My car jerks

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  • hella 325
    Grease Monkey
    • Sep 2004
    • 380

    #1

    My car jerks

    My car jerks every time the gas is lifeted form completely and then jerks again when you press teh gas. no matter how lightly you do either of these there is still a fairly violent jerk, what causes this? thanks

    Russell
    1987 325is
    1992 240sx coupe
    1994 525i
  • robert325is
    E30 Enthusiast
    • Aug 2004
    • 1171

    #2
    you have a f'ed up throttle. check the throttle body to make sure its all clear
    either that or bad fuel injectors.

    Comment

    • Bill 84 318i
      E30 Mastermind
      • Oct 2003
      • 1600

      #3
      Is it mostly a low RPM thing?

      Comment

      • hella 325
        Grease Monkey
        • Sep 2004
        • 380

        #4
        it gets less as you go up in geat 1st is unbearable 2nd is rough 3rd is noticeable 4th is tolerable 5th its ok

        Russell
        1987 325is
        1992 240sx coupe
        1994 525i

        Comment

        • e30Matt
          R3V Elite
          • Dec 2003
          • 5077

          #5
          Could be anything from slack in the throttle cable to AFM problems to drivetrain problems.

          Can you elaborate a little more on the problem, such as accompanying "clunks" or "thuds"?

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          Comment

          • EverWiser
            Grease Monkey
            • Aug 2004
            • 313

            #6
            Did you or the PO put in a lightened flywheel?...

            Comment

            • dgspikes
              Advanced Member
              • Mar 2004
              • 179

              #7
              i have the same thing, just to a lesser degree. used to only happen in first. now its very noticeable in 2nd also.

              Comment

              • niq_nak
                E30 Addict
                • Apr 2004
                • 422

                #8
                i thought all manual cars did this if u tapped on the gas in low rpms, but i dont know much.

                Comment

                • Bryson
                  E30 Fanatic
                  • Oct 2003
                  • 1490

                  #9
                  is it worse with AC on? ..rear subframe bushings

                  Comment

                  • dgspikes
                    Advanced Member
                    • Mar 2004
                    • 179

                    #10
                    mine is a ton more worse when the ac is on... whats that mean?

                    Comment

                    • Erick
                      Official R3V Drifter
                      • Oct 2003
                      • 11169

                      #11
                      Originally posted by Bryson
                      is it worse with AC on? ..rear subframe bushings
                      I'm sorry but I'm here wondering, how does the AC affect rear subframe bushings?
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                      Comment

                      • NC325iC
                        R3V OG
                        • Mar 2004
                        • 6565

                        #12
                        Originally posted by rwdrift
                        Originally posted by Bryson
                        is it worse with AC on? ..rear subframe bushings
                        I'm sorry but I'm here wondering, how does the AC affect rear subframe bushings?
                        yeah not connected at all
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                        Comment

                        • christophbmw
                          Grease Monkey
                          • Mar 2004
                          • 363

                          #13
                          could it be bad flex disc's? or driveline center support....id check them.
                          '91 318is

                          Comment

                          • hella 325
                            Grease Monkey
                            • Sep 2004
                            • 380

                            #14
                            not suspension might be AFM..... its like the afm doesnt compensate for the closeing of the TB, i should be replacing both soon ill let you know how that works. (replacesing withe big TB and MAF) :twisted:

                            Russell
                            1987 325is
                            1992 240sx coupe
                            1994 525i

                            Comment

                            • 65Matt
                              Advanced Member
                              • Oct 2003
                              • 172

                              #15
                              Hey, what did you ever find out was the problem? My car jerks real bad, too. I replaced the flex disc, center support bearing, and springs and struts. The car doesnt do it as bad now, but still does it.

                              Could I have bad halfshafts, causing alot of play in the drivetrain?

                              Comment

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