FPR and no start

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  • Adrian_Visser
    R3VLimited
    • Jun 2006
    • 2823

    #1

    FPR and no start

    So my car let me down this morning. Started up cold I let it idle for a minute went to back out of my parking stall and puh. It died wouldn't start again no matter what I did.

    I have fuel and spark. It turns over fine. But when I pulled a plug it was wet, so the engine is flooding itself I believe.

    The fuel pressure measured at the inlet of the rail was ~48psi.

    The fuel pressure doesn't change if I disconnect the vaccum line to the FPR while cranking is that normal or does it indicate that the FPR is faulty?

    Bentley doesn't mention what the FPR should do when cranking, just that at idle it should drop the pressure to 43psi from 46psi at higher revs.

    I have been having intermitant hot starting problems since I got the car a year ago, and it has been cutting out just barely when cold ie. it suddenly drops 200rpm CEL flashes then keeps going like nothing happened. I don't know if this is connected.

    When I went to check it this afternoon it caught for a half a second like it wanted to start but didn't.

    Thoughts?

    '89 Alpine S52 with goodies
  • blocke
    E30 Fanatic
    • Mar 2009
    • 1305

    #2
    Just thowing it out there, but is CPS in good shape?
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    • Adrian_Visser
      R3VLimited
      • Jun 2006
      • 2823

      #3
      I am getting spark doesn't that indicate the CPS is good?

      EDIT: Cps resistance= 515 ohms so it's okay.
      Last edited by Adrian_Visser; 03-24-2010, 06:56 PM.

      '89 Alpine S52 with goodies

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      • Adrian_Visser
        R3VLimited
        • Jun 2006
        • 2823

        #4
        Nobody?

        '89 Alpine S52 with goodies

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        • e30Matt
          R3V Elite
          • Dec 2003
          • 5077

          #5
          Did it spit and sputter or just die as if you shut the key off?

          "See, we're adding a little something to this month's sales contest. As you all know, first prize is a Cadillac Eldorado. Anyone wanna see second prize? Second prize is a set of steak knives. Third prize is you're fired."

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          • e30:)
            Mod Crazy
            • Oct 2008
            • 728

            #6
            sounds like a bad fpr to me. when you unplug the vac line from it it should spike the fp... is there fuel in the vacume line coming from the fpr?

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            • Adrian_Visser
              R3VLimited
              • Jun 2006
              • 2823

              #7
              FUCK!
              I tried a new FPR (yeah $100) same thing barely sputters no start. When I disconnect the electrical connector for the fuel rail (the one under the TB) it starts and runs until it runs out of gas in the fuel rail so it is definitely flooding itself.

              Only things I can think of are a short to ground in the harness to the DME or a bad DME.


              EDIT: it was the DME.

              Further testing at the connector under the TB showed that the DME was grounding the injectors whenever the key was in the run position. A borrowed DME solved the problem.
              Last edited by Adrian_Visser; 03-26-2010, 06:44 PM. Reason: update

              '89 Alpine S52 with goodies

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              • blocke
                E30 Fanatic
                • Mar 2009
                • 1305

                #8
                Thats a funky one.
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                Parts Wanted
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                • Adrian_Visser
                  R3VLimited
                  • Jun 2006
                  • 2823

                  #9
                  Yeah Weird eh.

                  '89 Alpine S52 with goodies

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                  • txtorquemade
                    E30 Mastermind
                    • Mar 2009
                    • 1758

                    #10
                    I'd have never figured that out.
                    sigpic 1987 325is

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