Author Topic: 3.4L Swap (Auto to Manual Trans) (Read 24902 times)

THK Matt · « **on:** Feb 21, 2009, 07:02:00 PM »

Hey guys, posting for a buddy.

904_Runner, found a 99 Tacoma with a 3.4L w/ Auto trans. He has a 1990 4Runner 3.0L w/ R150F

Him and I are trying to find how to convert his harness to accept his R150F and if the 99 Taco ECU will respond to the manual.

We are finding info on what clutch components he will need, but no info on how to convert an auto harness to manual.

Any help will be greatly appreciated! $Beer Chug\'n$
Thanks, ThatHOKid

Dingman. · « **Reply #1 on:** Feb 21, 2009, 07:03:04 PM »

Hey thanks as well, didn't know you were making a thread about it!

THK Matt · « **Reply #2 on:** Feb 21, 2009, 07:06:09 PM »

Lol, no problem.... I too am curious.

Marlin · « **Reply #3 on:** Feb 21, 2009, 10:05:20 PM »

You have major problems. Since the computer shifts the auto, it will send trans codes. You must change to a manual computer.

It is possible to install in line resistors that have the same impedance as the solenoids in the auto trans but I would advise changing the computer.

Next issue is that the wiring harness has difference pin locations on the manual trans plugs at the computer.
You must get a factory service wiring manual before you do this job.

Marlin

THK Matt · « **Reply #4 on:** Feb 21, 2009, 10:07:50 PM »

That's what I was thinking as well.

what wires are needed to be crossed, spliced? and to what...

Marlin · « **Reply #5 on:** Feb 21, 2009, 10:16:05 PM »

At the computer if there are 60 wires in the 4 plugs, Toyota will require you to rearange 58 of them to match the manual trans
This cannot be done without the factory service manual.

The 99 FSM gives you great color coded picts. The reat is up to you.

Dingman. · « **Reply #6 on:** Feb 21, 2009, 10:17:06 PM »

I thought i heard you could trick the computer into thinking its always in neutral and then it would work..

Is that a possibility.

I found a 3.4 that the guy wants 800 for. so if i could make it work that would be good.

THK Matt · « **Reply #7 on:** Feb 21, 2009, 10:18:47 PM »

wow..... besides the rearrangment..

like the "Park/Neutral" for example... is there any wires... that can be jumped or cut out..
a electrical schematics would come in handy for sure.

Going with a Manual from the start, would be the way to go.

Marlin · « **Reply #8 on:** Feb 21, 2009, 10:24:08 PM »

I have heard of installing resistors in place of the 3 solenoids that are in the trans.
I have a FSM at my shop that would give the proper ohms resistance of a working solenoid.
Next go to Radio Shack and install the resistor in line with the auto wiring and the computer would be fooled.
I have never done this, but it does work.

Dingman. · « **Reply #9 on:** Feb 21, 2009, 10:25:03 PM »

Yea but i think its a kill of a deal to find that one. IF i can make it work then i will.
I haven't been able to find one out of a mt.

There was one at the local pick and pull that they wanted 1,500 for and it had like 30,000 more miles and it was way over full of oil. Don't want it.

Dingman. · « **Reply #10 on:** Feb 21, 2009, 10:25:54 PM »

Quote from: Marlin on Feb 21, 2009, 10:24:08 PM

I have heard of installing resistors in place of the 3 solenoids that are in the trans.
I have a FSM at my shop that would give the proper ohms resistance of a working solenoid.
Next go to Radio Shack and install the resistor in line with the auto wiring and the computer would be fooled.
I have never done this, but it does work.

Thank you. I will have to go buy the wiring schematics. I have the toyota FSM's for my 3.0 but not for the 3.4 ill have to get one if i get the motor.

Marlin · « **Reply #11 on:** Feb 21, 2009, 10:26:31 PM »

You must simply connect the starter wires that go to the netural saftey switch. They are the two largest ones.
The back up light wires are also there.

THK Matt · « **Reply #12 on:** Feb 21, 2009, 10:28:16 PM »

sounds like more work then you should have to do.

I'd find a manual truck and trade/swap harness's and ecu's, 904_Runner.

My

Thanks for the helpful information Marlin, $Beer Chug\'n$

Dingman. · « **Reply #13 on:** Feb 21, 2009, 10:33:36 PM »

Yes i appreciate it a lot!

Im still going to do more research on it. Im sure someone hsa done it already..

Its at a good price and semi local to me, im thinking about still doing it though.
Are the brains simply interchangeable? If i got a MT ECU after would that plug into the auto harness?

Dingman. · « **Reply #14 on:** Feb 23, 2009, 12:21:07 PM »

Hey someone posted this up on another site.

Quote

The wiring harnesses won't match. Auto and manuals use different plugs, so you'd have to get the wiring harness to go with the manual ECU.

Really? So the auto harness with the manual trans ecu that is in my truck right now and has been my daily driver for over a year with no codes wont work?? Don't tell my truck that, it might die

I hate it when people say stuff like this, that have absolutely zero experience with this type of stuff. I am not trying to pick on you rob, your a good guy, but that kind of stuff just gets under my skin and many other people on this and other boards have said the same thing.

Now, dont think that all auto harness will plug into manual ecu's, not all of them will. Most will, they had the different plugs mainly in the earlier years between auto and manual trans. That harness out of a 99 taco should be ok, but you need to get the p/n's off of the harness and the ecu and take them to your local yota dealer to make certain of what year they are. Then bury your head into the wiring diagrams for both trucks (the ecu and harness) and make sure every pin is in the same location between the two and that the plugs are the same.

Either way get the manual ecu, if that does not work with your harness, they go for decent money on ebay for guys like me piecing together a 5vz swap instead of buying another truck just for the motor. To answer your question it would be much better if you got the manual ecu to work on your truck. I was thinking like you on making an auto ecu work, but I am not sure if the ecu would throw codes when it starts seeing such a great load on the motor when it thinks the trans is in park (or neutral) That and I wasnt sure if it has a different timing map for the ignition when its in park vs. drive.

From the diagram that I am looking at, 99 taco ecu plugs are the same from manual trans to auto trans. Dont quote me on this, do some research and make sure for yourself and make sure of the year on both parts so that you know for sure what you are working with.

THK Matt · « **Reply #15 on:** Feb 23, 2009, 07:24:00 PM »

awesome!

sounds to me it'd be easier to start with a manual harness and ECU... hell buy that truck dude just for the motor and what not and buy a harness and ECU separate.

TIMS89CRAWLER · « **Reply #16 on:** Feb 23, 2009, 07:53:01 PM »

you can put a manual ECU rite on to the auto harness.... I just did a 3.4 swap in a 1993 x-cab truck with the manual trans... the motor was from a 1999 4runner with a manual... we simply put the manual ECU from a 99 taco manual in with the 3.0l 5speed (R150F) and it runs and drives like a champ....

Dingman. · « **Reply #17 on:** Feb 23, 2009, 10:33:11 PM »

I appreciate it very much....

Ive heard that from multiple people as well...
When i start my swap would it be okay if i ask you for help if i get stuck...

Thanks
-Mike

THK Matt · « **Reply #18 on:** Feb 23, 2009, 10:41:30 PM »

no you can't ask questions, you have to do it first then ask questions afterwards.... DUH!

TIMS89CRAWLER · « **Reply #19 on:** Feb 23, 2009, 10:53:19 PM »

Quote from: 904_runner on Feb 23, 2009, 10:33:11 PM

I appreciate it very much....

Ive heard that from multiple people as well...
When i start my swap would it be okay if i ask you for help if i get stuck...

Thanks
-Mike

for sure man anytime.... I did all the wiring with plugs I cut off a tacoma in a wrecking yard and just wired all the stuff rite into the 93 truck harness so it is all factory stuff and all the splices are in 1 spot under the passenger kick panel its a really clean and easy swap.... feel free to ask me questions anytime man!

Dingman. · « **Reply #20 on:** Feb 24, 2009, 09:51:16 PM »

Thank you...

Im hoping to pick up this motor this weekend. MY 3.0 is acting up.

TIMS89CRAWLER · « **Reply #21 on:** Feb 24, 2009, 11:26:55 PM »

Quote from: 904_runner on Feb 24, 2009, 09:51:16 PM

Thank you...

Im hoping to pick up this motor this weekend. MY 3.0 is acting up.

thats typical... theyre pretty much junk in my book

Dingman. · « **Reply #22 on:** Feb 25, 2009, 07:46:21 AM »

I don't think its just your book!

Everybody hates those motors.
What can i say, mine has 258,000 miles on it, never been opened up.

TIMS89CRAWLER · « **Reply #23 on:** Feb 25, 2009, 03:57:03 PM »

hey thats pretty damn good!!! sounds like yours has been a good one!

Dingman. · « **Reply #24 on:** Feb 25, 2009, 05:12:29 PM »

Wasn't horrible, but it is time to change it.

Been running like garbage the last few days.
Pulled the plugs and did a comp test. CYL 1 was fouled,
And they were all around 100psi, except for cyl 2 and 6 where at 60ish psi.

Less than 8,000 miles ago, under 6 months, i did a comp test and all cylinders where at 150 psi.

TIMS89CRAWLER · « **Reply #25 on:** Feb 25, 2009, 06:52:39 PM »

shitty man well good timing for the 3.sleeper I guess!!! they are f-ing fast motors man you will love the power!

Dingman. · « **Reply #26 on:** Feb 25, 2009, 07:10:55 PM »

Yup...

We have a 99 4runner at the house and it hauls compared to mine. I cannot wait.

TIMS89CRAWLER · « **Reply #27 on:** Feb 26, 2009, 09:43:38 AM »

Quote from: 904_runner on Feb 25, 2009, 07:10:55 PM

Yup...

We have a 99 4runner at the house and it hauls compared to mine. I cannot wait.

ya now just think about that motor in a truck that weighs prolly 1000lbs less than that runner!!! its badass!

THK Matt · « **Reply #28 on:** Feb 26, 2009, 11:40:36 AM »

Quote from: TIMS89CRAWLER on Feb 26, 2009, 09:43:38 AM

ya now just think about that motor in a truck that weighs prolly 1000lbs less than that runner!!! its badass!

and not auto!

THK Matt · « **Reply #29 on:** Mar 01, 2009, 06:11:35 PM »

Hey Tim, We need the wiring diagram from you for this thing! and where the hoses and

go!

(keep in mind has to be smogged)
so only thing different from you is he'll need the cats and 02 sensors.

Lil Mikey got his 3.4L

$Beer Chug\'n$

THK Matt [OP]

THK Matt [OP]

THK Matt [OP]

THK Matt [OP]

THK Matt [OP]

THK Matt [OP]

THK Matt [OP]

THK Matt [OP]

Related Topics