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I've got a 90 745t with the exact same problem. I've replaced almost everything in the engine and this still happens. I've narrowed it down and it seems to only happen when the temperature outside is between cold and hot, say 35 degrees. I replaced the temp sensor (the one for the computer) but will check it this weekend. I even sent all the injectors out to be cleaned (including the cold start injector) thinking that they were leaking, but they weren't. I'd love to figure out what is! On a similar note, I also have problems sometimes where the engine will run fine but will die after about 10 seconds. It restarts ok. Is there something in the LH computer that switches out of "start" mode to "run" mode after 10 seconds? Does anyone know?
Sometimes after it floods I can start it by pulling the wires off of all the injectors and turning it over until it catches. Then putting the wires back on will get it to start, but that only has worked about 50% of the time. Otherwise I have to pull the plugs, disconnect the coil wire and injector wires, turn the engine over a few times, clean the plugs, put back together and go. I can do the whole procedure in about 15 minutes now (done it many many times this spring).
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