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A quiz for all of you!

Discussion in 'T3 & T4 Tech Help Clinic' started by BackintheDak, Apr 12, 2018.

  1. BackintheDak

    BackintheDak Member

    Messages:
    52
    Location:
    Tasmania
    I happily purchased my 83 T3 from a local guy here in the south of Tassie, there was a problem with it not wanting to run all the time. When we test drove it, it ran well but he said he had to turn the dissy to make it so.
    He gave me a receipt from a local garage showing he had spent $360 on new leads, points, tune and have the wiring tidied up.
    I got it home and threw away the silicon leads replacing them with the OEM copper core ones, timed it and it ran. I took it for a drive to the servo to give her a drink and she wouldn't start? fiddled the dissy and she fired up.
    The other clue I can give is the batteries got doughy and needed charging.
    I have found the problem and never looked back.
    Any ideas?
     
    Last edited: Apr 12, 2018
  2. cbus

    cbus Well-Known Member

    Messages:
    13,570
    Location:
    sunshine coast
    So what did you touch on the dissy ?
    Most likely is you have a point of resistance somewhere and the doughy battery combined with resistance equals too much voltage drop.
    Usualy bad earth or connections.
     
    Syncro27 likes this.
  3. BackintheDak

    BackintheDak Member

    Messages:
    52
    Location:
    Tasmania
    Close very close,!!
    I had to advance the timing to get it to start again, I also replaced the condenser but still had a weak red spark at the points.
     
  4. cbus

    cbus Well-Known Member

    Messages:
    13,570
    Location:
    sunshine coast
    Closed points?
    Coil.
    Stuffed locating into case.
    No earth braid on advance plate?
     
  5. BackintheDak

    BackintheDak Member

    Messages:
    52
    Location:
    Tasmania
    No, points were sparking but very weak red spark.
    Give up yet?
     
  6. cbus

    cbus Well-Known Member

    Messages:
    13,570
    Location:
    sunshine coast
    Never. :)

    Weak spark would indicate issue with coil, lack of dwell, a lack of voltage delivered to coil, poor circuit somewhere in low or high voltage .
    New condenser faulty?

    Is fiddling with dissy relevent?

    Has coil got hot?

    Have fixed a beetle that constantly blew fuses.
    Genius had screwed a spare cable from ign to fan housing.
    Can't have loose wires ;)
     
  7. syncro

    syncro Well-Known Member

    Messages:
    10,371
    Location:
    Southern Highlands
    That was my #1 guess.

    Now what did you fiddle with?
     
  8. BackintheDak

    BackintheDak Member

    Messages:
    52
    Location:
    Tasmania
    I replaced the leads, I replaced the condenser. The points and dissy cap were fine.
    I don't think the coil ever got hot, relatively new coil.
    I had to advance the dissy timing when it stalled at the garage to get it to start.

    No loose wires but very very close!
     
  9. BackintheDak

    BackintheDak Member

    Messages:
    52
    Location:
    Tasmania
    Want another clue!!!!
     
  10. KahunaKombi

    KahunaKombi Super Moderator Staff Member

    Messages:
    22,284
    Location:
    Bracken Ridge, Qld
    Sounds like an issue I had with a dizzy in my 1973 Kombi - the bearing(s) in the shaft of the dizzy were screwed and so movement in the shaft meant no go under circumstances similar to what you are saying ..... new dizzy and added electronic ignition pack and purred after that.
     
  11. KahunaKombi

    KahunaKombi Super Moderator Staff Member

    Messages:
    22,284
    Location:
    Bracken Ridge, Qld
    Doesn't sound like dizzy put in wrong ...... but then :oops::rolleyes::eek:
     
  12. BackintheDak

    BackintheDak Member

    Messages:
    52
    Location:
    Tasmania
    No dissy in fine, no excessive wear ect.
    Points gap was fine, really weak red spark
     
  13. syncro

    syncro Well-Known Member

    Messages:
    10,371
    Location:
    Southern Highlands
    Coil connected wrong?
     
    cbus likes this.
  14. BackintheDak

    BackintheDak Member

    Messages:
    52
    Location:
    Tasmania
    YOU HAVE IT!!! SYNCRO
     
  15. BackintheDak

    BackintheDak Member

    Messages:
    52
    Location:
    Tasmania
    Points to positive on coil, positives to negative side
     
    hairyman likes this.
  16. syncro

    syncro Well-Known Member

    Messages:
    10,371
    Location:
    Southern Highlands
    Who said that two heads are better than one.;)
     
  17. cbus

    cbus Well-Known Member

    Messages:
    13,570
    Location:
    sunshine coast
    Ha.
    New one on me::D

    Once again demonstrates the frailty if diagnosing on forum as I would have run a check on that.
    Same came up at bus stop where some chatter re issues with kombis heading up and seeing in the flesh revealed extra significant issues.

    But also another example of people spending money to fix problems and the basics haven't been sorted properly.

    Wondering why the extra advance assisted.
    Maybe to ensure time for combustion with weak spark?

    A similar thing with LPG.
    Plug gaps are smaller to give easier initiation of spark.
    Extra advance is also beneficial at lower revs due to characteristic of combustion.
    ( the advance is limited at top end tho ,also because of changes in burn at higher revs.)

    Is the loss of spark due to an earth still existing via body of dissy affecting relevent winding?
    Ie field not fully built up?
     
    Kombi Kapers likes this.
  18. syncro

    syncro Well-Known Member

    Messages:
    10,371
    Location:
    Southern Highlands
    That's because the resistance of LPG/air is higher than petrol/air. It needs more spark to travel the same distance. It's also why you burn out coils/distributor caps/connectors.
     
    cbus likes this.
  19. syncro

    syncro Well-Known Member

    Messages:
    10,371
    Location:
    Southern Highlands
    Less spark because the primary and secondary windings are swapped. A coil is just a transformer.
     
  20. BackintheDak

    BackintheDak Member

    Messages:
    52
    Location:
    Tasmania
    Yeh sadly the guy I purchased it off produced the receipt dated 3 weeks prior showing the work the local garage had done. He took it back but they said they couldn't help him.
     

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