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740 no spark, no wiring diagram! 700

posted by  cptvideo on  Tue Apr 6 09:54 CST 2004
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Its the old 740 no-start, no-spark problem. I've read all about it here and elsewhere.

Mine is a '91 740 no-turbo sedan (Rex-Regina system). I've replaced the engine-speed sensor with a new one. No go. I've swapped the radio-suppession relay with the cooling fan relay. No go. I've tested the resistances in the coil and they're within normal limits.

I know that the power stage is suspect, but I don't know how to test it without going out and buying another. Is there a test for this thing? Or any way to descriminate between a power stage problem and an ECU problem?

Thanks, Craig






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