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Husqvarna 455 Rancher idle problem

Discussion in 'Chainsaw' started by rch416, Jan 10, 2014.

  1. rch416

    rch416 ArboristSite Lurker

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    Hey everybody, I've got a 455 rancher that runs and cuts fine but when it's warmed up it will idle for 10 secs or so then rpm's start climbing (like it's running out of fuel) then it dies. I put a new carb kit in it since the diaphragm was a little stiff but not to terribly bad, but still same problem. I put a new fuel line on thinking it had a pin hole in it somewhere but still same problem. So I started thinking this is an air problem vs fuel problem. I've checked all gaskets and mating surfaces even made a couple gaskets to got in between the filter holder and the carb. I've even sprayed a little starting fluid around all mating points, the motor does die but it acts like it floods it out. I'm stumped on this one. Any and all help is greatly appreciated.
     
  2. fuzz1500

    fuzz1500 Guest

    It does sound like an air leak of some sort to me.........but as far as that..Im of no help . Never worked on that saw .
     
  3. hamish

    hamish Addicted to ArboristSite

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    How is your throttle response? Condition of fuel filter? Does fuel tank get pressureized?
     
  4. rch416

    rch416 ArboristSite Lurker

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    Throttle response is good but when the engine warms up you have to pump the throttle to get it to rev up, if that makes any sense. The fuel filter is new, as I installed it thinking this might be part of the problem. The tank is not getting pressurized that i can tell.
     
  5. Ozhoo

    Ozhoo ArboristSite Operative

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    Are you savvy with videos, youtube that sort of thing? They really make it easier to "remote troubleshoot".

    That said, it sounds like it's low on compression, have you checked it or taken a gander at the piston?
     
  6. rch416

    rch416 ArboristSite Lurker

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    Ask and you shall receive :)
     
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  7. Ozhoo

    Ozhoo ArboristSite Operative

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    What we have here is what I like to call a "mystery" and the key to every mystery is to start at the beginning.

    Have you adjusted the low side carb setting? How does it react when you lean it out?
     
  8. rch416

    rch416 ArboristSite Lurker

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    When I lean it out it acts as it should, higher rpm's but it does eventually die. I'm not sure if this is from being to lean or the problem I'm trying to diagnose. Whatever the problem it's only at an idle or at least that what it seems like cause I can run half-full throttle all day long with no problems.
     
  9. Ozhoo

    Ozhoo ArboristSite Operative

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    It appears to be "loading up", meaning that it's running to rich on the low side. Give the L screw a 1/4 turn CW and see how it responds.
     
  10. rch416

    rch416 ArboristSite Lurker

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    Well I tried the adjusting the low speed jet and nothing. Still the same problem. So I tried blowing through the fuel tank vent but couldn't, isn't air supposed to beable to go from the outside in? Now I'm curious to if this is part or all of the problem.
     

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