys though!

Not sure about DP, and that nut thing.

[dpuckett]

Pete, there were some color changes between 90 and 92.5

DP

[TWorline]

(And that's the one that retards timing when unplugged, right?)

Well I thought it was... but maybe not I got corrected over on TDR on the same comment. OK guys which way is it?