Cranks but no start?

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  • jamiholzbach
    Grease Monkey
    • May 2006
    • 311

    #1

    Cranks but no start?

    The car cranks, but won't start. The fuel pump won't run, and I've got no spark. The voltage at the fuel pump relay reads 12V until I crank the motor, then it drops down to 2-3V. the battery reads 12V but at the other end of the small cable(w/ fusable link) I read 12V until I crank or put the ingnition to run, then it drops down to 2-3V at the block on the firewall. If I wait till the next day, it does it again(starts at 12v then drops down to 2-3v and stays that way as long as I'm trying to test it). WTF!
  • jamiholzbach
    Grease Monkey
    • May 2006
    • 311

    #2
    corrosion?

    anybody see anything like this before?

    Comment

    • OSM e30
      Member
      • Jan 2007
      • 55

      #3
      check your crank position sensor, exact same thing happened to me

      Comment

      • jamiholzbach
        Grease Monkey
        • May 2006
        • 311

        #4
        It was corrosion!!!

        the fusable link was corroded! I started checking voltage through the cable jacket, and when I got to the link, I had 12v on one side, moved 1/8" over, and nothing. I couldn't even read continuity through it, so...
        Now what do I replace it with?

        Comment

        • jlevie
          R3V OG
          • Nov 2006
          • 13530

          #5
          You could bypass the fusible link, or replace it with a fuse. My preference would be a fuse and I think I'd try a 30a to start with.
          The car makes it possible, but the driver makes it happen.
          Jim Levie, Huntsville, AL

          Comment

          • StereoInstaller1
            GAS
            • Jul 2004
            • 22679

            #6
            I am using an AGU type car stereo fuseholder, available at most all car stereo shops for about $10 and a 50A fuse.

            Closing SOON!
            "LAST CHANCE FOR G.A.S." DEAL IS ON NOW

            Luke AT germanaudiospecialties DOT com or text 425-761-6450, or for quickest answers, call me at the shop 360-669-0398

            Thanks for 10 years of fun!

            Comment

            • houstonh
              Wrencher
              • Aug 2007
              • 293

              #7
              Where is the fusable link located on a 89 325i coupe?
              Is this in the trunk? or engine bay?

              Is it the "flat spot" on the wire? just curious.. I think this could be my problem.

              Comment

              • jlevie
                R3V OG
                • Nov 2006
                • 13530

                #8
                Is it the "flat spot" on the wire?
                Yep.
                The car makes it possible, but the driver makes it happen.
                Jim Levie, Huntsville, AL

                Comment

                • jamiholzbach
                  Grease Monkey
                  • May 2006
                  • 311

                  #9
                  $.50 fix

                  I spent $50 to get the car towed home:(, and $.50 to fix it with six inches of fusible link wire.:D

                  Comment

                  • ethirdy
                    E30 Addict
                    • Nov 2007
                    • 406

                    #10
                    Originally posted by houstonh
                    Where is the fusable link located on a 89 325i coupe?
                    Is this in the trunk? or engine bay?

                    Is it the "flat spot" on the wire? just curious.. I think this could be my problem.
                    Where is it on an 86 325e? Would jumpstarting the opposite terminals of the batteries blow this? (non Bmw owners should never be trusted with jumper cables LOL)
                    Originally posted by alpinaclone
                    Since the real economy is in the shitter, I say we start our own.

                    This is how it works; you buy my junk, then I will buy more junk and so on so forth etc. etc. Think of the future of your children and buy my stuff.

                    Comment

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