We got the 13B n/a into my 1990 FC last night, it runs fine, timing is dead on, but i do have a couple of problems....

1. There is one connector that we could not find where it went. It is a round black connector going to a green wire with a black stripe. When we took the car to my buddy's shop, and pulled the code 9 that the engine had thrown, we found out that this was the thermosensor for the ecm... however, we cannot find anywhere where this would plug in, not anywhere around the water pump.

2. We have a coolant leak.... possibly related to the sensor problem, as it is coming from somewhere on the top of the motor. We're pulling the top end off again tonight to find out where exactly...

3. Speedometer doesn't work...... ?

4. Fuel level gauge doesn't work either... upon searching it seems i have to reground the tank?? How is this done?


thanks guys

-dirk

 

get a few pictures and we could be more helpful. My Engine went in and I had one wire as well, it was for the electronic fan switch, which my car doesn't have. I think it was that same black/green stripe wire.

 

You about the one millionth person to ask about this... It's for the thermoswitch on the back of the water pump, next to the ECU thermosensor. It controls the auxiliary electric fan in front of the radiator. If the car didn't come with the fan, then it won't have the switch either, so the connector is unused.

The ECU thermosensor is a completely different beast, not related to the fan thermoswitch at all, other than being in about the same location. If you have an error code for it, make sure the connector is secure. Follow the procedure for that error code in the FSM.

It's not likely related unless you removed the thermosensor from the back of the water pump. Check the three hoses that go from the rear plate to the thermowax, the thermowax to the BAC valve, and the BAC valve to the back of the water pump.

Cable not connected at one or both ends, or cable snapped internally.

Dunno where you got that idea, but it won't do anything. Did it work before? Have you messed with the fuel pump at all? The level sender is part of the fuel pump assembly.

 

Hmmmm ok, so that other green connector (not sure of the wire color) by the water pump close to the alternator is the thermosensor for the ecu? I thought that would be for the gauge.... where is the thermosensor for the gauge then?

I'll take a look..... maybe my car used to have an electric fan and doesn't anymore? I just bought this car a couple of months ago as a project car...

Will do, thanks

I'll check it.... i tried to pull the gauge cluster out yesterday, but it doesn't come out far enough? I'm guessing the wires are at their max length behind the cluster.... is there no way i can get behind the cluster without taking the whole dash apart?

Don't even know if it works, because the tank was empty when i got the car a few months ago, and the engine was blown.... this is the first time it has ran for me... the fuel pump works fine though

 

The sending unit for the water temp gauge is on the driver's side of the engine, very near the oil pressure sending unit. Look just in front of and below the oil filter pedestal.

The speedo cable is what is hanging you up- NOT the electrical connections.
Some people claim to be able to reach around and undo the gauge-end connector but since my hands are three dimensional, I can't. Undo the cable at the transmission and push some slack through the firewall and the cluster is much easier to disconnect.

 

The water thermosensor has two wires. One is green/white and the other black (in some cases brown/black).

The grounding of the fuel tank was a hoot.

The auxillary fan would be located in front of the air conditioners condenser or in front of the radiator. Small six to seven inch fan. Electric.

And I put some suggestions on your other thread in the other forum.

 

No need to undo trans side of cable. There is enough slack in the cable to just feed a little cable through the firewall and fit 3D hand behind cluster and undo speedo cable at the cluster.

 

wow, thanks for all the help guys..... i'll be workin on it most of tomorrow, will get pictures hopefully

 

Yeah the cable just snaps bak on with ease, it comes off pretty easy as well unfortunately.

 

Here.

As mentioned, it's the speedo cable that's causing you grief. Ironic... Try having someone push on the cable from the other side to give you more room to reach behind the cluster. And if you you think getting it out's hard, wait for the reinstall...

Nope...

See the Troubleshooting Guide on page T-38 of the FSM Body Electrical chapter.

 

There sure isn't with mine, besides, undoing the cable is how I discovered that the speedo drive gear seal was bad which saved me from the "oil leak on my knee" mystery game.