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Houston, we have a problem? SOLVED

Discussion in 'Engine & Transmission' started by deeksy62, Mar 7, 2019.

  1. deeksy62

    deeksy62 Well-Known Member

    Messages:
    748
    Location:
    Sawtell
    Hi all, a developing issue with my 1974 Kombi, running an 1800 twin carb motor. Had new heads put on recently, well September last year by Graham at Mid Coast Volks Werks.
    Usually runs OK, but in the last couple of days, it has been having some intermittant issues.
    Driving along, all fine, but then it will only run OK on about 1/3 throttle. The pedal can be pushed all the way to the floor but the engine looses power, the car slows and it all turns to $hi!.
    Even when reved when not under load it will only rev to around 3000 rpm before it starts to break down and fart and backfire though the exhaust.
    It feels as though the motor is being strangled, not a technical car term but that is how it feels.
    All the connections to the shut off valves, choke etc seem to be in the right place.
    The balance tube elbows are ok and the vacuum to the distributor is working.

    When I drive home it starts ok and then it may happen or it may not.

    Thoughts????

    Thanks brains trust.

    Steve
     
  2. Barry

    Barry Well-Known Member

    Messages:
    4,846
    Location:
    Abbotsford NSW
    Any weird noises?
    Assume it is standard points?

    I would be betting one of 2 issues - elect and fuel

    Firstly I would do a full tune up.
    Coil, condenser, points, leads etc etc

    I had a similar issue in a type 1 motor where the coil broke down

    2nd is fuel. Could be blocked fuel filter, rust or a few other things
     
  3. deeksy62

    deeksy62 Well-Known Member

    Messages:
    748
    Location:
    Sawtell
    Thanks Barry, will check these things, a tune up will be organised.

    Steve
     
  4. David H

    David H Well-Known Member

    Messages:
    6,074
    Location:
    newcastle
    My money is on the condenser;) given what you've done so far.
    Cheers
     
  5. 77/kombi/surfer

    77/kombi/surfer Well-Known Member

    Messages:
    1,858
    Location:
    Budgewoi N.S.W. AUSTRALIA
    Good old kombis,
    The same similar thing happened to Dan a mate of mine last week.
    Ended up after we checked/replaced the condensor, coil, distributer cap, leads, checked the spark from coil to the disy , adjusted the timming, check tappet adjustment, check fuel filter for crap.
    It was the old and warn out disy had some how poped out out of the bottom holding bracket an turned 180 deg putting the timming completly out running order.
    So without seeing in person youll have to go through the usual process of elination to work through it but usually its something simple but id check the distributor and spark first.
    Let us no how you go,
    Cheers
     
  6. deeksy62

    deeksy62 Well-Known Member

    Messages:
    748
    Location:
    Sawtell
    thanks David, will check it out
     
  7. deeksy62

    deeksy62 Well-Known Member

    Messages:
    748
    Location:
    Sawtell
    thanks, will need to work on it.
     
  8. KahunaKombi

    KahunaKombi Super Moderator Staff Member

    Messages:
    21,352
    Location:
    Bracken Ridge, Qld
    Check your spark plugs as may be clogged or gaps need resetting or are old and shat themselve(s) ...... if not touched in a while then lash out on a new set of NGK's will set you back about $20.00 ;)
     
    Last edited: Mar 7, 2019
    deeksy62 likes this.
  9. KahunaKombi

    KahunaKombi Super Moderator Staff Member

    Messages:
    21,352
    Location:
    Bracken Ridge, Qld
    Re the dizzy - it could also be the shaft bearing has shat itself causing it to move :eek: and be the issue - new dizzy will fix it if it is.

    Dizzy Condensor hard to diagnose but do have a time limit on them o_O
     
  10. deeksy62

    deeksy62 Well-Known Member

    Messages:
    748
    Location:
    Sawtell
    Sounds like my weekend has now got some jobs for me to do, Kombi wise!
     
    David H likes this.
  11. deeksy62

    deeksy62 Well-Known Member

    Messages:
    748
    Location:
    Sawtell
    Been having a think about this problem, in the past the 'pigtail' wire had become loose, and needed to be resoldered, could this be the issue?

    [​IMG]
     
  12. deeksy62

    deeksy62 Well-Known Member

    Messages:
    748
    Location:
    Sawtell
    A little further investigation found this sitting in the top of the right hand carbi!!!!
    Once removed...........all good

    IMG_2115.jpg
     
  13. KahunaKombi

    KahunaKombi Super Moderator Staff Member

    Messages:
    21,352
    Location:
    Bracken Ridge, Qld
    Who's the Guru :rolleyes: ........... You the Guru :D:cool:;):)

    Well done Steve :rolleyes:
     
  14. Alpal

    Alpal Moderator Staff Member

    Messages:
    8,775
    Location:
    Melbourne Bend of Islands
    What was it? Some sort of plug?
     
  15. tintop

    tintop Well-Known Member

    Messages:
    730
    Location:
    Canberra
    I assume the vacuum hose was taken off previously and blocked off
     
  16. Mr Beckstar

    Mr Beckstar Well-Known Member

    Messages:
    1,117
    Location:
    Bateau Bay, NSW
    It's the warm air thermostat. Check the vacuum hoses under the air cleaner. There should be a hose coming out of there that connects to this thermostat. Without connecting the hose to the thermostat, you'll have an air leak in your central idle circuit. Plus you'll leak unfiltered air into the hole where the thermostat is normally located (under the "pizza slice" air horn feeding the right hand carby) and then into your engine.
     
  17. 77/kombi/surfer

    77/kombi/surfer Well-Known Member

    Messages:
    1,858
    Location:
    Budgewoi N.S.W. AUSTRALIA
    Good find Steve,

    Thought it would of been a disy electric or a fuel issue.

    Happy days driving again...
     
  18. deeksy62

    deeksy62 Well-Known Member

    Messages:
    748
    Location:
    Sawtell

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