I have swapped a 350 Carb'd into my bird and was wondering if i still need my ecu and what wiring i really dont need, i switched the LG4 our ffor the 350, its ready to go just need to know what wiring i need in the engine bay or not, and i have the autozone wiring diagrams they arent very useful anymore!!

So any help will be very useful.

 

Any particular reason you aren't running the original carb and distributor?

 

That One isnt completely computer controlled, and the other is its better condition, and the distributor would fit theblock was bout 1/4 too long.

 

The ECM wires go to the passenger side fender well. You can disconnect the plug that goes through the kick panel there (remove the plastic fender liner, it's easier to see then), and just pull that harness out of the engine compartment. You shouldn't have to cut anything.

If you keep the TH700R-4, you'll need the lock-up wiring that goes down to the tranny. Either that, or find another connector and rewire that system.

Otherwise, the necessary functions come from other connectors.

 

Well i kept my Top Gear Switch, Converter Control Solenoid Wires. Now Can i Plug The ECU back in with everything else cut?

 

So i could just totally take the ECM out completely(wiring and all)?
But what about the relays and everything, and wont some of my gauges stop working like Temp, Oil Pressure, Fuel, Cooling system?

And what is a AC Spark Plug Module(ithink that is what it said)?

Also what in the H*** is a Barometric Pressure Sensor?

 

Spark module, perhaps? Knock sensor. Won't work without a functioning ECM.

Ditto the BPS. Part of the input for the computer to make mixture and spark decisions.

The gages don't go through the computer, and aren't part of the computer harness. I don't know how many times that has to be said (say it all the time when the topic comes up), but the gages aren't affected by defeating the computer.

The "Top Gear Switch", aka 4th gear switch, is also information to the computer. If you don't provide the other inputs the computer is looking for, such as throttle position (provided by the computer controlled carb) or engine speed (provided by the computer controlled distributor), then the 4th gear information is moot - the computer won't lock up the torque converter.

You can use a normally-open 4th gear switch to provide the TCC solenoid ground path to lock the TCC - it will lock anytime the transmission is in overdrive and the brake pedal is up. Some people have provided TCC lock-up after defeating the computer system by doing it that way.

 

So if i keep my Top Gear Switch, Throttle Position sensor, and Engine Speed(Tach) i should be fine untill i get a lock up kit right?

 

You have to rewire the TCC circuit to get it to work with the 4th gear switch only. Most 3rd gen TH700 4th gear switches are normally-closed.

You can't keep the TPS unless you keep the CC carb and distributor.

You can't keep the engine speed sensor unless you keep the CC carb and distributor.

Basically, this stuff doesn't work unless you keep it all.

 

Well then what do i have to do and not buy some lock-up kit, and it still lock up.


OH AND FIRED THE ENGINE UP TODAY AND SUUUUUUWEEEEEEE!!!! MAN IT SOUND REAL GOOD WITH A LIL TUNING AND SHE WILL BE READY!

 

Stock, the power for the TCC lock-up comes from the brake light switch. It goes to the transmission through the 4-prong connector, to the solenoid, from the solenoid to the normally-closed 3-4 switch. Then back out the 4-prong connector to the ECM, where it is grounded to produce lock-up.

If you take the wire from the 3-4 switch, and route it to a single-pole normally-open 4th gear switch, when the transmission shifts to overdrive, the TCC will lock.

 

Is the 3-4 on the passenger or driver side?

 

Been a few years, but as I remember it, the 4th gear is on the passenger side, the 4-3 next inboard from it.

(Should have been calling it the "4-3 switch", because it detects the shift from overdrive to 3rd.)