Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

truck keeps running?

Discussion in 'The Garage' started by jeff l, Oct 23, 2006.

  1. jeff l

    jeff l 1/2 ton status

    Joined:
    Jun 13, 2006
    Posts:
    104
    Likes Received:
    0
    Location:
    New Orleans
    after i turn it off. Its a 79 rebuilt 350 w/600 cfm eld/carb.
    one person said that i have it idled to high. just wanted a 2nd opinoin
    thanks
     
  2. obijuan

    obijuan 1/2 ton status GMOTM Winner

    Joined:
    May 18, 2006
    Posts:
    4,009
    Likes Received:
    0
    Location:
    San Antonio TX
    i think its called deiseling, it could be a few things like timing and idle speed. check those.
     
  3. 73k5blazer

    73k5blazer Unplug the matrix cable from the back of your head Premium Member

    Joined:
    Dec 28, 2001
    Posts:
    4,987
    Likes Received:
    38
    Location:
    The Rustbelt
    Some vehicles were equipped from the factory with what they called an "Idle stop solenoid".
    You can get them at the auto parts store. If worst comes to worst, you can installl one of them. I believe holley sells a bracket just for it too.

    But, yeah, check your timing, idle speed, choke setting...etc.
     
  4. matneyr

    matneyr Registered Member

    Joined:
    Jun 25, 2005
    Posts:
    20
    Likes Received:
    0
    Location:
    Blacksburg, Virginia
    I have a '85 Suburban that is notorious for dieseling. I've tried everything to make it stop, including timing, plugs, idle speed, choke -- it still does it. It's worse the closer to sea level you get.
     
  5. pauly383

    pauly383 Daddy383 Staff Member Moderator

    Joined:
    Jul 22, 2001
    Posts:
    16,217
    Likes Received:
    1
    Location:
    Mesa , Arizona USA
    Weather makes a difference . But for the most part idle speed . I have a Q-jet and an auto trans , I idle at 500-550 in gear , 600-650 at idle , and once in awhile it still does it .
     
  6. xpndbl3

    xpndbl3 1/2 ton status

    Joined:
    Jul 30, 2005
    Posts:
    510
    Likes Received:
    0
    Location:
    orland park, IL
    if you want to prevent dieseling then shut it off in gear and then put it in park afterwards.
     
  7. jeff l

    jeff l 1/2 ton status

    Joined:
    Jun 13, 2006
    Posts:
    104
    Likes Received:
    0
    Location:
    New Orleans
    thanks for all the replies. I feel better about what direction to go to fix the problem. also thanks for the kill it in gear tip. I will do that, till the week end when i get to work on it.
     
  8. 1977k5

    1977k5 3/4 ton status Vendor

    Joined:
    May 26, 2003
    Posts:
    9,992
    Likes Received:
    130
    Carbon buildup can cause dieseling as well. Seafoam is the fix for that.
     
  9. ftcjimmy

    ftcjimmy Registered Member

    Joined:
    Mar 9, 2005
    Posts:
    61
    Likes Received:
    0
    Location:
    ct
    It is because theres carbon build up, the carbon gets hot spots wich ignites the compressed gasses. Also maybe you used some bad gas?
     
  10. matneyr

    matneyr Registered Member

    Joined:
    Jun 25, 2005
    Posts:
    20
    Likes Received:
    0
    Location:
    Blacksburg, Virginia
    Well, the stopping while in gear thing works -- but my truck doesen't diesel every time I turn off the engine, only occasionally.
     
  11. 02turbogixxer

    02turbogixxer Registered Member

    Joined:
    Aug 1, 2006
    Posts:
    63
    Likes Received:
    0
    Location:
    Dallas, TX
    I've tried that and it doesn't always work.
     
  12. 1977k5

    1977k5 3/4 ton status Vendor

    Joined:
    May 26, 2003
    Posts:
    9,992
    Likes Received:
    130
    That is a cover for a slightly bigger problem. Leaving the truck in gear (or in park) is not the solution to a dieseling problem.
     
  13. 4x4_76

    4x4_76 1/2 ton status

    Joined:
    Jul 22, 2001
    Posts:
    628
    Likes Received:
    0
    Location:
    Ylämaa, Finland
    My uncle once told that if the engine is dieseling, it can be cured by spraying water to intake. First take off the aircleaner, then use spraybottle (one that is used to spray flowers), keep rpm's between 1500-2000 and lightly spray water to carb. It sounds nasty, but works.

    edit/ That is, when carbon build-up is causing dieseling.
     
  14. BURBicon

    BURBicon Registered Member

    Joined:
    Dec 11, 2004
    Posts:
    78
    Likes Received:
    0
    Location:
    Sunny Phoenix
    I've been doing the "shut it off in drive" deal for years. I'm not even sure if my truck diesels any more.

    NOTE TO SELF: Put tranny in park just to see if truck diesels next time I shut it off.
     
  15. SchnorrCS

    SchnorrCS 1/2 ton status

    Joined:
    Oct 11, 2005
    Posts:
    368
    Likes Received:
    0
    Location:
    Loveland, CO
    Dieseling can be caused by alot of junk. High coolant temp is one cause I've heard and not seen mentioned yet.

    My truck does it if I put crappy gas in it. I hold the brake and turn it off. Don't know why, but it seems to work. Maybe it's just the thought of trying to do something that makes it seem to work...I don't know.
     
  16. MattK

    MattK 1/2 ton status

    Joined:
    Jan 12, 2005
    Posts:
    1,713
    Likes Received:
    0
    Location:
    Dallas, TX
    i used to have an 85 blazer that dieseled after shutoff when the engine was good and warm. seafoam cured this problem. it also idled A TON smoother and quieter.
     

Share This Page