[SpeedyW]

Hello,
I am new here so HI TO ALL!! I have found searching this forum to be of good help in times past on all things TOYOTA and decided to join. I have a great 89 body with blown motor. I bought a 91 dirt cheap wrecked in the rear for the engine. I found out that it isn't exactly a true bolt in swap. I thought I could swap intakes for the carb one and away I go. So I have decided to swap the whole engine and convert the 89 to efi using parts from the 91. I know this has been talked about before but it seems that no further info was given on how it went. What exactly do I have to do to make it work on the wiring side? My idea is to just label every single plug,hose,tube and cable as I take it off the 91 and reinstall it in the 89. Just how much of the engine/ecu harness is tied together with the rest of the cars harness? I don't want to have to do much butchering if possible here. I am not good at wiring but have enough sense to pay attention and take pictures and notes of what I am doing for reference. Did a d16 to b18 swap in a civic so I know a little about what I have to do but it is hard to apply honda logic to a TOYOTA right?
Any help will be great and very appreciated...thanx

[fishexpo101]

Hello and Welcome to the forum.

Converting from carb to EFI is not 100% straight forward. Mechanically, not dissimilar to previous swaps that you've done - the wiring is always going to be the tough part. Since you have both the cars there - it makes the swap go a little more smoothly. Can't tell you the exact number of wires, but there are some that will have to be spliced into or out of the main body harness.

There are bigger stuff to work out, other than wiring, one is the fuel system - the other is electrical requirements. Carbs generally need 6-12PSI and their good to go - EFI generally runs anywhere from 30-50PSI or more. So the fuel pump will have to be upgraded at the very least. Ignition/electricals will also have to be swapped over - the power demands for the EFI system are significantly higher than a carbureted one. Off the top of my head - stuff that will probably have to be swapped off the donor car:

- EFI engine + brackets (assuming they are in good shape)
- accessories (alternator, etc. off the EFI engine)
- intake and exhaust and associated sensors
- fuel pump, filter, pressure regulator, and lines (hard and soft - may just need to replace them with something else, need to stand up to higher pressures).
- gasoline tank (has extra piping running to it), evap system, vacuum hoses, etc. (EFI has different emissions and EVAP requirements - routing may be different, need a FSM to find out for sure).
- ECM and as much of the wiring from the donor car
- MAP sensor for EFI engine
- air temp sensor, if there is one
- distributor assembly (they might be different, not 100% sure) and associated ignition system components
- relays and VSV nodes
- battery terminals, fusible link, all the fuse boxes
- gauges (you'll have additional warning lamps with the EFI system)

There is probably more information out there - but there are quite a few Corollas that were swapped from a carbureted to EFI variants. Might be some more information on club4age website - will not be an exact swap, but will give you an idea of what might be involved.

[SpeedyW]

Thanx...Will start on it soon. I just have to take my time and pay close attention to what I do. Will let you know how it goes after I start out.

[SpeedyW]

Trying to find a decent online wiring diagram. Anyone got an idea? I'm on a shared pc so I can't download a file,but can print it out.

[fishexpo101]

I haven't run across a really detailed one online, atleast sites that are still online. For this - might be cheaper/easier in the end to pick up a Chilton's or Haynes - just for the torque values and wiring diagram. A factory service manual would be better - but may be hard to come by, especially in your generation of Corolla.

[Bitter]

a company called phoenix tuning should be able to just MAKE the correct wiring harness so all you need to do is plug things in on the engine and hook the computer up inside the car.

[SpeedyW]

I have almost no money but thanx for the point in the right direction. I wish I could afford a megasquirt kit but work is shaky and christmas is near for my son. I got the engine harness,ecu and headlight/fan harness out. Dash is out and all connectors labeled. Some of the wiring is melted and cut up under the dash. I am going to try to use some of the 89 harness by doing a "pin out" type deal, replacing the burnt 91 circuits with the good 89 ones. Or just butchering it up all to heck and back and then just buying the megasquirt kit anyway. I am hoping that the circuits that are burnt will be the same as the 89 so I can unplug the "mini harness" from the 91 fuse block in the kick panel and plug in the 89 one. It will really be trial and error here, lots of multimeter bonding time and patience I think. Will let you all know how it goes. I am a nuts and bolts guy,I know crap for wiring so I will be asking alot of questions more than likely. Nobody thinks I can make it work around the house,I will show them when I drive it....