Need help with e30 crancking but wont turn over.

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  • staysideways
    Grease Monkey
    • Dec 2013
    • 373

    #1

    Need help with e30 crancking but wont turn over.

    Hi guys i need your help. We did a timing belt,water pump,camshaft seal and oring,thermostat on my friends car and now it cranks but wont start. First i thought i did the timing wrong and bent valves. But no double checked timing and its right. All tdc marks line up.the belt is on firm and everything is connected. Except for radiator and hoses. I am getting yellowish spark and the injectors should be firing if all cylinder are flooding and weting the plugs.

    Pulled plugs and dried them with compressed air. Double checked spark still have it. Put the plugs back in still doesnt turn over. Pulled them out they are wet again.

    I have a crank position sensor on the way now. But it will be delivered to me in 8 hours. So any help would be greatly apriciated.
    Btw the rotor and cap are fairly new the rotor has lots of life left on it and the cap has minor carbon but i sanded those with 2000 grit sand paper twich over each of the prong things.

    Could have we disconnected something or banged the crank position sensor?

    1989 E30 325i Sedan Alpine
  • spdracrm3
    E30 Modder
    • Sep 2009
    • 959

    #2
    Well if you have spark its not a crank sensor issue ,with wet plugs it should at least try to fire even if timing is somehow wrong, which is what I would suspect. Make sure with #1 piston at TDC (checked with screwdriver thru plug hole while turning motor at crank pulley, piston as high as it will go) check crank pulley TDC marks and check distributor rotor points to #1 or #6 plug wire in cap .

    Sent from my SM-G360V using Tapatalk
    Angus
    88 E30M3 X2
    89 325IX
    92 R100GS/PD
    :)

    Comment

    • uturn
      E30 Modder
      • Dec 2010
      • 983

      #3
      Are the plug wires correct from the cap to the cylinders?

      Comment

      • staysideways
        Grease Monkey
        • Dec 2013
        • 373

        #4
        I did that and at tdc the rotors stays just a little behind the #1mark in the cap

        1989 E30 325i Sedan Alpine

        Comment

        • staysideways
          Grease Monkey
          • Dec 2013
          • 373

          #5
          Originally posted by uturn
          Are the plug wires correct from the cap to the cylinders?
          Yea they are
          Originally posted by spdracrm3
          Well if you have spark its not a crank sensor issue ,with wet plugs it should at least try to fire even if timing is somehow wrong, which is what I would suspect. Make sure with #1 piston at TDC (checked with screwdriver thru plug hole while turning motor at crank pulley, piston as high as it will go) check crank pulley TDC marks and check distributor rotor points to #1 or #6 plug wire in cap .

          Sent from my SM-G360V using Tapatalk

          1989 E30 325i Sedan Alpine

          Comment

          • staysideways
            Grease Monkey
            • Dec 2013
            • 373

            #6
            Bump any help?

            1989 E30 325i Sedan Alpine

            Comment

            • Marshmellow
              Noobie
              • Nov 2015
              • 33

              #7
              experiencing a similar issue where my 1990 325i will sometimes start up no problem and other times will just keep cranking to no avail. Pulled the sparkplugs and all have fuel on them along with my oil smelling like fuel as well. any help would be appreciated!

              Comment

              • cWalk3r
                Advanced Member
                • Jun 2014
                • 178

                #8
                Figure this out? I had a problem like this before. Did u check fuel spark and air? My car seemed to have all 3 but when I dug. Deeper I figured out that the fuel pump was only working occasionally because of a bad fuel pump relay.

                Comment

                • Seawolf
                  Wrencher
                  • Feb 2015
                  • 270

                  #9
                  Originally posted by Marshmellow
                  experiencing a similar issue where my 1990 325i will sometimes start up no problem and other times will just keep cranking to no avail. Pulled the sparkplugs and all have fuel on them along with my oil smelling like fuel as well. any help would be appreciated!
                  Simple check: Pull the vacuum line off the Fuel Pressure Regulator, if you see fuel the diaphragm has failed and high pressure fuel is flooding the inlet manifold and cylinders.

                  - Just had/fixed this problem.

                  Comment

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