Toyota hilux backfire on acceleration

Discussion in 'Maintenance/Repair' started by Prestin settle, May 11, 2015.

  1. Prestin settle

    Prestin settle Newbie

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    Truck:
    2wd 1975 chinook chopped
    So this is the problem I'm having at the moment. Truck runs great (20r) Until I get to about 3/4 throttle, then it dose this sputter backfire type thing. Dose anyone have any suggestions. 1977 2wd Toyota hilux. Bought it a month ago :shrug:
     
  2. White Trash

    White Trash Toyotaholic

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    Sounds like the timing may be too fast so when the mechanical advance kicks in it backfires. Or there is a clogged main jet so it goes lean when on the secondary circuit.


    I'm in pasco but I'm out till Thursday. When I'm back home I'll check it out for you if you haven't figured it out yet.
     
  3. Prestin settle

    Prestin settle Newbie

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    I'm new to the whole carbureted seen at least on a truck, I'll do some trubble shooting, change spark plugs, check the dizzy cap and that stuff but if you could help me out on when you get back that would be greatly appreciated!!! :bow:
     
  4. jetas

    jetas Grand Toyotaholic

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    Start off with the timing. Easy to check. Dont start throwing parts at it if it youre not sure thats the problem
     
  5. Prestin settle

    Prestin settle Newbie

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    It happened out of no where the truck ran fine then it started doing this last week have owned it for a month and a half
     
  6. aaron_sk

    aaron_sk Enthusiast

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    Sounds to me like the secondary is not opening, or possibly clogged jet as was mentioned earlier.
     
  7. tyrap26

    tyrap26 Enthusiast

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    ^ this is my opinion as well .. but like the other boys said, double check timming
     
  8. Prestin settle

    Prestin settle Newbie

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    Thank you all of you it was the timing issue, and big shout out to white trash for the help and information and distributor
     
  9. White Trash

    White Trash Toyotaholic

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    Truck didn't sound wonderful when you drove away so I figure you must have tinkered with it a bit and got it dialed in?
     
  10. Prestin settle

    Prestin settle Newbie

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    Yea was still running rough but I knew it was timing so instead of using the fine tune point we were messing with I just loosened the distributor and swissted it till it was close to perfect now it runs like a champ again:clapping:
     

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