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  1. slyhog022056

    2010 Yukon XL 5.3 No Power to Coil

    I have continuity from coil to that connector all 4 wires. Between there and ecu is where i lose it. Could not locate the trigger wire st ecu plug with those colors
  2. slyhog022056

    2010 Yukon XL 5.3 No Power to Coil

    The "tech" i talked too told me everything was referenced to ground. Ohmed the black wire out and it was grounded. Engine running I am supposed to have a 12 vdc signal one pin 1, pin 2 is supposed to be trigger. cant detect that with DVOM. started probing with scope and have no 12 vdc or...
  3. slyhog022056

    2013 Yukon 6.2 with p0304 code

    the stabilitrac and traction controls are being shut off by the ecu because of the misfire, they will go away when it runs right again.
  4. slyhog022056

    2013 Yukon 6.2 with p0304 code

    I am having the same problem with #4 I am not getting signal from ECU to coil. Pull the plug wire and put a plug in the end of the plug wire and start it and get out to see if you have spark. dont touch the plug or metal get insulated pliers and ground the end of the pkug and see if it is firing.
  5. slyhog022056

    2010 Yukon XL 5.3 No Power to Coil

    Hello again people. I am trying to get my 10 Yukon back running again. It was crashed and totalled a few months back but still ran. Replaced needed and got it going. I was driving it around over 200+ miles to set the IM for vehicle inspection. Ran fine until all of a sudden it had a cyl 4...
  6. slyhog022056

    Stabilitrac and traction control lights on and charging issue

    2010 GMC Yukon XL 5.3 vortec..... Just this last weekend had to replace oil pickup tube o-ring and remove and block oil pressure bypass on oil filter for low low oil pressure, 2 months? before that had to unstick lifter for #4. Got all that sraightened out and went for a test drive today. 30+psi...
  7. slyhog022056

    low oil PSI when passing

    2010 GMC Yukon XL, 5.3...... Yesterday I made a round trip from Dallas to Memphis, 4 times along the way while accelerating to pass someone my oil pressure dropped from the normal 20 PSI to the point the oil light came on and I had to pull over and shut it down. Was only 1/2 qt low on oil...
  8. slyhog022056

    2022 GMC Yukon Denali 6.2 AFM Delete Possible?

    Do some research, ask a reputable mechanic a friend of mine had the same problem, but there was a work around. There are sensors, that will not let the DFM engage if they are disconnected. Earlier models used the brake fluid level sensor as part of the system, low brake fluid = no DFM - DOD. You...
  9. slyhog022056

    cyl 4 misfire

    Back again. Got a cylinder 4 misfire, been trying off anf on to fix it. No luck so far. Have changed all coil packs, plug wires, plugs, I do have spark at cyl 4.No knocking like a stuck lifter. Should I swap a couple of fuel injectors around or is there a way to check the wiring plug for getting...
  10. slyhog022056

    P0304 code and lights all over dash lit up

    No work in my truck engine at all, 225K on the odometer. I did find out the misfire will cause the lights for traction control and stabilitrac to come on because of the misfire. getting power out of all the coil wires ( just installed new plugs, wires and coils) all the plugs were pretty black...
  11. slyhog022056

    P0304 code and lights all over dash lit up

    Last week my 2010 yukon XL with 5.3 started a #4 cylinder misfire, traction control light on, stabilitrac lights on, tires pressure light on. Throwing only 1 code, P0304 code. When reset it comes back on within 5 seconds. Changed coil packs, ignition wires, plugs. No change. Not sure where...

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