Hot Rod Forum banner
1 - 16 of 16 Posts

·
Old(s) Fart
Joined
·
6,016 Posts
saskroughriders said:
its a 1987 700r4 and the engine is anywhere from 88 to 92 im not sure cuz it wasnt original in my parts truck
Sorry if I'm dense here, but I'm not asking about the new 700R4. I'm asking about the truck (and computer) that it's going into. What engine and trans was that computer set up to operate originally?
 

·
Old(s) Fart
Joined
·
6,016 Posts
The 1987 computer and wiring harness should already have a four pin plug for the transmission lockup function. This should be a four pin square plug (terminals oriented 2x2) and may or may not use all four pins. Of course, the computer requires that you also use the TBI and sensors from the original truck to know when to lock up the converter. If you are not planning to do that, you will need to either use an aftermarket lockup kit or a toggle switch.
 

·
Saitek5678
Joined
·
94 Posts
saitek5678

Hey! how ya doin? The wiring has to "jive with your stuff", Trans, ECM, engine, sensors need to "hook up". they may not be compatible. In other words just because they bolt up may not mean it will work. Take all the **** off the old engine and put it on the new, or maybe a different wiring harness or ecm, if it doesn't all plug in.......Your ****ed
 

·
Registered
Joined
·
10 Posts
Discussion Starter · #12 ·
thamks everyone and i think all that should hook up because its all comin out of a parts truck which ran before i took everythin out lol this is my first engine / transmision swap and all ur help is appreciated im proud of bein like the only kid in my town who doesnt drive a cavalier civic etc. :thumbup:
 

·
Old(s) Fart
Joined
·
6,016 Posts
saskroughriders said:
o and tbi is just another name for the injectors then lol got it
Well, specifically, TBI (throttle body injection) mounts the injectors and sensors in a throttle body located in the same general place as a carb. This is different from port injection, where there is an individual injector for each cylinder. The 87 trucks used TBI and the computer will be expecting to get inputs from the sensors associated with the TBI unit. These sensors (vehicle speed sensor, throttle position sensor, manifold air pressure sensor, coolant temp sensor) are used to determine when to lock and unlock the torque converter. If you are not using the TBI system and associated sensors, the computer won't be able to control the trans.
 
1 - 16 of 16 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top