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Changed Hall Sensor, Ignition Control Module - Still No Spark! What Next?! AHHHH!! 700 1988

posted by  daves745t on  Sun Feb 20 08:24 CST 2005
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last visit: Sun Apr 27 12:11 CST 2014
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This has made my weekend pretty miserable. My 88 745t died out of nowhere. Then I'm getting intermittent starts, but when I put it in gear she dies completely or sometimes it will drive a short distance, then cut out, bump start, cut out, etc. and then out for good. The tach just drops to 0 when this occurs. She cranks freely (and when she is cranking tach needle doesn't move, if that is significant) and is getting fuel.

I've determined that it is not getting any spark to the coil. I swapped the coil with a known good one and same thing happens. I changed the Ignition control module and the Hall Sensor. With respect to the Hall Sensor, I bought a semi-used unit that came with the distributor plate and rotor (my local guy had a customer that just totaled his 88 745t on black ice and he had just replaced it).

Anyway, what would you do next? This is driving me crazy. Could it be the distributor? When I had it apart to replace the Hall sensor, the distributor cap did not look burnt, but at the same time it hasn't been changed in a while. But would that cause no spark at the coil?

Any thoughts, opinions, wild a*s guesses appreciated!

-Dave






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