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That looks just like the knock sensor that was on my '87 240. Mine also had a "flopping" connector. All I did was get a new one from fcpgroton. I didn't need a part number, I think there is only 1 knock sensor for that vintage.
BTW I could never tell the difference between having the knock sensor connected or not on the '87. The car never knocked, and the timing wasn't getting WAY retarded either. If I unplug the knock sensor on the '89, the timing is so retarded that it's a total dog on acceleration (and of course the check engine light comes on). The '89 knock sensor looks different, too. Different systems I guess.
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Matt L. Cary, NC three '89 740 sedans
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