Badly adjusted TPS

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  • hashi
    Member
    • Sep 2012
    • 52
    #1

    Badly adjusted TPS

    Hey again. I have been searching for an answer to my problem. i have a 86 325 es with a m20b25 in it. The car seems to be idling much better now but when im driving the car and i let off the throttle completely and then push it back down the car seems to spit or sputter for about a split sec then is fine. This is not the case when i let off the throttle slightly then push back down. Could this be a badly adjusted TPS? i tested the tps and have 0 resistance when the throttle is closed, infinite resistance at 1/3 throttle when neither the idle switch or wide open switch is engaged and 0 resistance at wide open. I thought this was the correct way to have it adjusted? Any one have any ideas feel free to share.
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    • jlevie
      R3V OG
      • Nov 2006
      • 13530
      #2
      It sounds like the TPS is correctly adjusted. The behavior described could be a sticky ICV or from intake leaks. The ICV can be removed and cleaned with carb cleaner and a smoke test will find any intake leaks.
      The car makes it possible, but the driver makes it happen.
      Jim Levie, Huntsville, AL

        Comment

        • hashi
          Member
          • Sep 2012
          • 52
          #3
          Originally posted by jlevie
          It sounds like the TPS is correctly adjusted. The behavior described could be a sticky ICV or from intake leaks. The ICV can be removed and cleaned with carb cleaner and a smoke test will find any intake leaks.
          I cleaned out the Icv so the flap inside moves without any resistance at all. The odd thing is when I unplug the TPS and drive it the idle is rough but doesn't have the sputtering problem I explained above.

            Comment

            • buguhrich
              Advanced Member
              • Nov 2008
              • 141
              #4
              How are you able to drive it at all with the TPS unplugged? I'd imagine it would just buck back and forth due to a lack of fuel.

              And like jlevie said, check for intake leaks with a smoke test.

                Comment

                • hashi
                  Member
                  • Sep 2012
                  • 52
                  #5
                  Originally posted by buguhrich
                  How are you able to drive it at all with the TPS unplugged? I'd imagine it would just buck back and forth due to a lack of fuel.

                  And like jlevie said, check for intake leaks with a smoke test.
                  I can unplug the TPS and start it. The car runs really rough at idle but is fine when given gas but does not do the sputter i explained. I have no idea what the problem is.

                    Comment

                    • jeffnhiscars
                      R3V OG
                      • Jun 2011
                      • 6010
                      #6
                      Originally posted by buguhrich
                      How are you able to drive it at all with the TPS unplugged? I'd imagine it would just buck back and forth due to a lack of fuel.

                      And like jlevie said, check for intake leaks with a smoke test.
                      The ICV becomes inactive once the TPS moves off idle. If its unplugged or defective it should default to full open (and high idle).
                      Seat Shocks....I have passed the baton to John Christy from Ninestitch. Email John or Garrett at ninestitch1@gmail.com

                      https://www.r3vlimited.com/board/sho...86#post4944786
                      Alice the Time Capsule
                      http://www.r3vlimited.com/board/showthread.php?t=360504
                      87 Zinno Cabrio barn find 98k and still smells like a barn. Build thread http://www.r3vlimited.com/board/show...20#post3455220

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                        • hashi
                          Member
                          • Sep 2012
                          • 52
                          #7
                          Originally posted by jeffnhiscars
                          The ICV becomes inactive once the TPS moves off idle. If its unplugged or defective it should default to full open (and high idle).
                          But im still confused of why my problem does not happen when i have the TPS unplugged?

                            Comment

                            • Victor_PR
                              Wrencher
                              • Jun 2011
                              • 296
                              #8
                              Originally posted by jlevie
                              It sounds like the TPS is correctly adjusted. The behavior described could be a sticky ICV or from intake leaks. The ICV can be removed and cleaned with carb cleaner and a smoke test will find any intake leaks.
                              I had a similar problem with my car. The TPS was adjusted but I still experienced the "jerking" when releasing the throttle. It happened to be a faulty AFM. I replaced it and problem was solved.
                              Victor
                              Rides...
                              E30 325i - 1990
                              F30 328i - 2014 (DD)
                              F25 X3 - 2016 (Family car)
                              1974 - 2002 (The ruler of the stable) SOLD

                                Comment

                                • hashi
                                  Member
                                  • Sep 2012
                                  • 52
                                  #9
                                  Originally posted by Victor_PR
                                  I had a similar problem with my car. The TPS was adjusted but I still experienced the "jerking" when releasing the throttle. It happened to be a faulty AFM. I replaced it and problem was solved.
                                  That's exactly what a few friends said to me but this problem does not happen if i unplug the TPS lol idk whats wrong with it haha

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