Need some serious help

Discussion in 'Engine & Performance' started by D150dude, Jun 26, 2019.

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  1. D150dude

    D150dude Member

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    ok, I thought I’d post this here instead of the engine forum. So last week my 81 d150 with the slant six and lean burn started to chug, well the truck was parked from Thursday till this Monday so I took it out and noticed that it was chugging along I took it on the hwy and it wouldn’t go over 70km/hr. I changed the plugs,cap,rotor,fuel pump and filter check the timing and it still won’t go over 50 now, when I floor it it spits and sputters and backfired and even seems like it dies but as I lift my foot off the pedal it sounds fine, what is going on here? I’m pulling my hair out guessing. If anyone needs a video of it running to see what I mean text me at+18078614536 and I’ll send you a video
     
  2. hotrod45

    hotrod45 US Army Veteran Military

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    Sounds like a carburetor issue, as if the high speed jets are at least partially plugged. Will the vehicle speed eventually increase if you go easy on the throttle?
     
  3. D150dude

    D150dude Member

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    Kind of but around 50 she wants to die
     
  4. hotrod45

    hotrod45 US Army Veteran Military

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    Take the air cleaner off. Do not start the engine. Look down into the carburetor and operate the throttle with your hand. See if it is squirting a strong shot of gas into the throat of the carb when you operate the throttle. By the way, never, ever put your face over an open carburetor if the engine is running.
    Your description of the vehicle stumbling and backfiring when you put the gas pedal down is typical of a failure of the accelerator pump, the little mechanism in the carburetor that gives that extra squirt of gas. If the throttle can move any substantial amount before it squirts gas, that's bad. I don't know what is available these days for carburetor repair, but if you can find a rebuilt carb, that is probably the best choice. A "zip kit" to rebuild/clean a carb is probably going to include an accelerator pump, but it will not address what I think is a problem with the high speed jets, or perhaps a port in the casting that goes to the jets. That's why looking for a rebuilt first seems like the better choice.
     
  5. D150dude

    D150dude Member

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    Ok I’m gonna go do that right now, I will keep you informed
     
  6. D150dude

    D150dude Member

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    I went and had a look see and what I saw was when the accelerator is pushed just a little I can see the fuel dribble down inside of the throat of the carb
     
  7. hotrod45

    hotrod45 US Army Veteran Military

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    The accelerator pump should put a forceful stream (think: "squirt gun") into the throat. Less than that = flunks the test. It seems like you might have been cautious. Operate the throttle in a full stroke, from closed to full open in a count of "1."

    Added: if that accelerator pump is operating all right, the next best guess I have is that the fuel is contaminated. Water would be the first normal guess, as long as you can eliminate the chance of kerosene or diesel having gotten into it.
     
    Last edited: Jun 26, 2019
  8. D150dude

    D150dude Member

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    I pulled the fuel fitting out and I also pulled this, it’s in the pic. Looks like that little rubber knob is broke

    0BAFCEE8-C6FE-439F-8AAC-6B7B2241C20D.jpeg

    14473912-B8C1-47FC-B13D-56CC37622937.jpeg
     
  9. Elevated 2013

    Elevated 2013 Senior Member

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    If Hotrod45 isn't right about the carb or the gas (and I don't know that much about carbs and rebuilding them as I only ever rebuilt 2 and I had help) then my next question would be if you still have a cat on the truck? If so, it could be clogged.
     
  10. hotrod45

    hotrod45 US Army Veteran Military

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    That's newer than what I'm used to seeing. Did you take the top off the carburetor?
     

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