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Timing issues...

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by reddog64, Dec 7, 2002.

  1. reddog64

    reddog64 1/2 ton status

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    OK for the life of me I cannot get it to time correctly...
    Seems when I time it to 8 BTDC it almost dies, tthen at 8 BTDC if i give it gas and let go it dies... so i up the idle and it does the same thing.. if I back it off any, the timing it is way off the mark, and wants to diesel... if i adjust it, timing and idle, so it seems good it has NO POWER whatsoever...

    WTF... /forums/images/graemlins/angryfire.gif
     
  2. Doug M

    Doug M Registered Member

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    Stock 350? What has happened that has caused you to adjust the timing? And, are you setting initial with vac advance disconnected and plugged?
     
  3. reddog64

    reddog64 1/2 ton status

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    i did set it initially with the vac advance disc and plugged.. set at 8 btdc.... and it runs like CRAP and doesnt stay running.....

    When I put it in gear, give it gas, and let off.. it dies....

    HELP!!!! /forums/images/graemlins/1zhelp.gif
     
  4. Shaggy

    Shaggy 3/4 ton status

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    <font color="green"> I'd use a piston stop to verify that the timing tab is at the right place. ALso, the outside ring can slip on harmonic dampers, mine turned about 45 degrees so now the mark is waaay off.</font color>
     
  5. reddog64

    reddog64 1/2 ton status

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    so should I just tune it to ear...

    but why no power and hesitation when in gear and trying to go forward/backward....

    it revs in park/neutral just fine...

    /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/ears.gif
     
  6. 87sm465np208

    87sm465np208 1/2 ton status

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    when you put yur truck in D or R, you are putting a load on it. so it could be somthing with vacuum or a carb setting.


    /forums/images/graemlins/usaflag.gif /forums/images/graemlins/truck.gif
     
  7. reddog64

    reddog64 1/2 ton status

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    hmmm how do i check my vac advance?
     
  8. Doug M

    Doug M Registered Member

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    Accurately check vacuum advance with a dial back advance timing light. Jegs has the best price I've seen so far on one. To guesstimate, hook up the vac hose and see where the mark moves. Factors are whether you have manifold vac or ported. Some cannisters (most) have 20-22 degrees while others provide 10-12.
    You could also be due for some carb maintenance. Blown power piston or bad accelerator pump.
     
  9. reddog64

    reddog64 1/2 ton status

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    hmmm...
    I'm gonna pull the carb apart and see if anythign is hanging around in it....


    It idles and revs in neutral awsome.. but not in gear.. it just dies off.... or chokes on deacceleration...


    ??? /forums/images/graemlins/1zhelp.gif
     
  10. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Try advancing your timing a bit. If drivability improves but no pinging advance it more. When you get a little pinging under partial throttle back it off a hair. That is the sweet spot.

    With the timing too retarded it will idle and rev fine because there isn't any load. When the timing is bang on it should barely drop in idle speed between nuetral and drive.

    rene
     
  11. reddog64

    reddog64 1/2 ton status

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    Thanks Rene, I'll go try that...

    I'm starting to get frustrated with it...

    And want to play with my welder dangit!!!

    No one that sells gas is open on a sunday!!!
     
  12. reddog64

    reddog64 1/2 ton status

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    hey Rene....

    That was it...

    Much better...

    Still Needs to be dialed in though... /forums/images/graemlins/eek.gif
     
  13. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Keep playing with it...as soon as it pings a little back it off a hair.

    Rene
     
  14. reddog64

    reddog64 1/2 ton status

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    which way is it you turn it to make it run too hot... I know there's a certain way to turn (adv or retrd) that it will run hot, temp wise.... not that I want it to but I want to avoid it...
     
  15. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Usually too retarded will run hot because the exhaust is opening as the mixture is still firing...mostl it'll just be a dog and backfire through the carb though. Too advanced and it'll crank hard when starting...

    Rene
     
  16. reddog64

    reddog64 1/2 ton status

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    cool I'll remember that! /forums/images/graemlins/cool.gif
     
  17. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Rene, or others
    Assuming carb settings and jetting is correct, what would cause it to "diesel" at shutoff? I'm assuming a retarded condition will do this as it causes exhaust valve temps to increase, but not sure. I just threw my motor back in on Sunday (after removing it to replace the x-member), and really didn't get a chance to adjust the timing (no mark on balancer and no timing tab..... /forums/images/graemlins/confused.gif). I noticed that it will diesel after a good run and shutoff. It did not do it before, and I did not touch anything else, so I am assuming that I put the distributor back in a few degrees off. Any thoughts?
     

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