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Actually, 1987 was a trasition year for Volvo and their harnesses. Some are good, and some are faulty in 1987.
If you bought a rebuilt Bosch AMM your fine, its the other name aftermarket rebuilt meters that can give you problems.
If the thermostatic air cleaner is stuck inside your airbox to the hot position, (if its getting hot air all the time,) can fry your AMM rather quickly. So you should remove your air box and check. You can put a 16 penny nail trimmed to the right length in place of the moving pintle so you only get cold air all the time. This is the real cause of Bosch AMM failures on 240's.
It is possible that you toasted the second air meter.
Even though your harness looks fine, it could be having problems internally. I can tell you if I had a 1987 240, I would replace the harness. Its not that hard to do once you remove the intake and if you have a u pull it yard near you, you might find one. They are the same from 1985-1987. You can remove the passenger kick panel on the wrecked car and look where it plugs into the fuel computer, if it has a Volvo sticker on it and a part # you know it is a replacement.
I wish I could look at your car for you and good luck.
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