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I've searched, but I've only found that the '91 has the oil cooler (w/a different water pump).

From my collection of '91 EJ22T parts I bought from dwreck30 I've seen:
- Different IM harness plugs = matches the '90-91 NA plugs by the battery.
- Idle adjustment screw on the TB.

What else is different?


I'm putting the '91 back together and wondering if it's got any advantages over the '93 I swapped in. 160K on the '91; 140K on the '93.

Thanks

You just about covered it. Those are the only things I have discovered also. For all reasonable purposes they are identicle.