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  1. PNWYukon

    02 tach not working.

    The IPC uses the engine speed signal circuit - 2 pulses/engine revolution - from the PCM in order to calculate the engine speed. The tachometer defaults to 0 RPM if a malfunction in the engine speed signal circuit exists.
  2. PNWYukon

    Fuel Filling/EVAP issues tried everything please help

    The EVAP service port is located in the EVAP purge pipe between the EVAP purge solenoid valve and the EVAP canister. The service port is identified by a green colored cap.
  3. PNWYukon

    Fuel Filling/EVAP issues tried everything please help

    A fuel fill cap that is left OFF after a fuel fill will cause this DTC to set. A loose, missing, or damaged fuel fill cap can cause this DTC to set. A blockage or restriction in the EVAP purge solenoid, purge pipe EVAP canister, or vapor pipe, can cause this DTC to set. A temporary blockage in...
  4. PNWYukon

    Fuel Filling/EVAP issues tried everything please help

    Apply smoke to the EVAP system at the service port until the leak is located.
  5. PNWYukon

    Intermittent Rear end noise 2003 Z71

    "Sound does not change with acceleration." That eliminates any rotating parts. Check heat shields around exhaust and exhaust mounts.
  6. PNWYukon

    Fuel Filling/EVAP issues tried everything please help

  7. PNWYukon

    Fuel pump suggestions

    Parts Cannon!
  8. PNWYukon

    2005 Yukon SLT / blower speed inconsistant , etc.

    Blower Motor Resistor on RockAuto Mine was located below/behind the glove box.
  9. PNWYukon

    Loud Buzz from Lifgtate actuator when locking

    You could test your actuator harness for voltage spikes or irregular voltage. Looks like at least one relay you could look at. Do a voltage test at the fuse to look for anomalous voltage while operating the actuator.
  10. PNWYukon

    2005 Yukon SLT / blower speed inconsistant , etc.

    Check blower motor resistor, it could be failing. Look for melted areas, etc. I think there is another actuator or blend motor where you are hearing the noise.
  11. PNWYukon

    AC fuse keeps blowing.

    Is that the only fuse blowing. Any other electrical issues? If not, then it has to be a short on that circuit. You have to meticulously check the whole line. Anywhere a harness might have the chance of rubbing, binding, pinching has to be checked, even if you have to peel back the tape or...
  12. PNWYukon

    More 4L80E discussion

    https://streetsmarttransmission.com/remanufactured-4l60e-transmissions/
  13. PNWYukon

    Runs like crap after plug change

    The PCM is detecting a crankshaft rotation speed variation indicating a misfire sufficient to cause emission levels to exceed mandated standards. Bad gaps, janky plugs. Does your scan tool tell you which one is misfiring?
  14. PNWYukon

    Dying on idle.

    You have got to get this rig hooked up to a live data scan tool!
  15. PNWYukon

    2005 suburban 5.3 surging on highway under load

    Fuel Pressure: (Key ON, Engine OFF) 385-425 kpa (55-62 psi) Fuel Injector: If the pressure drop value for each fuel injector is within 10 kPa (1.5 psi) of the average pressure drop value, the fuel injectors are flowing properly. Calculate the pressure drop value for each fuel injector by...
  16. PNWYukon

    O2 sensor issues with LT headers?

    RockAuto
  17. PNWYukon

    'Tighten Fuel Cap' creating a P0455 DTC

    A fuel fill cap that is left OFF after a fuel fill will cause this DTC to set. A loose, missing, or damaged fuel fill cap can cause this DTC to set. A blockage or restriction in the EVAP purge solenoid, purge pipe EVAP canister, or vapor pipe, can cause this DTC to set. A temporary blockage in...
  18. PNWYukon

    2005 suburban 5.3 surging on highway under load

    If an engine is not getting enough fuel (this is called “running lean”), due to fuel pressure (regulated by the fuel pump and regulator), restricted fuel injectors, a vacuum leak or really anything that throws off the fuel mixture going in to the engine, this can cause the surge. Vacuum leaks...
  19. PNWYukon

    2005 suburban 5.3 surging on highway under load

    Yikes, that sounds like the classic Castech cracked head issue. You have to remove the valve cover and look for coolant or a crack on the head. Could be head gaskets if you have overheated before.
  20. PNWYukon

    2005 suburban 5.3 surging on highway under load

    Get some Mass Air Flow cleaner and spray it down. Make sure it is totally dry before reinstallation. Big module right next to air filter box, band clamps on each side. Looks like a crazy honeycomb. Intake manifold gaskets might be something to look at to check for leaks.
  21. PNWYukon

    Yet another no heat/ac thread.... I know, I know.

    My 2005 Tahoe with Rear A/C stopped blowing hot air. I found a dude on youtube that showed how to diagnose that it was the controller module, not the blend door. You jump a couple wires and can make the blend door move and it proves the controller module is dead. For the interim I jumped the...
  22. PNWYukon

    AC fuse keeps blowing.

    How often will it blow the fuse? Is it under load, idling, A/C off or on? Only while turning the wheel etc..?
  23. PNWYukon

    Hvac control and dome light questions

    For the love of all things in this world, do not buy a Dorman component unless there is no other option!
  24. PNWYukon

    35's on an 04 tahoe

    Is it leveled? Low sidewall profile tires?
  25. PNWYukon

    Extended length oil filter p/n?

    Skid plate and new low slung crossmember are a tad bit extra. :laughing1:

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