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  1. R

    Brake pedal fluttering

    There is also a specific way to bleed the abs pump/lines that a shop can do with a scan tool. If even a little air has gotten into the ABS, you can have symptoms like you are describing. As others have said, a sensor or front axle unit bearing going out will also cause a problem. The...
  2. R

    Absolute throttle position

    a little carbon on intake valves could cause the lower compression. The slight missing could also be caused by injectors not properly atomizing. You could watch internet videos on how to clean them with fuel injection cleaner. Youtube has multiple videos on an inexpensive method of doing this...
  3. R

    Can I get a full pour?!

    I will throw out another idea based on the 24 gallon tank on my Tahoe. When the gauge shows empty and the light comes on it always takes about 18-19 gallons. So I tried driving it one time until I calculated that I had used up most of the gas (didn't want to run the pump dry). I pumped 23...
  4. R

    Rear wheel play in and out - source of clunk?

    This is a fairly common complaint about the tahoes. A couple of comments: Your rear axle does have excess end play (from watching your first video). Unlike the engine, there is no oil filter in the differential. As the metal parts wear, those little particles that you see attached to the...
  5. R

    Help me find this oil leak please!

    Maybe you didn't see the posting about a clogged pcv valve. You can replace every oil related gasket on the engine, but if the pcv valve is clogged, pressure will build inside the crankcase and push oil past most of the seals on the engine. The reason this happens is that as the engine ignites...
  6. R

    Help. Speedometer reading crazy and erratic shifting???

    Congratulations on doing a good job troubleshooting and fixing it!
  7. R

    Castech heads question/opinions welcome

    A slightly hidden location of coolant leaks are the tee fittings at the fire wall above the rear of the motor where the rear heater hose connections are located. Rubber o-rings in these tees make it easy for the factory, but over time the o-rings can shrink and start leaking. Also, auto parts...
  8. R

    2003 Yukon SLT flex fuel 5.3L whats brand would you use? cam, oil pump, lifters, timing chain

    You might want to consider inspecting and/or replacing the knock sensors and harness while the engine is out. Because the sensors sit in a recess on top of the motor, water often damages the connections over time.
  9. R

    03 tahoe blower Moyer stays on all the time

    Your fan control module is broken. this sends 12 volts continuously to the fan. it is possible that the fan is also going bad, because as it starts to short out internally, it destroys the fan control module. Rockauto.com or any auto parts store has them
  10. R

    A/c..... grrr

    If the blend door is working properly wouldn't you have both heat and cool in the front? Since you said that "the front blows warm" I am assuming that the front blend door has a problem. I think it is safe to say that Freon is in both AC evaporator coils, since the back works ok. It is unlikely...
  11. R

    AC grinding/hiss and Warm Air

    You are following a logical path to troubleshoot this. It sounds like you have the dual temp controls for driver and passenger, so there is a blend door for each side. It is possible for both blend door actuators to fail at the same time if there is a failure in the control panel on the dash...
  12. R

    What is the correct tire pressure?

    A tire dealer once suggested I go to a vacant parking lot or quiet street with a piece of chalk, mark a front and rear tire tread with a couple of lines across the tread, then drive straight for a short distance. The chalk will show you if the inflation is too much (center wear) or too little...
  13. R

    New AC Compressor = Smooth Idle

    A compressor that has dragging bearings or other internal problems can cause a drag on the engine and affect the idle. Similar to a failing starter can ruin an otherwise good battery the compressor can lock up and destroy belt and pulley.
  14. R

    05 TAHOE A/C Recharge

    The blend door only affects the front temperature. If both front and rear are not cooling, then you are going the right direction. Did you do a leak test with a leak detector or add dye when you charged the system? Possible leak locations are the front seal of the compressor caused by either an...
  15. R

    A/C Blowing Warm in Town

    The important step that Ian mentioned above is to have dye added to the system. A UV flashlight is very cheap. Use it after running the AC for even a short time (15 minutes) in a darkened room or at night. You don't have to wait until the system is running warm. At 250 psi, it won't take long...
  16. R

    Issues dropping into drive

    Why not take it to a trusted transmission shop (not chain store type). You could even call one. They can explain any of the possibilities like valve body, low pump pressure, etc. If the fluid is really old, there may be enough contamination of the fluid that a solenoid in the valve body is...
  17. R

    Recirculation mode

    If it is truly working in reverse, that means the door is working. I agree that testing the actuator is advised. Unfortunately GM seems to have this issue with other components like seat actuators, mirror actuators. So testing is advisable.
  18. R

    Head gasket replacement checklist

    Is it possible that you have Castech heads? They crack from bad design--reinforcing ribs left out which allows the head bolts to compress the head too much. One sign of this compression is a clean spot around the head bolt and slow leakage of coolant over several months usually. They are not...
  19. R

    5.3L hard start when warm

    There are other things that heat affects. A heat soaked battery can produce low voltage. Loose/corroded battery cables can act different when a hot engine is cranked. Sensors that get heated by an engine that is not running/no coolant flow/no air flow can move just out of operating range. With...
  20. R

    Too Light Steering

    I don't believe that the older tahoes and yukons have variable assist power steering. The steering wheel position sensor is only used to detect under/over steer and to engage the traction control system. So I don't think replacing the sensor will eliminate the wandering/lack of center road feel...
  21. R

    01 Tahoe overheating- stumped

    What is your indication of overheating--engine temp gauge or??
  22. R

    01 Tahoe overheating- stumped

    There are some vehicles that will overheat if no thermostat is installed-i have heard the reason is that the coolant moves too fast for proper heat exchange. This obviously isn't the cause in this instance.
  23. R

    Noise in 4wd when on Auto4WD

    One test for hubs going out is to use a digital thermometer (about $30 at home depot) to check for excessive temp after driving for 30 minutes. As the lube dries out, friction increases, heat results. Compare left to right. You can also jack up, grab tire top and bottom and attempt to wiggle in...
  24. R

    Price for rear gear swap?

    adjusting the lash (clearance) between ring and pinion is the most important part of the job
  25. R

    Transmission shifting hard

    Have you checked it for codes? Use a $15 hand siphon pump to take a sample of your transmission fluid or drain some fluid into a clean bucket and look for metal particles. Fluid pressure should vary depending on need. The pressure regulator is variable and controlled to ensure good shifts. If...

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