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ROUGH IDLE AFTER WARMING UP

Discussion in '1982-Present GM Diesel' started by ringer, May 28, 2004.

  1. ringer

    ringer Registered Member

    Joined:
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    Hi all,

    New to the forum and new to diesels as well.

    I have a new to me 1985 3/4 ton Chevy Suburban 6.2L diesel 4x4 with a three-speed tranny and NP 208 transfer case. 119,000 miles.

    The truck runs great at first(fires up easily) but as the day wears on, the idle gets rough, so rough I get a bit of shaking in the truck. There is no smoke that I can see either at idle or at speed/acceleration. I also seem to be losing power as the day goes on.

    I have changed the fuel filter. Is it an injector?? I just need some idea on where to start. Thanks in advance!

    Mike
     
  2. Pookster

    Pookster 1/2 ton status

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    Location:
    NYC, NY, USA
    Im still learning about these diesels myself.

    my uneducated guess says that perhaps your not getting fuel delivery anymore-

    How does it run on the highway?
     
  3. doctor4x4

    doctor4x4 1/2 ton status

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    Location:
    Los Angeles
    here are my thought's
    either the lift pump ( my 1st bet )
    or the injector pump
    as the engine gets hotter the rubber seals are letting air in or not pumping properly
    I recomend ya put a in line LOW PRESSURE electric pump in and see if that fixs it ( cheep and easy ) and even f it dont its a great feature to have I.M.O.
    BEST OF LUCK
    &
    WELCOME !!!!!
    R
     
  4. ringer

    ringer Registered Member

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    TY for the responses guys!

    The truck runs ok on the highway, but seems short on power. However, as mentioned, this is my first diesel and I am not sure of how it should feel.

    I do know, it is "missing". In park with a litte fuel, there is a pronounced shudder to the engine that smooths out a bit at higher rpms.
     

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