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How can I tell if I am getting good spark?

Discussion in 'The Garage' started by RingMaster4x4, May 5, 2003.

  1. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    I am trying to troubleshoot my power problem. It is like the motor is not getting enough spark or not enough gas. When I first start it in the morning it runs great, but after it get warmed up it seams low on power. Any help is greatly needed. Thanks!
     
  2. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    No one? /forums/images/graemlins/1zhelp.gif
     
  3. Wingnutt

    Wingnutt 1/2 ton status

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    Need a little more info, such as year, carb'ed or injected, computer or not, HEI or something else, manifolds or headers, ect. From what you've given, you could have any of the following problems: runnin lean, have a vaccume leak, yer cold air door in the filter housing (snorkle)isn't opening, low fuel pressure, or yer heat riser is sticking closed, not to mention a couple of bad plugs or wires.
     
  4. bablazer73

    bablazer73 1/2 ton status

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    there are several company's that make a cheap tester. All it is as a lead you ground, and a terminal you put a spark plug wire on, with a thumpscrew adjustable gap. It is marked with the supposed amount of volts needed to make the spark jump the gap. I got one from my snap-on guy for 15.00. so you should be able to find one for 7-10 bucks!
     
  5. Don

    Don 1/2 ton status

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    Just a nice Fat blue spark at the plug. /forums/images/graemlins/eek.gif
     
  6. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    OK sorry. I have a 427 tall deck with new holly 750 carb w/ elec. choke, headers, Accel Super Coil (HEI), Accel 8.8 milimeter wires, Holly Elec. Fuel Pump (the red one). No A/C.
     
  7. Don

    Don 1/2 ton status

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    Maybe a dumb question, but did You leave it as a "talldeck" meaning the truck 4 ring piston's?

    Those engine's are dog's, if left stock because of the lack of compression/piston height.

    There is a .400 difference in deck height on these engine's. and stock, 427 passenger/pickup engine's, stock 427/454 piston's, won't bring it up. /forums/images/graemlins/eek.gif
     
  8. rick88blaze

    rick88blaze 1/2 ton status

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    here's what you do,
    1. remove plug wire from #1 plug
    2. remove spark plug
    3. plug spark plug back into plug wire
    4. lick fingers and grab electrode end of spark plug
    5. have buddy turn over ignition

    if it knocks you onto your a$$, then you've got a good spark! /forums/images/graemlins/rotfl.gif
     
  9. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    Yes it is stock at the moment. I am buying a 454 that I plan on rebuilding for use while I rebuild the tall deack.
     
  10. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    [ QUOTE ]
    here's what you do,
    1. remove plug wire from #1 plug
    2. remove spark plug
    3. plug spark plug back into plug wire
    4. lick fingers and grab electrode end of spark plug
    5. have buddy turn over ignition

    if it knocks you onto your a$$, then you've got a good spark! /forums/images/graemlins/rotfl.gif

    [/ QUOTE ]
    I usualy just grab 8 neighbor hood kids. Have each one stick a finger in the spark plug boot and put a hand on the fender.
    If they all scream with the same volume I know I am getting spare to each cylinder.
    Only problem with this method is you have to live in a big neighborhood. It's hard to get kids to help for this test more then once.
    /forums/images/graemlins/thumb.gif
     
  11. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/thumb.gif
     

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