Announcement

Collapse
No announcement yet.

Misfire and loud valves/knocking sound

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Misfire and loud valves/knocking sound

    Help! I have adjusted the valves several times on my m20 at the eccentric and the cam. My valve noise is still super loud and it has quite a prominent misfire at idle. I have tried 0.010 and 0.008 clearances and nothing really helps. I have 20w-50 oil and the car has about 212k miles. Not sure if the head has been rebuilt before. I donít want to drive it the way it is but I really donít want to throw parts at it if it can be fixed without any. Any ideas? Also has a knocking sound when you rev the engine. I wish I could post a video but Iím not sure how lol

    #2
    have you checked the timing? i had a loud knocking/ticking from the top end that i couldn't make go away through valve adjustments... turned out the timing jumped 1 tooth forward. sounded like this:

    before valve adjustment:
    https://www.youtube.com/watch?v=H_Sl6fkSWSw

    after:
    https://www.youtube.com/watch?v=-5cjALMo7bg

    Comment


      #3
      Just out of curiosity, are you sure you were using the correct feeler gauge and didnt get the wrong one by accident? I say this as I have a set of feeler gauges that are metric/std and its easy to get them mixed up.

      Comment


        #4
        With that mileage and an unknown history you could easily have worn eccentrics, cam and or rocker faces any or all of which could cause clearance issues.
        Deck Lid and soft top Shocks on hand

        Seat shocks on hand for immediate shipment
        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

        Comment

        Working...
        X