Not firing on 2 Cyclinders?

Discussion in 'Mech Tech' started by sachaigh, Jul 26, 2020.

  1. Hi, wonder if anyone can offer any advice. I've just driven for a couple of hours without any noticable issues, parked up and gone to start it again and now it won't idle and appears to be missfiring.

    I can unplug the leads going to 3 and 4 (I think that's right - the 2 on the left of the engine as you look at it) and it makes no difference to the running. Unplug 1 or 2 and it cuts out.

    There are sparks coming out of all leads.

    What's the next thing to check?

    Thanks for any help!


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  2. davidoft

    davidoft Sponsor

  3. DubCat

    DubCat Sponsor

    Do you have a spare set of spark plugs? If all the leads have a spark, it's possible that two plugs have broken down.
     
  4. Single

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  5. Not with me unfortunately!

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  6. DubCat

    DubCat Sponsor

    You could try swapping the plugs in 1 & 2 with the ones in 3 & 4 and see if the problem moves to the other side, then you'd know to get new plugs?
     
  7. Zed

    Zed Gradually getting grumpier

    Give it some revs and see if the missing cylinders pick up? I expect you've tried that...
     
  8. That's a good shout. Currently waiting for the RAC so got a bit of time on my hands!

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  9. mikedjames

    mikedjames Supporter

    Pop off the rocker cover that side, check that all the valves are moving. I did once leave the nuts a bit loose after doing some work and the rocker assembly loosened off.

    Another thought is to check the rubber boot on the inlet manifold for a big split on the 3/4 side.

    Duct tape will get you going...
     
    Zed likes this.
  10. Seems I'm getting the same effect after swapping, so not sparks

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  11. All looking ok to me, but good advice!

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  12. RAC are here in 10 mins, so let's see what they say. Thanks for the quick responses everyone, I'll let you know what the outcome is!

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    bernjb56 and DubCat like this.
  13. DubCat

    DubCat Sponsor

    Good luck, hopes it's minor.
     
  14. Good luck
     
  15. No compression on 3, we can't see why. Will get it home and have a dig![​IMG]

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  16. Is it a Type 1?
     
  17. davidoft

    davidoft Sponsor

    Pull the rocker cover off on that side

    check valve gears not fallen off

    but cracked head or dodgy valve seat is favourite
     
  18. The garage I usually go to is booked up for the next 6 weeks due to the backlog. I want to go to those guys as they put this engine in and did the last service.

    In the meantime though, I'm going to have a play. Didn't get the chance yesterday.

    Trying to be optimistic as I'm meant to be camping on Saturday!!

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    Little Nellie and Lasty like this.
  19. Buy a Haynes (not the cheeky wag from East Grinstead) and get it grubby ...

    :hattip:
     
    Razzyh and sachaigh like this.
  20. This .

    just in case .. could be just a bolt it back on job

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