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  • 98 3.8 Vibration in park and drive with foot on brake

    Firebird 98 3.8 v6 auto Car vibrates the dash apart when at a stop light with my foot on the brake. Shift into neutral, foot on brake, still vibrates. Foot on brake and rev up to 1000rpms and the vibration disappears. The rpms dont bounce when its vibrating. Sometimes the vibration feels like a pulsating. Still you would think the RPMS would pulse but they dont. Theres no vibration during driving, just while stopped. When I shift into different gears, the vibration lets up while it shifts and then starts again.

    Coil packs and ECM plugs and wires are all brand new.
    Motormounts and trans mount are new.

    ideas?

  • #2
    Re: 98 3.8 Vibration in park and drive with foot on brake

    Vacuum leak maybe.
    08' L76 6.0L 4X4 Chevy EXT.Cab LTZ Vortec MAX with Snug top cover, Dynomax exhaust,Hptuners& K&N intake
    96' Camaro M5 to A4 conversion, alot of mods ,see Homepage. GT35R Turbo http://www.cardomain.com/ride/244123...vrolet-camaro/
    https://www.facebook.com/steve.starcher.18

    Comment


    • #3
      Can you take a video or anything?
      Wait, Is that a V6 or V8?
      1990 Chevrolet C-K 1500 series 4.3L .. 5spd
      1994 JDM Euno Roadster 1.8L 5spd Bolt Ons.. etc
      2000 Camaro 3.8L Auto Bolt Ons..etc

      Comment


      • #4
        Re: 98 3.8 Vibration in park and drive with foot on brake

        I dunno that a video would show vibration. The RPMS dont move unless I shift the trans or rev on the gas so that makes me think its not an idle problem. Im not throwing any codes. its just wildly annoying. It vibrates the seats and change in my ashtray.
        What kind of vacuum leak? EGR?

        Comment


        • #5
          Re: 98 3.8 Vibration in park and drive with foot on brake

          Might check the condition of the rubber on the harmonic balancer.

          Comment


          • #6
            Re: 98 3.8 Vibration in park and drive with foot on brake

            i have the same prob . idk what it is so i just drive like that i do throw a code tho for mr my bank 2 sensor isnt operating righ for some reason.

            Comment


            • #7
              Re: 98 3.8 Vibration in park and drive with foot on brake

              Originally posted by techsan23 View Post
              Might check the condition of the rubber on the harmonic balancer.
              X2 I forgot about that, mine was pretty bad when it went out.
              08' L76 6.0L 4X4 Chevy EXT.Cab LTZ Vortec MAX with Snug top cover, Dynomax exhaust,Hptuners& K&N intake
              96' Camaro M5 to A4 conversion, alot of mods ,see Homepage. GT35R Turbo http://www.cardomain.com/ride/244123...vrolet-camaro/
              https://www.facebook.com/steve.starcher.18

              Comment


              • #8
                Re: 98 3.8 Vibration in park and drive with foot on brake

                i just got done cleaning my throtle body like 2 hours ago. and it some what stoped , also it only starts when i drive alot and the engine starts to operate at 210 temp.

                Comment


                • #9
                  Re: 98 3.8 Vibration in park and drive with foot on brake

                  Originally posted by FIREBIRDV6RAGE View Post
                  i just got done cleaning my throtle body like 2 hours ago. and it some what stoped , also it only starts when i drive alot and the engine starts to operate at 210 temp.
                  Mines different. It will vibrate with the engine cold or hot. Doesn't change w engine temp or length of operation. I forgot to say I did an L26 swap n left the L26 balancer on. Could that be the source?

                  Comment


                  • #10
                    Re: 98 3.8 Vibration in park and drive with foot on brake

                    Originally posted by Ratchet View Post
                    Mines different. It will vibrate with the engine cold or hot. Doesn't change w engine temp or length of operation. I forgot to say I did an L26 swap n left the L26 balancer on. Could that be the source?
                    Did you do a case relearn with the L26 balancer?
                    08' L76 6.0L 4X4 Chevy EXT.Cab LTZ Vortec MAX with Snug top cover, Dynomax exhaust,Hptuners& K&N intake
                    96' Camaro M5 to A4 conversion, alot of mods ,see Homepage. GT35R Turbo http://www.cardomain.com/ride/244123...vrolet-camaro/
                    https://www.facebook.com/steve.starcher.18

                    Comment


                    • #11
                      Re: 98 3.8 Vibration in park and drive with foot on brake

                      Originally posted by ssms5411 View Post
                      Did you do a case relearn with the L26 balancer?
                      No didnt do a case relearn Ill call and see how much that costs at the dealer.. Could it be the torque converter? Maybe i need to rotate it on the flexplate? I didnt mark them when I took them apart, so maybe they are off balance?
                      Last edited by Ratchet; 11-03-2012, 01:58 PM.

                      Comment


                      • #12
                        Re: 98 3.8 Vibration in park and drive with foot on brake

                        maybe its your tires. JK
                        I dont think the flexplate and TC can be installed incorrectly. does the harmonic balancer shake\wobble when the motor is running? did this start immediately after your l26 swap. i dont believe the CASE learn will be beneficial. in my experience, when a case learn is needed. it will either give you a legitimate misfire. that would leave a code. or not physically effect the way it runs but still give you a code. p0300 multiple cylinder misfire.... my experience with case learns is only with s10's though.

                        Comment


                        • #13
                          Re: 98 3.8 Vibration in park and drive with foot on brake

                          Originally posted by thebeewantsboost View Post
                          maybe its your tires. JK
                          I dont think the flexplate and TC can be installed incorrectly. does the harmonic balancer shake\wobble when the motor is running? did this start immediately after your l26 swap. i dont believe the CASE learn will be beneficial. in my experience, when a case learn is needed. it will either give you a legitimate misfire. that would leave a code. or not physically effect the way it runs but still give you a code. p0300 multiple cylinder misfire.... my experience with case learns is only with s10's though.
                          its not my tires. it smoothes out at 1000rpms. If I sit in park and put my foot on the gas and get the rpms past 1000 it stops vibrating. It started right after the swap and has gotten worse. Ive noticed when sitting on an incline its worse. The balancer shows no movement when looking at it while running.

                          Comment


                          • #14
                            Re: 98 3.8 Vibration in park and drive with foot on brake

                            My car is still vibrating like crazy. Here is everything i have fixed since this thread was started.
                            New Harmonic balancer (98-02 balancer)
                            New Transmission mount
                            New Plugs and wires
                            New Fuel filter
                            Rotated the flexplate to see if that changed the vibration didnt help.
                            Also inspected the flexplate for stretched bolt holes. They are fine.
                            Took the serpentine belt off and it didnt change the vibration.
                            Checked the exhaust and its not touching the body.
                            Car has new motor mounts, motor doesnt move under acceleration. Mounts have been double checked to be tight and bolted down correctly.
                            Car vibrates no matter what gear its in.
                            Car does NOT vibrate while going down the road.
                            Only vibrates at a stop with the foot on the brake or at a stop in park. If i rev the engine in park/Drive at a stop over 1000k the vibration goes away.
                            Im at wits end with this thing. I drive it 100miles daily to work so it isnt hurting the reliability, its just annoying and embarassing to be vibrating at every light and stop sign.
                            I jacked it up lastnight and started it and when i put my hand on the transmission pan you can feel the vibration, but its stronger on the engine oil pan. I even took the dust cover off the flexplate and watched it spin and its not wobbling.
                            Im not getting codes or and SES light. This has me stumped.

                            Next things to check are fuel injectors and cat converter. Any other ideas guys??
                            Last edited by Ratchet; 08-05-2013, 10:58 AM.

                            Comment


                            • #15
                              Re: 98 3.8 Vibration in park and drive with foot on brake

                              Again, did you do a case relearn on it?
                              08' L76 6.0L 4X4 Chevy EXT.Cab LTZ Vortec MAX with Snug top cover, Dynomax exhaust,Hptuners& K&N intake
                              96' Camaro M5 to A4 conversion, alot of mods ,see Homepage. GT35R Turbo http://www.cardomain.com/ride/244123...vrolet-camaro/
                              https://www.facebook.com/steve.starcher.18

                              Comment

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