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.

Problems after Mods

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by magnum4x4, Dec 14, 2004.

  1. magnum4x4

    magnum4x4 Registered Member

    Joined:
    Jan 4, 2004
    Posts:
    97
    Likes Received:
    0
    Location:
    Baltimore, MD
    I installed a new alum. intake, headers and the holley truck avenger. Now my truck won't start. It is back firing through the carb. I figure it is something with my timing . I started at top dead center at the #1 piston and saw which wire it was pointing to and ran my wires frome there. 1863......

    It is still doing it. Is it possible I have the distributor cocked a little. Where should my #1 wire on the distributor be pointing 6:00 or 5:30. Should I lift the distrib. out completely and reinstall it at 6:00. Please help winter is coming fast.
     
  2. 75-K5

    75-K5 3/4 ton status

    Joined:
    Apr 28, 2002
    Posts:
    5,353
    Likes Received:
    0
    Location:
    Anderson, Indiana
    Did you mess with the dist. at all when doing these mods? If not it might have something to do with the carb, possibly it is messed up out of the box.
     
  3. Hossbaby50

    Hossbaby50 3/4 ton status

    Joined:
    Sep 1, 2001
    Posts:
    8,972
    Likes Received:
    0
    Location:
    Peoria, AZ
    It sounds like your distributor is 180* off.

    Harley
     
  4. pauly383

    pauly383 Daddy383 Staff Member Moderator

    Joined:
    Jul 22, 2001
    Posts:
    16,217
    Likes Received:
    1
    Location:
    Mesa , Arizona USA
    1863..........

    No , the firing order is matter of factly 1-8-4-3-6-5-7-2
     
  5. 85mudblazin

    85mudblazin 1/2 ton status

    Joined:
    Mar 26, 2004
    Posts:
    3,951
    Likes Received:
    0
    Location:
    Austin,TX
    my vote is the distibutor is out 180*also
     
  6. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

    Joined:
    Aug 28, 2002
    Posts:
    9,097
    Likes Received:
    144
    Location:
    california
    I caught that too. ;)
     
  7. scrappyk5

    scrappyk5 1/2 ton status

    Joined:
    Mar 17, 2002
    Posts:
    2,099
    Likes Received:
    0
    Location:
    virginia
    i vote the dist. is out of wack. :D
     
  8. crazy427

    crazy427 1/2 ton status

    Joined:
    Mar 10, 2003
    Posts:
    979
    Likes Received:
    0
    Location:
    Edison , NJ
    Distributor 180 out and timing out of order
     
  9. rubbinz raczn

    rubbinz raczn 1/2 ton status

    Joined:
    Oct 4, 2004
    Posts:
    656
    Likes Received:
    0
    Location:
    too far north!
    firing order! one wire wrong will make it backfire.
     
  10. highlow

    highlow 1/2 ton status

    Joined:
    Oct 8, 2002
    Posts:
    124
    Likes Received:
    0
    I'm also betting the distributor. I had the same problem did all the same upgrades he did, except I couldn't get the distributor back in the right spot, when I finally hit the sweet spot she started up but then I ran into more problems but that's a whole other story.

    EAT BEEF
     
  11. magnum4x4

    magnum4x4 Registered Member

    Joined:
    Jan 4, 2004
    Posts:
    97
    Likes Received:
    0
    Location:
    Baltimore, MD
    I have my firing order right I was trying to remember off the top of my head. The firing order was stamped on the original intake. I was asking if anyone knew give or take where the distributors #1 wire should be pointing. 5 oclock, 6, 5:30. This might help me figuring out what kind of change I have to make to the dist.
     
  12. k20

    k20 3/4 ton status

    Joined:
    Sep 9, 2001
    Posts:
    5,068
    Likes Received:
    0
    Location:
    Mineral Springs, NC
    #1 is typically pointing at the #1 cylinder. So thats kinda 4:30ish.....
     
  13. zeroz400

    zeroz400 1/2 ton status

    Joined:
    May 30, 2004
    Posts:
    410
    Likes Received:
    0
    Location:
    Libertyville, IL
    It shouldnt matter exactly where the #1 wire is, as long as the rotor is pointed at the #1 spark plug wire it will be fine. Have you set your timing? Is it still backfiring?


    Later
     
  14. magnum4x4

    magnum4x4 Registered Member

    Joined:
    Jan 4, 2004
    Posts:
    97
    Likes Received:
    0
    Location:
    Baltimore, MD
    I can't even start it. It is backfiring through the carb.
     
  15. elacruze

    elacruze 1/2 ton status

    Joined:
    Dec 23, 2003
    Posts:
    121
    Likes Received:
    0
    Location:
    SE Michigan
    I second the 180* theory. Flip your dist. around. Even if that's not it, it only takes a few to eliminate the possibility.
     
  16. magnum4x4

    magnum4x4 Registered Member

    Joined:
    Jan 4, 2004
    Posts:
    97
    Likes Received:
    0
    Location:
    Baltimore, MD
    I flipped it around, no dice. I hate being broke down. Sometimes flames will shoot out of the carb. My firing order is good. Any other suggestions, PLEASE!!!!
     
  17. zeroz400

    zeroz400 1/2 ton status

    Joined:
    May 30, 2004
    Posts:
    410
    Likes Received:
    0
    Location:
    Libertyville, IL
    Do you have spark? All your wires secure? If its backfiring through the carb you are either 180ºs off or your 5&7 spark plugs are flipped the wrong way.


    Later
     
  18. 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
    From GM Service Manual:
    Installation-Engine Disturbed:
    1. Locate No. 1 piston in firing position by either of the two methods described below:
    a. Remove No. 1 spark plug and with finger on plug hole crank engine until compression is felt in the no. 1 cylinder. Continue cranking until timing mark on crankshaft pulley lines up with timing tab attached to engine front cover.
    b. remove rocker cover, (left bank on v-8) and crank engine until no.1 intake valve closes and continue to crank slowly about 1/3 turn until timing mark on pully lines up with timing tab.

    2. Postion the dsitributor to opening in block in normal installed attitude, noting postion of vacuum control unit.

    3. Postion rotor to point toward front of engine (with distrbutor housing held in installed attitude) then turn rotor counter clockwise approzimatly 1/8 turn more toward left cylinder bank and push distributor down to engine camshaft. It may be nessesary to rotate rotor slightly until camshaft engagment is felt.

    4. While pressing firmly down on distributor housing, kick starter over a few times to make sure oil pump shaft is engaged. Install hold-down clamp and bolt and snug up.

    5. Crank engine by hand to put no.1 piston back in firing position according to step 1. Place distributor cap in position and check to see that rotor lines up with terminal for no. 1 spark plug.

    6. Install cap, check all wire connections.

    7. Connect vaccuum line to distributor.

    8. Start engine and set timing as described in tune-up section 6.
     
  19. 99firehawk

    99firehawk 1/2 ton status

    Joined:
    Dec 15, 2002
    Posts:
    491
    Likes Received:
    0
    make sure you wires are going in the right order clockwise 1 8 4 3 6 5 7 2
    also 1 is the drivers front, then 3 5 7 on drivers side 2 4 6 8 on pass side.

    If you wires are in order, try jumpin all the wires 2 posts clock wise on the dizzy and see if it starts, if its firing through the carb its too advance, throught the pipes its to retatred
     

Share This Page