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crate not firing...thoughts? **UPDATE**

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by txbartman, Jan 24, 2002.

  1. txbartman

    txbartman 1/2 ton status

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    well, we finally got the crate in and everything hooked up last night but she just wouldn't fire. Figure we have the distributor stabbed close enough that it should. No question there is fuel in the carb at least as you can smell it (too much maybe?). We are getting spark because the engine analyzer and timing light both fire. Will crank without really even trying to fire. We are getting spark on both side because at different times we had flames from the headers. Left it sitting overnight in case severaly flooded. Plan to hit it again tomorrow. Any thoughts of things we should check or tips for firing?

    **UPDATE**

    Thanks everyone for the help. SUre enough, it was off 180. Took the cap off and noted the rotor position. Lifted it out, rotated it 180 degrees. Must have nailed it right on because it dropped right back in place! Fired up within a couple of cranks after that. Had timing off enough, though, that fire was coming from the headers as they were turning cherry red. Advanced the timing a bit (BTDC) and it cooled down. Plugged one vaccuum leak and it ran sweet and smooth for the 30 minute cam break-in!

    Only problem, oil was leaving the oil pan gasket as fast as I could pour it in the top! Bad seal from RTV. Kept enough oil in it for the breakin, but lost about 4-5 qts! You know how hard it is to find a cork gasket with left AND right dipsticks!

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!<P ID="edit"><FONT class="small">Edited by tx85gmcguy on 01/24/02 05:29 PM.</FONT></P>
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: crate not firing...thoughts?

    Distributor out by 180 degrees...that would be my guess. Lord knows I've done that about 20 times myself, always the same symptoms too...got fuel, got spark, spins too easy and won't fire...with an occasional backfire through the exhaust.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     
  3. muddin4fun

    muddin4fun 3/4 ton status

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    Re: crate not firing...thoughts?

    I agree with Rene. Sounds like it's 180 off.

    <font color=green>Can't sleep...the clown will get me</font color=green>

    <a target="_blank" href=http://www.bluefox.tv/~lara>My Wonderful Site</a>
     
  4. txbartman

    txbartman 1/2 ton status

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    Re: crate not firing...thoughts?

    So, does that mean I spin the distributor 180 degrees? I don't have the room to do that with the firewall, wires, and all. Should I just swap the wires on the posts? Is there a way I can tell this by checking the position of the valves (w/covers off) and the position of the distributor?

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  5. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Re: crate not firing...thoughts?

    IF the distributor is 180 degrees out. You can pull the distributor, turn the motor 360 degrees and put the distributor back in. The motor rotates 2 times for every distributor (actually rotor) rotation (4 stroke motor). Again this is assuming the distributor is 180 off and not another problem.

    See my rig at <a target="_blank" href=http://coloradok5.com/gallery/Leadfoot> click here </a>
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: crate not firing...thoughts?

    Turn the motor by hand until the mark on the balancer is at the '0' mark. Now pull the cap off the distributor and scribe a mark where the rotor is pointing. Remove the distributor from the motor. With the distributor out rotate the motor one full turn until the '0' mark on the balancer comes up again. Re-install the distributor so your scribed mark is lined up like it was before. Re-install the cap and it should fire up.

    Method two...remove the distributor cap. Note rotor position. remove the distributor hold down bolt, pull up on the distributor so it comes partway out of the motor. Turn the rotor 180 degrees and drop the distributor back down. If you're off by one tooth it will not drop down all the way...make sure it does drop all the way down. If it doesn't drop all the way it means the bottom of the distributor is not engaging the oil pump driver shaft.


    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     
  7. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Re: crate not firing...thoughts?

    Rene,
    I'm glad I'm not the only one who has done this on SEVERAL [​IMG] occasions.

    Brian,
    You can pull the number one plug and the driver's side valve cover. Rotate the engine and feel for the piston coming up and look at the timing mark (**side note, when using an aftermarket balancer, the stock timing marks usually do not line up correctly, you MIGHT need to get an aftermarket timing tab as well**) and watch the valves. As the piston comes up and approaches zero degrees watch the valves, if as you approach zero the exhaust valve closes, rotate past zero, and the intake valve starts to open (past zero) you are 360 out, if not stop and rotate back to zero (most people will tell you not to rotate the engine backwards, but for 15 -20 degrees you will be safe), but if it does, keep rotating the engine until the intake valve closes and the piston comes up and the timing approaches zero again. When it hits zero stop. This should put you at TDC on the ready for combustion and setting the distributor in.

    Hopefully I didn't think back-arswards there. If I did somebody will correct me [​IMG][​IMG].

    See my rig at <a target="_blank" href=http://coloradok5.com/gallery/Leadfoot> click here </a>
     
  8. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Re: crate not firing...thoughts?

    I screw up the distributor every damn time too! I always have it one off and if I keep doing what I have been doing, it usually ends up on the money about the third try.
     
  9. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: crate not firing...thoughts?

    I was once told the definition of insanity was doing something exactly the same way twice and expecting a different result...[​IMG]

    I'm a slow learner I guess...but I'm real good at swapping distibutor's now[​IMG]

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     
  10. txbartman

    txbartman 1/2 ton status

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    Thanks for the help. See main post for update.

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  11. muddin4fun

    muddin4fun 3/4 ton status

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    Can you wait till tomorrow to get a gasket? I can get you a part number on a really good gasket. it's worth it. Its' a one piece gasket instead of having to mess with 4 pieces.

    <font color=green>Can't sleep...the clown will get me</font color=green>

    <a target="_blank" href=http://www.bluefox.tv/~lara>My Wonderful Site</a>
     
  12. txbartman

    txbartman 1/2 ton status

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    I actually already picked up a gasket yesterday. Got it at NAPA. Just hard to find one with right and left hand dipsticks. But they had agood cork one. I'm not messing with the front nd rear seals. They are holding quite well. The front one is so wedged into the aluminum timing cover, it would be a b***** to remove anyway.

    But, to dress the engine up nice, I am going to have to custom make some plug wires, it looks. The replacements I got don't route well around the cruise control vaccuum throttle adjuster. Got it make it all pretty for the mud! I should have some pics up tonight.

    Gotta go custom fab some a/c and p/s brackets to work with the headers!

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     

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