Car buckin'.

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  • ashton
    Wrencher
    • Jan 2011
    • 240
    #1

    Car buckin'.

    I had my 88 325i ok the jack to roll my fenders for the new diamond racing Steelies for about a hour and a half. Left the garage, got about a mile and a half down the road and it started sputtering and bucking and it would rev over 1800. So I pulled over and sat for about 5 minutes. The fuel pump was making an unsteady wining noise but then it got steady and the car ran fine. The fuel pump and fuel filter are new. This is the first problem I've had since I put the new pump on it like 3 weeks ago. This is my daily driver so I need her running, if you have anybidea what's goin on please let ne know.

    Thanks.
    Tags: None
    • jlevie
      R3V OG
      • Nov 2006
      • 13530
      #2
      The variation in sound from the fuel pump suggests a bad pump, flaky fuel pump relay, or some other problem with the fuel system. With the engine running you should not be able to hear the pump at all.
      The car makes it possible, but the driver makes it happen.
      Jim Levie, Huntsville, AL

        Comment

        • ashton
          Wrencher
          • Jan 2011
          • 240
          #3
          Originally posted by jlevie
          The variation in sound from the fuel pump suggests a bad pump, flaky fuel pump relay, or some other problem with the fuel system. With the engine running you should not be able to hear the pump at all.
          The pump has been loud ever since I put it in. I got it at advance auto with a one year warranty a month ago. I went to an autox even this weekend and the e30's there had loud pumps too.

            Comment

            • jlevie
              R3V OG
              • Nov 2006
              • 13530
              #4
              I have an 86, 87, and 88 E30, all with OE pumps and none of those pumps can be heard above an idling engine. My 88 is a race car and has zip for interior and I have an OE transfer pump in the left side of the tank and an OE high pressure pump in the right side. If you jumper the fuel pump relay you can barely hear the pumps run. So a loud pump is definitely not normal.

              An OE pump will make noise if it is worn, or if it is having to work too hard. Possible causes of a pump having to work too hard are a clogged filter, rust in the tank that partially clogs the inlet screen, or an obstruction in the fuel return line. As a caution, rust is very abrasive and will wear a pump out quite rapidly, Then there's the possibility that your Advance pump just isn't built to the standards of a OE pump and is just naturally noisy, but check the other possibilities.
              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
                  I have an 86, 87, and 88 E30, all with OE pumps and none of those pumps can be heard above an idling engine. My 88 is a race car and has zip for interior and I have an OE transfer pump in the left side of the tank and an OE high pressure pump in the right side. If you jumper the fuel pump relay you can barely hear the pumps run. So a loud pump is definitely not normal.

                  An OE pump will make noise if it is worn, or if it is having to work too hard. Possible causes of a pump having to work too hard are a clogged filter, rust in the tank that partially clogs the inlet screen, or an obstruction in the fuel return line. As a caution, rust is very abrasive and will wear a pump out quite rapidly, Then there's the possibility that your Advance pump just isn't built to the standards of a OE pump and is just naturally noisy, but check the other possibilities.
                  I guess ill check the relays and the pump and filter.

                    Comment

                    • BMWRacing15
                      Noobie
                      • Jan 2011
                      • 7
                      #6
                      I had a similar problem and it turned out to be the TPS.

                        Comment

                        • E30_fiend
                          R3V OG
                          • Apr 2006
                          • 7348
                          #7
                          I would put my money on the fuel pump relay or the main relay.

                          Get new ones and put em in. If they dont fix the problem, at least you have new relays that WILL fail eventually


                          Taylor
                          Need a performance chip for you BMW? Shoot me a PM and I'll get you taken care of!!
                          Taylor- Follow me on Instagram @e30_fiend

                            Comment

                            • ashton
                              Wrencher
                              • Jan 2011
                              • 240
                              #8
                              Originally posted by jlevie
                              The variation in sound from the fuel pump suggests a bad pump, flaky fuel pump relay, or some other problem with the fuel system. With the engine running you should not be able to hear the pump at all.
                              And the car won't start the first time when I go to start it up for the first time everyday.

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