ATX --> MTX Conversion Information
- Thread starter rubydist
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
I plan on using the MTX computer. How did you know which wires to switch? I have the Chilton's manual, and on pages 6-142 and 6-143 it shows the wiring diagram for each computer. Is it a safe bet to pull out ALL the wires from the connector, and re-insert them into the positions they're supposed to be on the MTX computer? How are the positions numbered on the connector? What happens to LT GRN/PPL? (I don't see it on the MTX diagram anywhere.) Thanks again. -Joe
You actually need the right connector, or will need to modify the keys on the connector - even though they are the same size and number of pins, they are keyed differently, so the mtx and atx harnesses don't physically plug together - I suppose you could grind off the tab that's in the wrong place.
I don't know if the Chilton's diagrams are correct or not.
I don't know if the Chilton's diagrams are correct or not.
gmail
Well-Known Member
Yup it works with the D4U1 (atx) but on my part with the poor Tweecer support with the ATX ECU I decided to put MTX wirerings and ECU. You will need both EVTM manuals (if both harnesses are diff years) and match all the wires , but most of them are the same colors (94 atx with 92 mtx) Except the DRL (canada) this was more of a pain. C100 , C101 connectors are the ones you need to look out for. This is the result BEFORE re-looming it.
i cant believe that maf dont give you problems...
usually when you clock the maf differently it makes it upset.
personally i thought the atx computer made the car feel so much better then a 3.2 running x2j
also for post # 7
i never had that problem at all... kinda makes me wonder if you got something else going on.
i was actually suprised how well the car performed also considering i just threw the egr crap away.
the4biddendonut
Hurry up meow.
I'm wanting to do this swap with a 93 atx and a 91 mtx. Would the swap be a lot easier if I were to use a 93 mtx engine harness with an mtx computer? Or are there going to be problems that would make it not worth it?
Shoaz
Studly dood
The easiest way is to leave the existing engine harness and computer in place, IMHO.
If you do want to swap the engine harness and computer you also need to swap oxygen sensors (with an MTX), and take care of a few other things (e.g., clutch interlock switch, etc.). It won't make much difference what year of harness you use as long as it's GenII.
Its not the engine harness that will be the challenge, it is the front body wiring harness.
I would recommend keeping the 93 harnesses and just doing the few mods that I described above - your plan is virtually like mine where I put a 92 engine into a 95.
I would recommend keeping the 93 harnesses and just doing the few mods that I described above - your plan is virtually like mine where I put a 92 engine into a 95.
the4biddendonut
Hurry up meow.
That makes sense, thanks a lot.
I don't want CELs and I still want to be able to pull codes if needed. Have you been able to work that out?
I don't want CELs and I still want to be able to pull codes if needed. Have you been able to work that out?
Yes, I removed the cel from the dash, so I don't have to stare at it. When you want to pull codes, you do the shorting loop like normal and then you put a 12V light on the "test out" pin on the large connector (its the one down and one to the left of the one that you short) and connect the other light lead to the + side of the battery. The test light flashes just like the one on the dash, so you don't need the dash one. The only downside is that you have to pull the codes to know if the cel should be illuminated on the dash....
the4biddendonut
Hurry up meow.
I'm sure I'll resurrect this thread from the dead if I ever get the project off the ground. Thanks for the info.
The current link to Phoenix' conversion article is:
http://www.shospeed.com/pics/ATXtoMTX.pdf
http://www.shospeed.com/pics/ATXtoMTX.pdf
Sorry for bumping this thread but I have considered a manual swap for my 93 ATX and have found a complete 92 donor car with 45k miles. Since the donor car is complete and the miles are low i would plan on just swapping the entire subframe,engine,trans as one and of course changing the ac lines etc. would doing that make the swap a little easier?
lowc
aka vapah lock
that is all intailed in the swap as far as the motor i would use the 3.2
Shoaz
Studly dood
Some things get easier that way. You'll have to do some rewiring to match the engine harness to the dash harness, as those connections differ a bit between the ATX and MTX, but that's possible and has been done before.
Depending on how much work you want to do, consider swapping blocks while you have everything out, i.e., take the 3.2 block and everything else from the 3.0, put it all together with the MTX on the MTX subframe, stick it in the chassis you want to keep. With low mileage like that, though, I don't think anyone would blame you for keeping the 3.0 intact.
lowc
aka vapah lock
ive done the rewirering thing and it was a pain in the ass its much easier to use the 3.2 harness and "trick" the ecm
Similar threads
