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740 starts fine then cut out rpm 0 and starts again 700 1987

posted by  someone claiming to be in trouble on  Tue Aug 29 06:16 CST 2006 [RELATED]

hello , I have a 1987 740 gle. The problem is when the engine is cool it is fine or the outside temperture is under 90 degrees it rund fine. But, the when the engine gets hot . It starts to cut off. Rpms go to 0 and then it starts up again. It will keep on doing this until either the engine comes to a stop or the car does. I have researched that it may be the hall sensor. Where is the Hall sensor( does it have another name) and how do replace it? Another thing that I have read is that it maybe crank position sensor. For the life of me, I can not find it? I have already replace the fuel (in tank) pump, coil and the MAss Air sensor. any help would be most appreciated








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    740 starts fine then cut out rpm 0 and starts again 700 1987

    posted by  aleekat on  Wed Aug 30 14:30 CST 2006
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    last visit: Fri Oct 24 13:19 CST 2014
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    The hall sensor is not easy to replace in its entirety. If its just the connector at the base of the distributor, thats simple. If its the complete unit,, better off looking for a distributor from a yard. Most yrs groups, 85 to like 90 have one. Easy to spot, and easy to remove. 8mm and 10mm wrench. Gearwrench works best.
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    Post Back. That's whats makes this forum work.








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      740 starts fine then cut out rpm 0 and starts again 700 1987

      posted by  Blue Horse on  Wed Aug 30 17:02 CST 2006
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      last visit: Mon Apr 8 17:57 CST 2013
      [RELATED]

      Hall effect is only on 85-88. If you get an 89 or later distributor (which looks identical on the outside except no 3 pin connector) you will be very disappointed to find nothing inside but a rotor.








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    740 starts fine then cut out rpm 0 and starts again 700 1987

    posted by  Blue Horse on  Tue Aug 29 10:53 CST 2006
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    last visit: Mon Apr 8 17:57 CST 2013
    [RELATED]

    the Hall effect sensor is inside the distributor. There is no crank position sensor on pre-89 cars.

    Have you checked the Radio Interference Suppression Relay? It can cause symptoms very much like what you are describing.







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