runs fine, then when it warms up it dies, no spark. on 1992 Dodge Ram Wagon B350

my mechanic has replaced computer 3xs, new distributor, replaced ASD twice. when it runs its the best its been in years, but dies. 70,000miles on van, very low mileage. he is at his wits end and suggestions on a new way to look at or check something different. any help would be appreciated.2

by in Dundalk, MD on September 07, 2010
1 answer 1 comment
ANSWER by on September 07, 2010
Your Mechanic has over looked the Crankshaft position sensor. This sensor, when failing will usually fail when hot. Without this sensor input to the PCM, your ASD relay will not energize and the vehicle will not start because there will be no voltage supplied to the ignition system or fuel injectors. Also, sensor wiring is critical. This applies to all sensors in the fuel management system. Also, if the distributor has been replaced, it MUST be syncronized with the Crank position sensor. The pickup plate in the distributor is a Camshaft position sensor. You cannot adjust the timing by turning the distributor.
COMMENT by on September 08, 2010
Thanks very much, I will pass this info on to my mechanic. Question, about the pick-up plate and timing, whats the procedure to adjust the timing. Again thanks for help I sure hope this does it it, I love my van but ist been a nightmare trying to figure this out.

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