Thread: toyota 3.4 in race truck help please??

i have a 94 pickup with a 3.4 swap everything works and runs fine, but i am going to be stripping it down, caging it, and making it an offroad only prerunner and eventually race, I would like to minimize the wiring for the engine and everything else to keep it simple and easy to work on and troubleshoot, my question is which wiring is needed to keep the engine running correctly and which can i eliminate? i know there is alot of race trucks and prerunners that have 3.4s in them or used too, and am looking for some help to save me a tone of time with the wiring diagrams. a contact or anything would be nice because im out in colorado and very few have any idea what im talking about. any insight would be appreciated, ive searched everywhere with no results

i got a stand alone kit from a guy in flagstaff but went out of business,but all i was left with was what comes behind the throttle body and between the valve covers i could send you pics or some info if you'de like....

its really not that hard to figure out. are you trying to eliminate the wires in the engine bay or inside the truck?

trying to eliminate as much as possible to keep it simple and wires out of engine bay, want to put a fuse box inside the cab, and yes pics would be awesome

those yotas have all that wiring that runs across the core support in front for the headlights, all the way around the whole truck, and i shouldnt need most of that, i just dont want to over do it and have the engine not run right anymore and be stuck with a major headache

hard to tell you what to cut and not cut without having the truck. you dont need much to make the truck run though lol

start the truck and start cutting wires if it dies hook it back up lol.

I have done that before and it ends up being a huge pain in the ass. There is a difference in a motor that runs or a motor that fires correctly and runs awesome. That motor will run with three wires. What you need to do Is get a wiring diagram from that year motor/computer and start from there. All the stock light, dash wiring harness can be almost completly removed.

i know i wouldn't do it ether haha. we have to do the same thing for a wiring harness for our 5.3

is there any free places i can get a diagram?

found all of the pin outs good to go there, my last question is when i did my swap i used the engine and trans from the same vehicle, but the only 2wd auto harness i could find was from a t100 everything is identical to the tacoma or 4runner except for the driverside trans sensor that controls shifting, the t100 sensor will not work on the tacoma trans, but im wondering since its a 2 wire sensor if i could just change the connector end from a tacoma since the sensor, engine, ecm, trans are all from the same vehicle

Toyota Tacoma/ 4Runner/ Tundra/ FJ Cruiser Factory Service Manual Page

factory service manuals, find your year motor

thanks thats what i found earlier also some had compiled all the pin outs so good to go almost done cutting wires, only question left was the one on the trans sensor. i think i could just cut and splice on the correct connector for the sensor and be good to go

get your self an SDS system, thats what i did i haven't installed yet still prepping the 3.4 to swap into my 89 pick up

yeah that would be ideal but sds right now is a little out of my price range

3 wires is all it takes to make the engine run.

1 power wire to alternator to turn it on with ign.

Snip all the wires going to emission components.

Factory service manual is your friend.

Sounds like the plan to me !

Originally Posted by shane1617

start the truck and start cutting wires if it dies hook it back up lol.

sounds like the plan to me !

Originally Posted by toyotatt

i have a 94 pickup with a 3.4 swap everything works and runs fine, but i am going to be stripping it down, caging it, and making it an offroad only prerunner and eventually race, I would like to minimize the wiring for the engine and everything else to keep it simple and easy to work on and troubleshoot, my question is which wiring is needed to keep the engine running correctly and which can i eliminate? i know there is alot of race trucks and prerunners that have 3.4s in them or used too, and am looking for some help to save me a tone of time with the wiring diagrams. a contact or anything would be nice because im out in colorado and very few have any idea what im talking about. any insight would be appreciated, ive searched everywhere with no results

You might want to figure out what class to race before you do too many mods. Most pre runners are just that, they don't fit into any class but open.

PM you.