Really cant find the problem...

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  • ashton
    Wrencher
    • Jan 2011
    • 240
    #1

    Really cant find the problem...

    I just rebuilt my 88 325i from the head up. new spark plug wire, new spark plugs, fuel pump, fuel filter, o2 sensor, head gasket, head bolts, rotor button, coolant temp sensor, afm, cold air intake, and more. My car will sputter after 3 grand and die. I've replaced things because I thought it was the problem, but now im lost and im not sure what it is. It runs fine until the engine starts to warm up. Then it will sputter and I lose throttle. Only things I have in mind are crank position sensor and coil. Other than that im lost. Please help me out. And I also put injector cleaner in it. And when.it warms up.the check engine light for o2 sensor comes up, but i just put a new one in it. Thanks.

    Ashton.
    Last edited by ashton; 06-07-2011, 07:24 PM.
    Tags: None
    • JTapper
      E30 Modder
      • Sep 2009
      • 847
      #2
      You can rule out crank position sensor. If that were the case, it wouldn't run at all.
      sigpic
      Turbo Cabrio project: http://eurowerks.org/showthread.php?t=19677

        Comment

        • ashton
          Wrencher
          • Jan 2011
          • 240
          #3
          Originally posted by JTapper
          You can rule out crank position sensor. If that were the case, it wouldn't run at all.
          Alright.

            Comment

            • jlevie
              R3V OG
              • Nov 2006
              • 13530
              #4
              The "O2 sensor fault" and rough idle suggest intake leaks. The high rpm fault suggests a fuel delivery problem, bad harmonic balancer, weak CP, or bad engine harness. If it only happens when using a lot of throttle, the WOT switch in the TPS could be bad.

              Have a smoke test run on the intake and run the fuel system tests in the Bentley.
              The car makes it possible, but the driver makes it happen.
              Jim Levie, Huntsville, AL

                Comment

                • ashton
                  Wrencher
                  • Jan 2011
                  • 240
                  #5
                  Originally posted by jlevie
                  The "O2 sensor fault" and rough idle suggest intake leaks. The high rpm fault suggests a fuel delivery problem, bad harmonic balancer, weak CP, or bad engine harness. If it only happens when using a lot of throttle, the WOT switch in the TPS could be bad.

                  Have a smoke test run on the intake and run the fuel system tests in the Bentley.
                  Can you explain what the Bentley is and what is the website?

                    Comment

                    • davem
                      Mod Crazy
                      • Jun 2010
                      • 705
                      #6
                      Originally posted by ashton
                      Can you explain what the Bentley is and what is the website?
                      The bentley is the most widely used car repair manual for the e30.



                      You should pick one up or at least google the PDF version.

                        Comment

                        • matt0300
                          E30 Addict
                          • Mar 2011
                          • 549
                          #7
                          Afm. And it could be ur cps if its just starting to go bad or Tps.

                            Comment

                            • ashton
                              Wrencher
                              • Jan 2011
                              • 240
                              #8
                              Originally posted by matt0300
                              Afm. And it could be ur cps if its just starting to go bad or Tps.
                              Alresdy replaced the afm. So cps or tps?

                                Comment

                                • ashton
                                  Wrencher
                                  • Jan 2011
                                  • 240
                                  #9
                                  Originally posted by jlevie
                                  The "O2 sensor fault" and rough idle suggest intake leaks. The high rpm fault suggests a fuel delivery problem, bad harmonic balancer, weak CP, or bad engine harness. If it only happens when using a lot of throttle, the WOT switch in the TPS could be bad.

                                  Have a smoke test run on the intake and run the fuel system tests in the Bentley.
                                  I took my tps off and there was oil in it. Is that a problem?

                                    Comment

                                    • matt0300
                                      E30 Addict
                                      • Mar 2011
                                      • 549
                                      #10
                                      I would swap it, I have an extra if u need one

                                        Comment

                                        • ashton
                                          Wrencher
                                          • Jan 2011
                                          • 240
                                          #11
                                          Originally posted by matt0300
                                          I would swap it, I have an extra if u need one
                                          How much? And would my exhaust being unbolted from the resignator back cause any problems due to less back pressure?

                                            Comment

                                            • kingston
                                              R3VLimited
                                              • Jun 2010
                                              • 2669
                                              #12
                                              You can have my old coil if you want it, as long as you pay the shipping. I put a new one on mine just for piece of mind, but it was working fine when I took it off.
                                              Originally posted by LJ851
                                              kingston is the play by play announcer for this thread.
                                              ‘Tis by the grace of God that my cars run!

                                              Originally posted by unloadedak
                                              #teamross
                                              Siobhan's Build Thread - UPDATED!

                                                Comment

                                                • mikeedler
                                                  R3V OG
                                                  • Feb 2004
                                                  • 6707
                                                  #13
                                                  I had a similar problem years ago, changed the wiring harness, and it ran fine. Only changed the harness because I had tried everything else already.

                                                    Comment

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