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240 wants to start, but backfires, then shuts down 200 1986

posted by  lmwjerry on  Tue Aug 11 14:41 CST 2009
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last visit: Wed Nov 7 20:03 CST 2012
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My son's 1986 245DL broke down on the cross Bronx expressway last week. Realizing that it would cost us a fortune to repair in the city, we put it on a tow dolly and towed it home to PA so I could sort it out.
The car wants to start but will only remain running for about 4 seconds before backfiring, then stopping. I've checked the timing belt; all marks line up perfectly with the distributor rotor pointing to the number one cylinder. I feel that I've covered the mechanical side, I need some suggestions on electrical trouble shooting.
PS: I've already ruled out a plugged catalytic converter.








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    240 wants to start, but backfires, then shuts down 200 1986

    posted by  jacksonville on  Tue Aug 11 15:08 CST 2009
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    last visit: Fri Apr 8 18:06 CST 2011
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    ok 2 things backfiring is related to timing or valves belt can skip and the crank pulley inner sleave can slip which tells you the timing marks can be off, you need to check that first and I just had a 91 740 that the pin that lines up the cam gear it sheared throwing the timing off....seriously sounds like you have a timing problem








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      240 wants to start, but backfires, then shuts down 200 1986

      posted by  lmwjerry on  Wed Aug 12 15:00 CST 2009
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      OK,
      I've checked the cam and crank pulleys and both have their indexing tab(and pin) in tact and all timing marks line up. While checking the rotor, I noted a carbon trail on my cheap after market cap that flows around to three of the four conductive points on the inside of the cap.(probably my mis-fire!). Now that I've found the potential misfire problem, I start to turn the car over, but neither of my fuel pumps are working!








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        Check Hall-effect sensor wiring 200 1986

        uid 27's pic
        posted by  Art Benstein on  Wed Aug 12 15:07 CST 2009
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        last visit: Fri Oct 17 20:10 CST 2014
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        Hi there,

        It is very common for the Hall-effect sensor wiring to be shorting out inside the distributor and at the connector. The carbon trail sounds like a dead-nuts explanation, but it may be the distributor low-side wiring is the worse of the two distributor troubles. No spark, no fuel.

        --
        Art Benstein near Baltimore

        "Everybody's got to believe in something. I believe I'll have another beer." (W. C. Fields)







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