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Tps fluctuation when engine running. Why?

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  • Tps fluctuation when engine running. Why?

    Hi guys, this problem has just started recently. At the same time, my ign power had been playing up also.

    Basically with the engine off, the tps closed value is static which is what I want (tps closed).
    As soon as I start the engine, tps value jumps from 4 to 15%. I then shut down and it is back to normal. Why had this just started? Battery voltage is stable at approx 13.8 to 14v.

    I'm thinking that it is a bad earth somewhere. What do you guys think?
    Last edited by Chris; January 3rd, 2011, 04:18 PM.
    Mitsubishi Galant VR4. SM4 1.09. T51R SPL E85. Motec SDL. 425kw at 4. 10.93@135mph.
    Mitsubishi Galant AMG. Evo IX SM4 1.07. Gt30r 98Ron. Auto. Street car.
    ​​​​

  • #2
    Yeah, the sensor ground perhaps, what about the other sensors. Alternatively could be the tps itself.

    Chris
    He gets his lap dogs to do his talking for him. Buzzard is a good example.

    Comment


    • #3
      Ill grab the laptop out and check. Currently I'm seeing the tps fluctuate through the dash display.
      Mitsubishi Galant VR4. SM4 1.09. T51R SPL E85. Motec SDL. 425kw at 4. 10.93@135mph.
      Mitsubishi Galant AMG. Evo IX SM4 1.07. Gt30r 98Ron. Auto. Street car.
      ​​​​

      Comment


      • #4
        I think this could be wear in the throttle shaft / bush. When the engine starts the vacuum on the plate slightly moves the shaft position on the pot.

        Why is the TPS reading 4% with the engine stopped? Will it calibrate to 0% or have you manually set the limits?

        Comment


        • #5
          It is 0 when stopped. But fluctuates when running. It of a pretty much new (under 10000km) tps and tb.
          Mitsubishi Galant VR4. SM4 1.09. T51R SPL E85. Motec SDL. 425kw at 4. 10.93@135mph.
          Mitsubishi Galant AMG. Evo IX SM4 1.07. Gt30r 98Ron. Auto. Street car.
          ​​​​

          Comment


          • #6
            I was just wondering if there is a difference in voltage with the tps range with the engine running vs not running. I haven't checked as yet but just wondering if anybody knows off the top of their head
            Mitsubishi Galant VR4. SM4 1.09. T51R SPL E85. Motec SDL. 425kw at 4. 10.93@135mph.
            Mitsubishi Galant AMG. Evo IX SM4 1.07. Gt30r 98Ron. Auto. Street car.
            ​​​​

            Comment


            • #7
              TPS supply is regulated to 5 volts. There is no difference in the voltage engine running or not.

              Cris
              He gets his lap dogs to do his talking for him. Buzzard is a good example.

              Comment


              • #8
                What about the coolant and air temp sensors? You seeing any fluctuations in line with the TPS there also?

                Chris
                He gets his lap dogs to do his talking for him. Buzzard is a good example.

                Comment


                • #9
                  Hi Guys, Thanks for such an informative forum . I to am having the same problem with the tps fluctuating. I have checked the voltage and have what seems to be a stable voltage ( using digital multimeter ) . The earth seems fine also with the air temp and coolant temp sensors stable looking at the log. I have also checked the throttle shaft with no play evident. Does anyone have any ideas as to what is going on. Cheers

                  Comment


                  • #10
                    Update.

                    I believe both problems have been resolved. Earth loops.

                    Comment


                    • #11
                      Ian is correct.

                      I rewired my battery relocation and car alarm (actually installed a new one).
                      I had a bunch of unknown wires which are now connected (from previous installer).

                      I re-torqued all the earth cables and +ve 12v cables.
                      So far so good.

                      No other changes were made.
                      Mitsubishi Galant VR4. SM4 1.09. T51R SPL E85. Motec SDL. 425kw at 4. 10.93@135mph.
                      Mitsubishi Galant AMG. Evo IX SM4 1.07. Gt30r 98Ron. Auto. Street car.
                      ​​​​

                      Comment


                      • #12
                        The problem returned after a tps swap and the grounding clean up.

                        I am monitoring the tps % via my motec SDL.
                        While the problem was occuring, I decided to connect the the SM4 and see what the go was. The problem was due to the voltage range. The closed tps (0%) value was lower than specified which caused an error and made the tps reading to fluctuate.

                        I dropped it a level (- key) and it is constant 0% when the engine is running now. Hopefully this will solve the problem.
                        Mitsubishi Galant VR4. SM4 1.09. T51R SPL E85. Motec SDL. 425kw at 4. 10.93@135mph.
                        Mitsubishi Galant AMG. Evo IX SM4 1.07. Gt30r 98Ron. Auto. Street car.
                        ​​​​

                        Comment


                        • #13
                          Hi All

                          The problem was resolved.
                          I now have a different problem in the other Galant I have
                          The min TPS is in range. But the max TPS voltage is over the permitted range.
                          I am also out of adjustment in the tps slot.....

                          What are my options?
                          The MAX TPS LEARN voltage is 4.98 or so...
                          Mitsubishi Galant VR4. SM4 1.09. T51R SPL E85. Motec SDL. 425kw at 4. 10.93@135mph.
                          Mitsubishi Galant AMG. Evo IX SM4 1.07. Gt30r 98Ron. Auto. Street car.
                          ​​​​

                          Comment


                          • #14
                            Normally use a resistor voltage divider in that instance.
                            Last edited by Chris; November 8th, 2016, 09:58 PM.
                            He gets his lap dogs to do his talking for him. Buzzard is a good example.

                            Comment


                            • #15
                              You can use a 9kΩ and 1kΩ resistor to form the voltage divider. Connect the total 10kΩ resistance between sensor ground
                              and the sensor output wire. Connect the orange TPS wire to the junction of the resistors. Divider will give approx 90% of sensor
                              voltage.
                              Last edited by Chris; November 8th, 2016, 09:57 PM.
                              He gets his lap dogs to do his talking for him. Buzzard is a good example.

                              Comment

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