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93 960 No start but starts when 1 plug is removed STRANGE!

posted by  surfindude on  Thu Apr 28 14:45 CST 2005
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last visit: Wed Jul 2 02:00 CST 2008
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I bought a 93 960 148K dirt cheap yesterday. Last owner replaced fuel pump (didn't ask if fr or rear) after he ran out of gas and wouldn't start. Wouldn't start since, I pulled code 123 - rear ect was unplugged. Valve timing correct. Tried WOT cranking for a few minutes (30 sec max at once)to no effect. It's on the verge of running but just won't start. Fuel pressure seems good(don't have guage). Tried resoldered fuel relays no effect. I checked for spark, seems somewhat erratic to me. THEN IT STARTED AND RAN WITHOUT 1 SPARK PLUG in # 2 or 3 or 4 (I was checking for spark with a old plug, removed 1 from engine and tried, don't ask me why I did this I don't know, didn't check all didn't seem necessary) although compression was blasting out. What the hell why won't it start with all plugs in (recently replaced bosch platinums). The flame trap was cloggd replaced it. Changed cam sensor no effect. Added plenty of gas to tank, tried dousing card cleaner into TB no effect. No other codes, wiring seems intact. Will a 850 crank sensor fit? I tried to remove the 960 sensor is it a T25 bit? It isn't a 10mm like my 850. Any comments / suggestions?








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    93 960 No start but starts when 1 plug is removed STRANGE!

    posted by  darmstrong on  Fri Apr 29 01:40 CST 2005
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    So, pulling one of the spark plug wires doesn't help, only pulling the plug itself helps?

    I'm wondering if the plug wires connected correctly. All I can think of is that if a cylinder is not getting spark at the right time, it is of course not contributing. Removing the plug from the hole is maybe reducing backpressure from the compression stroke enough to allow the few correctly timed cylinder ignitions to turn the engine in a crippled state.

    Ensure that your wires are connected correctly, and then have an assistant put a timing light on each wire while cranking, to ensure that spark is being delivered through each wire.

    --
    David Armstrong - '86 240(350k km?), '93 940T(270k km), '89 240(parts source for others) near Toronto








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      93 960 No start but starts when 1 plug is removed STRANGE!

      posted by  surfindude on  Fri Apr 29 01:56 CST 2005
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      last visit: Wed Jul 2 02:00 CST 2008
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      The 960 has coil on plug (can't use timing light), they are numbered but I'll check to see if a couple were swiched around. Also 3 cylinders were checked and ran the same. Thanks







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