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Is the wiring harness under the hood basically all one peice? Does it only go into the passenger compartment via the large connector next to the brake booster?
I may be switching to an aftermarket sequential injection mass air system which will probably require removing a good deal of the original wiring. However, I'd like to be able to put another stock harness in if I need to (aka something goes REALLY wrong).
On an '89, the ECM harness feeds through behind the engine, closer to the Evaporator or passenger side of the vehicle. If your ECM on the 90 is in the passenger compartment, I believe it would be similar. If the ECM is in the engine compartment, you should be able to find it rather easily. The harness at the battery is headlights, gauges, fan and a/c. Painless Wiring makes all sorts of harnesses. So does Street & Performance and they can provide the correct ECM http://www.hotrodlane.cc/