I have been looking for a GENI or GENII Montero do possibly do a 4D56 TD engine swap into.
I know there are many ECU revs out there, but is are any of the ECU's on 3.0's tied into more then engine and trans management?
If I swap in a purely mech 4D56 with a manual trans, then should the ECU sit there with connections dummy'd or be removed?
What connections are necessary to maintain?

I am looking at a '94 Montero 3.0, engine removed, ECU sold off already. Is the ECU necessary here? Are the guages and idiot lights wired through the ECU, or direct? Does the ignition switch go through ECU?

Just getting started, so thanks for any help and input!

The '94 Gen II did not have a computer controlled tranny (same as the Gen I's), so this would be a good candidate. The SR's and '95 on LS's (24 valve 3.0's) had a computer controlled tranny.

I'll be interested in seeing how this goes, since I have a '94 LS in need of head gaskets. I've been thinking about selling, but might be interesting with the 4D56. Are you going with the 4D56 or a 4D55? If the 4D56, where are you getting it from?

Have you looked in to how the diesel swap affects emissions testing? Or do you have to worry about that? I know I do here in the SLC valley.

Along the comments of Lee, what do you have to do with respect to torque converter stall speed for this swap? Can you keep the stock AW372 and TC? Theoretically a diesel will have totally different torque delivery characteristics than our 3.0.
My '93 SR runs great for 132k, but a diesel conversion would be great down the road, since I'm always looking for some new, sadistic car project to torture myself with.

If I had the choice, I'd be doing the 4M40 2.8l diesel. If you're bringing one in anyway, why not look at the bigger one, and swap into a formerly 3.5 equipped? Just a thought. As it is, I'm limited to 91 and older, so it'll be 4D56 for me too. But if I had the choice...

Some of the "how to's" are posted on the thread called
'Diesel conversion?'

I am moving slow on this right now trying to find the right canidate vehicle, prepping the wife (she'll never like this idea), and trickling the money in.

As far as the diesel donor: 4D55's are here and there in the in the US with high miles. 4D56's JDM's can be had for $1600-1800 plus about $200 freight, for one with 75-100k on the clock. At this price they come in with trans and transfer. One source is Jarco ( http://www.jarcoinc.com/ ). I have another source out of BC Ca. that was $300 less, but need to look into the import costs and paperwork from BC to USA.

I really want to find a nice GenI 5spd to work this on. JDM's are more prevalent with sticks.
In Mich so far, I do not need to worry about emissions. If I ever did, that is why a nice '90 GenI would be nice, might be grandfathered on emissions.

You're right the 4M40 is a much better motor. Not sure I want to mess that much with an ECU. The ones I say for sale were $2800++ in costs also. Once in the states, who can plug into it for tuning if necessary?

Thanks for all your input!

As far as the ECU missing on this '94. Do I even need one plugged in for this swap?
Does it control anything I'll need??

Are the guage inputs direct 12v to the guages, or through the ECU as inputs?

thx

Does the 4D56 engine have a cast aluminum cylinder head like the 4D55? Did they upgrade the strength of the head on the 4D56? Since the 94 Montero had the 3.0 V6 in it from the factory I bet it would be a little more work to drop in the 4 cylinder diesel. sweli, I think if you go and look for a decent 1st generation Montero/Raider with a 4 cylinder engine, your conversion would be easier. That's pretty much a given and I'm sure it has been discussed more than one time on this board. The first generation 2 door Montero/Raider is the most attractive truck to use in my opinion. Is a SWB, lighter, and just looks cool as an off road 4x4. If you could pick up a 4D56 that would be sweet, as you'd have the newer technology not to mention more power and torque. Hope your project does become diesel powered! Right now I'm working on dropping in an Isuzu diesel engine into a factory 86 Trooper turbo diesel with no engine or trans. I'm looking forward to that day I get to hit some trails with other guys who are driving small diesel powered SUVs or trucks.

Salvy

A quick look at the wiring diagram doesn't indicate that you couldn't eliminate the ECU. Most everything connected to the ECU has to do with the engine management. There is a tie in to the AC system, but I believe that just gives a signal to bump up the idle RPM. As far as the gauges are concerned, they're all stand alone 12V.