s50 cranking problems

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  • hexe30
    Advanced Member
    • Jun 2015
    • 141
    #1

    s50 cranking problems

    Need some help on this one gentlemen. My car will start (more or less) fine in the morning or evening. Might not fire on the first turn over but it cranks well and will fire up right quick.

    Now, if I drive the car for some time (doesn't matter if it's 5 minutes or an hour) and then park for just a few minutes (up to 30 mins) when I come back out and try to start the car its hard to keep it running and dies like it's flooded out. If I just let it sit for a while (minimum 10 minutes, usually much longer) then it will usually fire right back up.

    I have 95 s50 and am running the trm chip/tune, Injectors, flywheel, standard upgrades, etc. Any ideas? Some sort of vapor lock? It seems it's fuel related.
    Last edited by hexe30; 08-08-2015, 11:35 AM.
    Tags: None
    • M3PO
      E30 Addict
      • May 2012
      • 537
      #2
      Why does it seem "fuel related"? Does it run fine otherwise? Idles fine, plenty of power?

        Comment

        • hexe30
          Advanced Member
          • Jun 2015
          • 141
          #3
          Runs great. No complaints except for when i try to recrank it immediately after shutting it off.

            Comment

            • hexe30
              Advanced Member
              • Jun 2015
              • 141
              #4
              Guessing no ideas?

                Comment

                • M3PO
                  E30 Addict
                  • May 2012
                  • 537
                  #5
                  There's a lot of things that it could be. But when I think temperature related, I immediately question the DME coolant temp sensor.

                    Comment

                    • berlow94
                      E30 Enthusiast
                      • Jan 2013
                      • 1063
                      #6
                      Are you using an OBD1 or OBD2 fuel rail? Did you install a check valve in-line? Sounds like your rail is getting vapor locked.
                      The best one-stop shopping for German car parts and lifestyle: http://www.gutenparts.com/

                        Comment

                        • AndrewBird
                          The Mad Scientist
                          • Oct 2003
                          • 11892
                          #7
                          Leaky injectors bleeding fuel into the cylinders?

                          Does it take a lot of cranking to get it to fire up?

                          Bad fuel pressure regulator?

                            Comment

                            • hexe30
                              Advanced Member
                              • Jun 2015
                              • 141
                              #8
                              Originally posted by berlow94
                              Are you using an OBD1 or OBD2 fuel rail? Did you install a check valve in-line? Sounds like your rail is getting vapor locked.
                              Bought the car w/ the swap. How can I tell/ check what your asking?

                                Comment

                                • hexe30
                                  Advanced Member
                                  • Jun 2015
                                  • 141
                                  #9
                                  Originally posted by AndrewBird
                                  Leaky injectors bleeding fuel into the cylinders?

                                  Does it take a lot of cranking to get it to fire up?

                                  Bad fuel pressure regulator?
                                  As long as the car is cool it cranks as if it were a new car.

                                    Comment

                                    • berlow94
                                      E30 Enthusiast
                                      • Jan 2013
                                      • 1063
                                      #10
                                      Originally posted by hexe30
                                      Bought the car w/ the swap. How can I tell/ check what your asking?
                                      Obd 2 rail should have a remote FPR and be shiny stainless steel.
                                      OBD 1 will have the FPR built into the rail right by cylinder 6 and be painted black.

                                      Sent from my SAMSUNG-SGH-I747 using Tapatalk
                                      The best one-stop shopping for German car parts and lifestyle: http://www.gutenparts.com/

                                        Comment

                                        • hexe30
                                          Advanced Member
                                          • Jun 2015
                                          • 141
                                          #11
                                          OBD1

                                          Replaced the cam positioning sensor and that didn't do it.

                                            Comment

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