318 hesitation

Discussion in 'Trucks and Trailers' started by zak406, Jul 28, 2008.

  1. zak406

    zak406 LawnSite Bronze Member
    Posts: 1,519

    i have a 1985 power ram 150 which is in perfect condition but all of a sudden im having a bad hesitation and bogs when givin gas in the engine(318 carbuerator) does any one know what it could be????
     
  2. zak406

    zak406 LawnSite Bronze Member
    Posts: 1,519

    we checked the plugs and changed the aircleaner still nothing any suggestions???
     
  3. Accu-cut Lawn Care

    Accu-cut Lawn Care LawnSite Bronze Member
    Posts: 1,206

    It may be the cat... or something as simple as a fuel filter or pump. Check your fuel pressure at the rail.
     
  4. Valk

    Valk LawnSite Silver Member
    Posts: 2,711

    Does your carb have an accelerator pump diaphragm? While I'm not necessarily suggesting you rebuild your carb......the primary symptom of these failing is hesitation during initial acceleration.

    .02 // YMMV
     
  5. zak406

    zak406 LawnSite Bronze Member
    Posts: 1,519

    thanks for the reply the fuel pump filter and distributer cap were all replaced still having the same problem
     
  6. A Leaf Above

    A Leaf Above LawnSite Member
    Posts: 223


    I 2nd this diagnosis ..usually on Carbs the accelerator pump is the problem ..
     
  7. zak406

    zak406 LawnSite Bronze Member
    Posts: 1,519

    tried rebuilding carb still not running rihgt next up is the cat.
     
  8. lawnboy dan

    lawnboy dan LawnSite Gold Member
    Posts: 3,712

    ditch it and get something with fuel injection. by 85 both ford and gm had it.
     
  9. slplow

    slplow LawnSite Senior Member
    Posts: 354

    It sound like , some one for got to hook up a vacuum line up or vacuum leak. Check the line to the distributer .
     
  10. topsites

    topsites LawnSite Fanatic
    Posts: 21,654

    Around here I don't "check" no plugs :p
    I replace mine every 20,000 miles, that's double platinums, standard plugs would be every 10,000.

    So if I go through the trouble of pulling one then the whole lot gets replaced,
    and if that doesn't fix it then the wires and cap and rotor are next.

    On that note you probably just need a new cap and rotor, but...
     

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