Uhh I don't believe that 1st gens have a TPS since we have carbs that are directly linked to the throttle via cables. 2nd gens have a TPS since they use FI. CAn you give some more info on the harness? Color of wires, location, etc.

 

First gens do indeed, have a tps on the rear carb.

 

It is a 3 wire harness that contains a yellow wire, blue wire, and black wire.

 

Sounds like a case of the previous owner forget to connect it after having the carbs off. :merror:

 

I have mine disconnected and permanently clocked to full throttle. It is to control ignition mapping I believe. Should give full advance at WOT...so if you set it to WOT permanently you get full advance all the time.
ac

 

Is there any way to tell where it is set without talking to the previous owner?

Also, what would be the harm of reconnecting it?

 

You will probably be better off reconnecting it. I don't know the ins and outs of the system, but if it controls variable timing it should help the engine run more smoothly, more economically, and able to take a heavy load better. Simple TPS is not enough. You need a vacuum indicator or tach cross reference (or both) for the control computer to figure out where the timing should be.

Disconnecting it will not give any more power, and under large throttle opening/low RPM it would give more torque retarded a bit.

 

You will probably be better off reconnecting it. I don't know the ins and outs of the system, but if it controls variable timing it should help the engine run more smoothly, more economically, and able to take a heavy load better. Simple TPS is not enough. You need a vacuum indicator or tach cross reference (or both) for the control computer to figure out where the timing should be.

Disconnecting it will not give any more power, and under large throttle opening/low RPM it would give more torque retarded a bit.

I agree with Andy on how the TPS works. It does not give full advance at full throttle. It actually retards it at full throttle when the motor is at lower RPM and that's what you want. It works with the tach signal. Full advance comes at a certain RPM, not throttle opening.

 

I reconnected it and did not really notice a difference. I will leave it that way it has got to be there for a reason.

 

Well, I have the Flat Slides now and when I got them I asked TWF what to do with the TPS. Zoran said to clock it to WOT and lock it there...so that is what I did!
ac

 

If you can't connect it (as in you have a different carburetor setup) then the preferable default is full advance. That's not the optimum, but it would be hard to select an optimum without a lot of dyno work.

With stock carburetors there's no benefit, and potential loss, if you disconnect it.

 

The shop manual has a procedure for setting it correctly. It's pretty simple though I don't remember all the details of it. I think you just have to measure the resistance between a couple of the connectors.