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  • Knock!

    So running into some knock... I am runnin a tune that I ran in similar weather and I had no problems


    But I am having issues... And a few times I didn't then soem I did. Hard to say intermittant, but it does work fine.

    I pulled the timing back to about 1* over stock, which is nothing, I used to run 5* fine.




    question is...

    I am running a cutout on the stock catback... but the exhaust has been removed a few times and put back on. If I had a leak is there a chance that my knock may be coming from that? (vibration in exhaust) I do have a rattle in the rear, but that I believe might be suspension related, and shouldn't affect anything.

    Also, running misfire detect, I have seen a few misfires, nothing that is noticeable, but is it possible misfires woudl lead to knock. I am leaning towards ignition system... the wires have like 30k on them, coils ave 66600 miles on them, and plugs have like 3-5k, they should be ok.

    running autolites (605s I believe), one range cooler, recommended alot on the GP boards.




    Any tips on what I should look at first?

  • #2
    Re: Knock!

    come on any help?

    Comment


    • #3
      Re: Knock!

      my car hated auto lights i have to use NGK

      sound like false KR check for anything claning around
      www.turbov6camaro.com
      1997 3800 Series II Camaro
      4600 Stall for my ride to the mall :chug:
      7.18 @ 99.77 1/8 -1.8x sixty (current quickest v6 fbod)
      11.23 @ unk 5 1/4 - 7.19 1/8 - 1.83 sixty

      Comment


      • #4
        Re: Knock!

        that or your rear O2 may be ****ed.

        Comment


        • #5
          Re: Knock!

          I am leaning towards clanging around too... I am thinking possible an exhaust leak, causing a bad vibration.



          The rear o2 will cause knock? how so...


          what if I just unplug it?

          Comment


          • #6
            Re: Knock!

            un plug it and get more knock.

            it causes your trims to be way off, so your car is constantly adding and pulling fuel....aka knock

            Comment


            • #7
              Re: Knock!

              delet the rear O2 codes in the PCM

              but having the coade should not cause any KR since the heard O2's are the ones that control the fuel

              the rear O2 is only there to keep tabs on the cat
              www.turbov6camaro.com
              1997 3800 Series II Camaro
              4600 Stall for my ride to the mall :chug:
              7.18 @ 99.77 1/8 -1.8x sixty (current quickest v6 fbod)
              11.23 @ unk 5 1/4 - 7.19 1/8 - 1.83 sixty

              Comment


              • #8
                Re: Knock!

                BTW send me a log ......... maybe i can help
                www.turbov6camaro.com
                1997 3800 Series II Camaro
                4600 Stall for my ride to the mall :chug:
                7.18 @ 99.77 1/8 -1.8x sixty (current quickest v6 fbod)
                11.23 @ unk 5 1/4 - 7.19 1/8 - 1.83 sixty

                Comment


                • #9
                  Re: Knock!

                  Originally posted by viper04af
                  delet the rear O2 codes in the PCM

                  but having the coade should not cause any KR since the heard O2's are the ones that control the fuel

                  the rear O2 is only there to keep tabs on the cat
                  tht is was wht I was thinking... I thought the rear o2 was pretty much useless... and if it did affect my car, deleting the code would only prevent the SES light from coming on.

                  I am kind of busy this week so I will see if I can get a log or at least dig up an old one.

                  Comment

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