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Looks like you're finding the ECT by elimination. You may be committed to replacing it already, but you'd be more satisfied if you could indict it positively first, by measuring its resistance from the ECU connector. The technique is in the book. Of course, if it is intermittent mechanically or with temperature, you wouldn't vindicate it with a good reading.
Not sure exactly which early 90's 240 may have eliminated the 5th injector so if yours has one, consider that could be a goner. With the LH2.4 OBD test sequence, you can activate it, the other injectors and the idle motor to test. See the FAQs if you're not familiar with this.
Also on your final wierd note: It should not run with the fuel pump relay removed. It will not run with the main fuse removed. At all.
The confusion comes from the labeling on the fuse panel and the info in the owners manual which is wrong in most cases. The main pump fuse is the FI system fuse under the hood, not fuse #6 -- until 91. If you pull the plug on the main pump, under the seat, you'll still get enough fuel from the transfer (tank) pump (fuse 4) to idle, after a fashion.
When the FPR (which would have been my guess) was replaced, you say it was OK for a while. Do you discount the possibility of having killed the replacement somehow?
Also, a note-- the LH2.4 ECU remembers its default mixture setting, or limp home. Maybe this is my "wierd note" but I think I've caught it remembering this fuel map after doing both an OBD reset, and once, pulling the main fuse for a few seconds. Pulling the plug of the ECU always flushed its memory. And your ignition is EZ if you have the OBD.
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Art Benstein near Baltimore
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