Emiliano

i really need some info on interchanging a 1993 sc400 1uzfe with a 1995 sc400 1uzfe. i did some searching but didnt find what i was looking for. i would like to know what kind of problems would i be prepared for when starting the swap. can i use the same 93 ecu on the 95 motor? any info would help me. also what electrical problems would i expect? are transmissions the same?

scENFORCER

95 is OBD2 and 93 is OBD1, so yes its not a simple swap, you'll have a lot of electrical issues. OBD2 will have a lot more sensors that a OBD1 doesnt. Not sure exactly what other issues, but I know its not worth it.

Just find a 93 1uz, they're not hard to find, and save yourself a headache.

..if you need a new engine, consider other options, 1JZ, 2JZ, or if your pockets are really deep than maybe even an LS1. Almost every other member of this forum has a 1JZ or 2JZ swap, so there's endless info on how to do it.

Ali SC3

iTrader: (10)

you can only use the 95 motor is you use the 93 ecu and the 93 harness on the 95 motor, and whatever sensors are different you will have to swap over from your 93 so don't junk it. It will not work with the 93 ecu and 95 harness. also 95+ are inteference motors if you were planning on turbocharging it those are less desirable. if just a replacement they are fine.

also whats wrong with the 93, could be something simple like the coilpack that is very common to go out. seeing as you are a new member just wanted to let you know it may be worth fixing the one you have, sometimes its a simple fix, these motors are hard to destroy especially the 92-94 ones.

xtra

Maybe I can chime in on this one.
I swapped out the 1UZFE from my 1997 with a JDM celcior 1uzfe. All I can says is that i will never do this again in my life ever.
I pretty much had to strip the block bare including the oil sump and oil pan assembly.
Ended up swapping out every imaginable thing over to the new engine to make it compatible. Things should be easier for you since it’s from a 95 to a 93 ,swap out everything from the old engine to the new one to avoid issues, intake, injector, harness, sensor, knock, everything needs to be swapped over.

fourstars

the celcior is similar to the lexus ls400, and is a lot different in oil sump, pan, oil filter bracket, exhaust manifold, and power steering pump.. if you got a SC400 then you didnt have to do all that. the sc400 had an oil pan and sump in the rear, as the celcior had it in the front, celcior oil filter sticks outs 2-3 inches more, exhaust manifolds pops out about 2 inches more and power steering pump has the reservoir on top of it. wiring harness is completly different but has the same color coding, the ecu plugs on the celcior has 4 plugs, 3 for the engine and 1 is from the body harness, the sc400 has 3 plugs, 40/40/40 pins. those are the differences of the two. other than that same a littl differents in plugs for some sensors but you can always de-pin those.

fourstars

if you take off the harness from that 95 sc400 and use your 93 harness, you should not run into any problems. at most you'll run into sensors not fitting your 93 sc400 wire plugs. for instance, the VSV. the 95 sc400 i think has a different wire plug, but has same wire color code. all you'll need to do is de-pin the 95 harness plug and use that wire plug. so there is no cutting involve. there, u can use your 93 ecu. the transmission are the same so you dont have to worry about that. the celsior tranny has a longer gear ratios. but ulitmately the same..

Emiliano

Thanks for all your info i already have the 95 engine so I have no choice but to drop it in. Once I start the swap I'll be asking a few more questions as I go threw the process. As you may all know I'm new to this site so please bare with me. All I'm looking forward is for the car to run. I'll be doing body work to it and a full paint job myself. That's what I'm good at not under the hood. Once again thanks for the info.

ScGhost19

The 95 is definitely OBD1 I have both the 93 and 95 1uz

t2d2

iTrader: (8)

This point of confusion keeps popping up due to the LS400 going OBDII a year earlier in '95.

JasGS350

iTrader: (7)

100% correct, and its a non-interference engine. I have a 95 SC400 with a supercharger and had to turn the passenger camshaft to get the timing marks back in line when my timing belt skipped. I did a full rotation with the belt off, which you can't do with a interference engine and not mess it up. My 2 cents.

Ali SC3

iTrader: (10)

well technically speaking you could rotate a cam all the way with an interference engine if the engine isn't stopped at TDC, its only when one of the pistons is fully up will they hit each other. thats why there is a "T" mark a little after TDC on the 2uz for timing belt changes, when you set the crank to the "T" all the pistons are below deck height allowing extra clearance. thats why some engines you can have a belt let go and it miraculously survive although being inteference, but majority of the time it doesn't.

likely it isn't inteference till obd2 though and you are right, but still those 95's are sort of a grey area due to the ls400.

SC400slide

iTrader: (11)

One more confirmation, that the 95 and older are OBD1 and 96 and up are OBDII.

Kris9884

iTrader: (7)

In other words, this will be a plug and play affair man. If you really don't know grab a buddy, take a LOT of pictures of all kinds of angles BEFORE you start unhooking everything. Then on the re-install you have things to reference if anything goes wrong. Besides the ignition plugs, everything else is pretty hard to mess up, they all go to a specific female plug and only fit in a certain way.

If you don't mind me asking, what was wrong with your original motor set?