87toyy

My buddy has a couple v6 toyota 4x4 pickups. The good one is 91 ext cab. He took the motor out of a regular cab not sure on the year. Both v6 standards. Got everything bolted up, and went to hook the computer up and the wiring was different. Hes gonna sell them to me really cheap. He says all i have to do is change the wiring harness. Do some of the v6's mayby a different year have different wiring?

myyota

Most of the time the sensors will be different from year to year, so you need to swap the sensors from the old motor onto the new motor.

WesinTX

I think he means the wiring plugs at the ECM are different. They very well could be car makers do some crazy s!&t.

sb5walker

There were minor changes for most years but the main connector change I think was 92 when production of most trucks switched from Japan to the U.S. It certainly would be better to use the year-correct sensors for the vehicle - distrib, throttle body, vafm, all the various sensors & doo-dads on the cooling outlet in the top back, etc. Reason being is that you have to match the right sensors to the ecu - it ain't just a matter of connectors. There were changes to some of the spec ranges of some of the sensors.

It will be best to use the sensors that came with the vehicle, rather than with the motor.

87toyy

Ok thanks for the info i'll have to make sure he still has the old motor to get all the sensors of it. I always had 22re's and never had any problems with that stuff when switching motors.

sb5walker

Oh and don't forget the oil pressure sender - very important to use the right type for the cluster. Good luck.

TNRabbit

might be cheaper to switch the ecu....

87toyy

Thats another thing i was wondering. Would i be able to ttake the compute rout of the other truck that the motor came from? Or would i still have to switch the sensors and stuff?

sb5walker

Match the ecu, wiring harness and sensors to each other. Because an ecu must match many other things on a vehicle, like trans, 4 or 2 WD, whether a CA truck, type of vehicle speed sensor, etc, by far the easiest approach when swapping in a newer style motor in an older truck (or vice-versa) is to swap the distrib, throttle body & cooling outlet (with sensors) from the old truck/motor to the new motor. All years of the 3VZE are the same mechanically except for timing idler arrangement, which doesn't matter: you can use whatever a motor comes with.

Oh, and another gotcha: the knock sensors are different, and have a different connector. Forgot about that one. That's a pain to switch. Best to replace the pigtail with one from the dealer while you're in there.

87toyy

So seems like it might turn into quite the job switching everything

sb5walker

Not too bad, if you have the old distrib, tbody & sensors from the old engine. Will just need some gaskets, distrib o-ring, the knock sensor pigtail as mentioned. Since you have to get the plenum & intake manifold off to get at the knock sensor, might as well use those from the old engine too. Won't even have to remove the tbody from the plenum.

You want a big job, try replacing the wiring harness. That would be much more work.

Depending on how good a job you want to do, you might take the opportunity to adjust the valves. Bit of a pain in the butt, but the exhaust valves have a tendency to tighten up and need to be adjusted every 70-80k miles or so. Otherwise they can stop fully closing and burn.

And you might consider replacing the injector o-rings too. Get new crush gaskets for the fuel line/rail connections.

REDYOTA

I had to swap all my stuff over when i swapped my 95 3.0 for an 88 3.0 i think, distributor, ac bracket, injector plugs, knock sensor, exhaust manifold (4runner to pick up) etc....

You can swap the newer stuff to the older motor but If I remember correctly you cant put the old distributor in a newer motor, i believe its too long.

yiafly

I put an 88' 3vze in my 91' truck and yes the sensors were different, the injectors were also different. I put the plenum and sensors and fuel injectors from the 91' onto the 88' motor and kept the 91' wiring harness on the truck. The motor mounts were different also so I had to use the 88' mounts just because the block mounting holes were different.

87toyy

He did say he had to put new motor mounts in it, so they musy have been different too. I went out and looked at it last night, and the wiring looks pretty hacked up. I would say they cut the wiring for everything when they took the old motor out instead of unhooking it. I'll think i'll stay away from it rather then trying to deal with some one elses mess.

yiafly

What about the truck the good motor originally came out of? If you really want the 91' you could always get a wiring harness from a junk yard. They also might have some adapters for that swap at painless wiring.

davesluggo

Do you know if the injectors from a 94 4runner will work with a 92 ECU?

92 flatbed

parts book shows same part number for both of those years...

yiafly

older injectors like that are a solenoid. They get ground and power to actuate, therefore if the connectors fit it should be good. On my swap i just ordered DENSO connectors and replaced them on my wiring harness.

Is the 94 still a 3.0L or is it a 3.4L?

yiafly

Nevermind, I just saw you have a 3VZE.

Jeremy11

I know this is kind of an old thread, BUT I just swapped a 1994 3VZE into my 1990 4Runner. Kept the 1990 ECU and harness. The cooling sensors are a bit mixed up since whoever worked on the old motor pigtailed them all and there were no clips. So i had to guess at it with the colors. Now I have code 22, which is the water temp sensor fault (my temp gauge is backwards... starts at the hot side.) I was wondering if anyone had a diagram or could help me out with the cooling sensors from the 90 harness to the 94 motor. Also, the motor wont fully crank over because I have liquid fuel leaking from my exhaust manifold... Searching for a fix for that also. Thanks in Advance!