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  1. J

    PLEASE HELP! 1999 Yukon crank no start

    Well i feel pretty ****** about myself, i researched testing these ignition systems with the spark tester and found no spark to all plugs. Tested ignition coil and had spark. So i put new cap and rotor on plug wires and plugs and she lit right off!! I feel so dumb because i just pulled a plug...
  2. J

    PLEASE HELP! 1999 Yukon crank no start

    Any ideas where the ecm/pcm grounds at? Also if i had spark on at least one plug wouldn’t it atleast try to fire off a little? I can’t get it to do anything even with a snort of either it just cranks for days
  3. J

    PLEASE HELP! 1999 Yukon crank no start

    I pulled the plug out of cylinder 1 and looked for spark while cranking, i figured if i had spark there the other plugs would be getting spark as well
  4. J

    PLEASE HELP! 1999 Yukon crank no start

    Copper anti seize will lot interfere with the ground connections. I use it on all my rigs and it also helps them keep a good ground over time keeping water and dirt out
  5. J

    PLEASE HELP! 1999 Yukon crank no start

    Well i just pulled one plug on cylinder 1 and checked for spark while cranking, i had spark on that plug so i figured it was sending spark to others.
  6. J

    PLEASE HELP! 1999 Yukon crank no start

    Hello i am working on a friends 99’ Yukon. A few days ago it was running rough and stalling, changed the fuel filter and air filter and was running like a top. A few days later truck died after going through carwash, and am currently in a crank no start situation. I have scanned codes there are...

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