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Ok, here's one for you experts 850 1996

posted by  T-luv on  Mon Aug 11 07:01 CST 2003
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My '96 base 850 cranks over but does not start. I checked but there are no OBD codes. Not a fuel problem. Seems the coil has no spark. The strange thing is that when I pull a few things apart, the car will start. This is an intermittant problem. Most times the car starts just fine. I replaced the ignition switch and coil but saw no improvement. What could be intermittantly failing but would not set a code? Appreciate any suggestions. I've been scratching my head on this one for a while.

Thanks,
Tluv '96 850 145k and running great (once it starts:))








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    Ok, here's one for you experts 850 1996

    posted by  someone claiming to be Android on  Tue Aug 12 12:41 CST 2003 [RELATED]

    Camshaft positioning Sensor. I had the same problem.








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    Ok, here's one for you experts 850 1996

    posted by  Erwin on  Mon Aug 11 11:41 CST 2003
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    last visit: Thu Oct 23 10:39 CST 2014
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    Just what things are you pulling apart that makes the car start? How did you confirm there is no spark?

    I'd think that no signal from the camshaft position sensor would throw a code.
    --
    Erwin in Memphis, '88 745t 190,000 miles, '95 855t 92,000 miles








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      Ok, here's one for you experts 850 1996

      posted by  T-luv on  Tue Aug 12 06:47 CST 2003
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      I typically pull the coil wire and check for spark. If it is ok, I pull a plug and check for spark there too. One time, I pulled a sparkplug and my wife cranked the engine. Had no spark for the first 2-3 seconds but then I saw spark and the engine fired (4 of the 5 cylinders anyway). Best I can tell is that it is an intermittent spark problem, but again, no codes.

      T-luv








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    Ok, here's one for you experts 850 1996

    posted by  danielflading on  Mon Aug 11 08:10 CST 2003
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    $1 says it is your fuel pump relay going bad. causes intermittant stalling and starting problems.

    Dan








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      Ok, here's one for you experts 850 1996

      posted by  T-luv on  Mon Aug 11 10:31 CST 2003
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      danielflading,

      Excellent suggestion about the fuel pump relay. I actually though about this and swaped the fuel pump relay with the one right next to it in the fuse box (both relays have the same pinout). I did this a month ago but it made no difference. I can hear the fuel pressure building in the fuel rail, so i'm assuming i'm getting fuel. Also tried some starter fluid but that didn't work either.

      I hate to put in a new camshaft position sensor at $150 since I am not getting any codes.

      I tell ya, I'm stumped.

      T-luv








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        Ok, here's one for you experts 850 1992

        posted by  someone claiming to be Dmitri on  Tue Aug 12 02:12 CST 2003 [RELATED]

        > both relays have the same pinout

        No they don't! The three identical relays
        have nothing to do with fuel pump. One of the two
        bigger and different relays is headlight, the other
        one is fuel pump.

        Dmitri








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          Ok, here's one for you experts 850 1996

          posted by  T-luv on  Tue Aug 12 06:34 CST 2003
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          I thought the fuel pump relay was the one in the middle (towards the firewall). This is the one I swapped. The car did not start again this morning. I disconnected the fuel rail and had very little pressure (should there be more after cranking?). I put a cup under the disconnected rail and cranked the engine. The cup filled with fuel so the fuse, relay, and pump are all working. Hooked everything back up and the car started fine. Wierd. What gives?

          T-luv







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      Ok, here's one for you experts 850 1996

      posted by  Flingster on  Mon Aug 11 10:12 CST 2003
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      last visit: Mon Nov 21 18:23 CST 2011
      [RELATED]

      Although you didn't get a code, another possibility could be the cam position sensor. Usually, the same symptoms, cranks but won't start (the code you would get would be 3-1-4 on A6). As mentioned earlier, the fuel pump relay may be the culprit or the fuel system relay. Good luck.








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      Ok, here's one for you experts 850 1996

      posted by  Leon on  Mon Aug 11 09:41 CST 2003
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      last visit: Fri Mar 28 12:49 CST 2014
      [RELATED]

      Do the relays go bad in the 850s too? I figured after all those years with the 700/900s that Volvo would get the relay problem corrected. I carry a spare fuel pump relay in all my 700/900s. Did I figure wrong? I hate it when I do that.
      --
      Leon Ramseur in NC, 1997 855, 1995 945, 1990 760, 1990 740 & 1990 745. 90 740 & 97 855 FOR SALE.







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