Hey all,

I have a complete LH2.4 donor car, and am wondering what the general steps would be to swap LH2.4 into an existing LH2.2 car? Do I have to swap all of the loom wiring? Cabin wiring? Is it even worth doing?

Thanks!

It is a nicer EMS for sure, but if you are just running a stock NA 240 I don't think it's worth the effort. If you are wanting a base from which to modify the engine, either +T or a more wild NA setup, at that point I'd say it's worth it.

You don't need to swap the cabin harnesses, the engine harness is separate from the other harnesses (one thing I love about 240s is their modularity).

So you'd have to separate the transmission to swap the flywheel or flex plate for the toothed 2.4 version and mount the crank position sensor

Then you would swap the whole engine wiring harness and the ECU (fuel computer). I forget if 2.2 240s already have an EZK (ignition computer), if they do then you can leave that alone.

You also need to swap the engine coolant temp sensor and the AMM.

The distributors are different, but you can leave the LH-2.2 distributor as-is, it just won't have anything plugged into it from the harness anymore.

My only advice if you pull the harness is do not cut any wires, pull the whole engine harness intact. This includes the cable bundle that runs inside the cabin, along the firewall from the passenger side to where the ECU mounts to the right of the driver's feet.

The interior trim panels and brackets that cover the ECU are handy to have. The EZK mounts to a bracket on the cabin side of the firewall near where the loom passes into the cabin from the engine bay.

What year is your donor LH2.4 car? The reason I ask is in 1993 (and possibly 1992) they made some major changes to the harness and how it routes into the cabin. The grey connectors in the engine bay were deleted and all connections were made inside the cabin below the glove box area. It might be easier if the donor car is 1991 or earlier. FWIW I converted a 79 245GL from K-jet to a 1993 donor car LH2.4, but I swapped the complete body harness (basically stripped my car and the donor car down to bare shell and built back up as if the factory were assembling it). That was a lot of work. I agree with others, if your LH2.2 is running fine and you have no plans for turbo or whatever, just leave it as-is. I even did a supercharger conversion on an 88 LH2.2 car and with some tricks (rising rate fuel pressure regulator) I was able to make it run fine. TBH I've had better reliability out of the LH2.2 cars than LH2.4. LH2.4 seems to come with some odd glitches.

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