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  • Bad lifter ?

    The 350 in my Monte is popping on the highway I dont get it around town .Only get it at steady highway speed. Took a look at the plugs and the number 5 is pretty white much whiter than all the rest. I thought it might be ignition so I bypassed the MSD box using a balast resistor for my Mallory dist. got a new coil and new wires and no change. I ran the car with the valve cover off in the driveway and the #5 rocker moves the same as the rest-at idle but again this isnt where the problem is. Should I pull the manifold and change the lifter ? Is there something else I can check? .I cant reproduce the problem with out being on the highway. Thanks for the help.

  • #2

    Re: Bad lifter ?

    hows the timing chain

    Comment


    • #3

      Re: Bad lifter ?

      Fine only maybe 10K on it and the timing stays put.

      Comment


      • #4

        Re: Bad lifter ?

        I had a intermittent miss in my 350 and I changed plugs, wires, distributor, vacuum lines and just about everything else I could think of without fixing the problem which would only happen every once in a while.

        The problem drove me crazy because I could not figure it out.

        An old timer I know said I should had a quart of Marvel Mystery Oil.

        I asked him why and he said it sounds like you might have sticky lifter so I tried it and I have never had the problem again.

        I kept thinking it was something electrical.

        Jimbo

        Comment


        • #5

          Re: Bad lifter ?

          white or whiter? white is a coolant leak replace the intake gaskets (it's actually kind of common on SBCs) - why it would be popping - maybe because it's not completely burning the fuel because of the coolant until it's later in the cycle, and when the MSD second strikes it has enough fuel in it to ignite again? - that's my guess. If that's true, it would pop through the exhaust
          Last edited by SuperBuickGuy; September 15th, 2011, 07:14 AM.
          It only takes one aweshit to erase a dozen attaboys

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          • #6

            Re: Bad lifter ?

            Leaking or burnt intake valve?

            Comment


            • #7

              Re: Bad lifter ?

              Do a compression test? that should show you if you have a valve sealing issue.

              any signs of pressure in the cooling system?

              intake gasket leaking coolant into the intake track is a good idea too.... are you loosing coolant?
              There's always something new to learn.

              Comment


              • #8

                Re: Bad lifter ?

                compression test will just tell you if that cyl will move air. do a leak down test if you think that is the problem

                Comment


                • #9

                  Re: Bad lifter ?

                  Yea - what Jay said!
                  There's always something new to learn.

                  Comment


                  • #10

                    Re: Bad lifter ?

                    I had a intermittent miss in my 350 and I changed plugs, wires, distributor, vacuum lines and just about everything else I could think of without fixing the problem which would only happen every once in a while.

                    The problem drove me crazy because I could not figure it out.

                    An old timer I know said I should had a quart of Marvel Mystery Oil.

                    I asked him why and he said it sounds like you might have sticky lifter so I tried it and I have never had the problem again.

                    I kept thinking it was something electrical.

                    Jimbo
                    the marvel has no quit. love that stuff.
                    even in a sideways everything boxer.
                    I picked up an egr'd bad cammed slob in 24 years runtime (I guessed atomic grtotesque)

                    grabs obvious stuff in minutes, keeping it right in keeps it going into tough places to clean..weeks months.

                    loves the heads.

                    the op has a good start on checking for lifter..
                    Last edited by boxer3main; September 15th, 2011, 11:41 AM.
                    Atomization is excitement, not temperature.

                    Comment


                    • #11

                      Re: Bad lifter ?

                      Im not losing coolant. Nothing out of the exhaust either, nothing seems weird there. Im going to try the marvel mystery oil and keep and eye on the coolant. I was thinking burnt valve too, maybe.
                      Any other suggestions, have at it.

                      Comment


                      • #12

                        Re: Bad lifter ?

                        Sounds like the car is leaning out. If the carb is unchanged before the problem, I suggest checking the vacuum advance. Diaphram may be bad.
                        BS'er formally known as Rebeldryver

                        Resident Instigator

                        sigpic

                        Comment


                        • #13

                          Re: Bad lifter ?

                          I forgot to mention,when i am check that header tube with my ifrared thermometer it is hotter than the others by about 75 deg.

                          Comment


                          • #14

                            Re: Bad lifter ?

                            if it was a miss fire it would be colder I had a lifter blow up on my coupe and found it first by checking header tube temps then did a leak down and I backed the valves off as it would not close( I thought it burned a valve) and it closed the lock poped out and the piston in the lifter cam up and cocked and jamed . but the cyl. with the miss was colder then the ones firing as normal

                            Comment


                            • #15

                              Re: Bad lifter ?

                              A hotter header tube is another sign of a lean condition.
                              BS'er formally known as Rebeldryver

                              Resident Instigator

                              sigpic

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                              • #16

                                Re: Bad lifter ?

                                Im going to check out the vac adv diaphram and take it out tomorrow night and see how it does.Im thinking lean too but because the intake valve isnt opening or opening properly or something .Its only that cylinder and there is no coolant smell or anything, I just took a look. I gave that rocker another 1/4 turn too and added some MM Oil.

                                Comment


                                • #17

                                  Re: Bad lifter ?

                                  A hotter header tube is another sign of a lean condition.
                                  x2

                                  also check to see if the pins the weights ride on are not grooved and holding the weights from free movement..

                                  Comment


                                  • #18

                                    Re: Bad lifter ?

                                    a simple vacuum gauge on the power booster port will tell if its a burnt/leaking valve , a shaky needle is a sign of that.

                                    Comment


                                    • #19

                                      Re: Bad lifter ?

                                      Vac gauge is steady and Vac advance is working . I just had it out and the problem is still there. Just fine when accelerating then level off to speed and it starts popping.

                                      Comment


                                      • #20

                                        Re: Bad lifter ?

                                        Vac gauge is steady and Vac advance is working . I just had it out and the problem is still there. Just fine when accelerating then level off to speed and it starts popping.
                                        how are the advance springs, and the pins the weights ride on, they are known to groove and screw with the mechanical advance

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