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  1. R

    2008 Tahoe Elctrical issues.

    If you do find all the grounds and they are good---even if the battery checks out, a last ditch thing to try is replace the battery. Internal electrical noise from a battery can cause strange symptoms. This is not likely to be your problem, but I have fixed strange symptoms this way.
  2. R

    Potential danger: side view mirror help!

    I have found that replacing the battery in two different GM vehicles has fixed the problems you have. I suspect the batteries had internal bad connections. Even though these batteries load tested ok, the trucks didn't like something about them, causing intermittent problems with mirrors...
  3. R

    Still the same problem!!!!

    There is a huge volume of stuff coming from China and other countries that has been "reverse engineered" to duplicate/imitate oem products. It is also up to us so-called knowledgeable consumers to be aware of this dishonesty. The corner auto parts store is probably a good place to start when...
  4. R

    How much fuel do you take?

    One possible reason for the excess fuel is pump cooling. However, it doesn't take 6 gallons to cool that little pump. That is how much I have in my tank when "empty". It is probably a combination of sloppy engineering and unknowns. Using the same pump module for multiple vehicles to save...
  5. R

    Dome light sometimes wont work

    The latch is the easier part to adjust, which you can probably do. If it involves the hinges that is a little harder.
  6. R

    pegged oil pressure gauge, jumpy after replacement?

    The lack of that plastic piece can cause the issue you have. Another possible cause would be the wire harness that connects to the sensor. My bet is the plastic insert.
  7. R

    XM Radio losing signal

    A couple of possibilities for losing signal in the same area: local sources of radio frequency power interfering with the satellite signal. Satellite power is very weak, so XM also uses repeaters on the ground. So if a harmonic of a local radio/radar signal falls into the freq. range of the...
  8. R

    Where does Fuel Tank (Pump) Ground to Chasis

    There is no external ground. The fuel gauge is wired directly to the PCM. The PCM provides what is called a low reference, probably a ground, which is a black wire(PCM terminal C-1 #23). The signal wire that controls the fuel gauge is purple (PCM terminal C-2 #54). According to the wiring...
  9. R

    XM Radio losing signal

    Common causes of electronic failure are capacitors failing. The quality of capacitors used in modern devices has gotten steadily worse (much like AA batteries). A power supply will start making less juice, volume gets weak. Another common problem is the type of solder that is used complies with...
  10. R

    Transfer case problem?

    Could you have a frozen bearing in the transfer case? You could call drivetrain.com at 800-216-1632. They don't charge to talk! I have bought a couple of rebuilt units from them and had good success. They seem to make a quality product.
  11. R

    04 Yukon No rear heat

    Joseph, the body codes do not necessarily show up on scanners. Many scanners are only designed to read engine related codes. Unfortunately the packaging/labelling often does not mention body code information. Before purchasing a scanner I suggest looking for reviews or opinions on how they work...
  12. R

    Moisture out the tailpipe, sign of cracked head?

    The 5.3 motor has a dry intake manifold made from plastic, no coolant in the manifold. But GM makes up for it by using the castech 706 heads many of which form small cracks around the head bolts. Small amounts of coolant leak into the rocker arm area through these cracks. Since you have 862...
  13. R

    AC Fan blower quit working on high

    The drawing is not correct. Even engineers can make mistakes! The blower motor wire labeled PPL for purple color should be wired to the common terminal of the relay (where the dark blue wire is connected). The dark blue wire then connects where the purple wire is currently connected. That is...
  14. R

    hi i have a 2002 gmc yukon 4x4 3/4 ton with a 6.0.

    A multimeter is only marginally helpful diagnosing high voltage ignition problems. The swapping of the coils is the easiest way to determine if the coil is bad. If the problem moves to the new location when you move the coil, then the coil is the problem.
  15. R

    Permanently unlock GM radios for free DIY

    What an innovative fix! All of a sudden all those old radios out there have some value! Thank you!
  16. R

    Best wheel hub assembly??

    No matter which brand front hub you choose, check the bearings for being too tight before installation. I have found this problem in several different brands, including Timken. Factory automated assembly tools are not always calibrated correctly. A little stiffness is ok, but if the bearing...
  17. R

    A/C compressor from Rockauto part number neede

    You could go to Amazon and get this compressor for $364: https://www.amazon.com/Compressor-10s20f-Denso-Chev-Gmc-Cadillac-00-04/dp/B000FJDIQ4/ref=pd_sbs_263_2/134-7646870-5738306?_encoding=UTF8&psc=1&refRID=ZQX64EPN531DM3F88725
  18. R

    Please help! Ticking Noise from transmission

    You could put the truck on jack stands, crawl under with an automotive stethoscope while your driver starts and runs the vehicle in various gears. If you hear the noise from the transmission, it is probably time for a rebuild. I would also check the transfer case with the stethoscope. The...
  19. R

    How To: Lapping Valves on LS Heads At Home

    Steve, very well done with the pic's. There is no doubt that valve lapping extends valve life and makes the engine more efficient. Thanks for the tutorial!
  20. R

    Rough Idle

    Could you have a wire that goes to the trailer tow button that has the insulation worn? Or wiring in the steering column that is being affected by the position of the shift lever? It is a long shot. How about wiring near the transmission that might be affected by the shift mechanism? Mice and...
  21. R

    BELT TENSIONER, IDLER, ? CHATTER

    If you still can't find, an automotive stethoscope is a handy, cheap tool to help hear how the various bearings sound internally. You don't place it against anything moving, just adjacent to the idler, pulley, etc. Also, a digital thermometer can show the running temp. Old bearings heat up as...
  22. R

    Engine stumbling,very odd

    One more point I should have made: One reason a temp sensor can affect an engine only when it is cold is that if the sensor falsely tells the PCM that the motor is warm when it really is cold, the PCM puts the control system in "closed loop" mode which is the normal mode when at normal operating...
  23. R

    Engine stumbling,very odd

    Coolant temp sensors on older engines should be replaced since they can start to fail by losing their accuracy slowly over time. This can cause the engine to run poorly. A $30 part that has a significant effect on the engine. I have repaired multiple engines of different brands over the years...
  24. R

    Towing Heavy

    A half ton vehicle is going to be very close to overloaded towing that trailer. Trailer Life Magazine has an annual booklet that lists the max trailer load for each towing vehicle. Trailers can cause problems when towed with shorter vehicles (crosswinds, bumpy roads, semis passing, etc can cause...
  25. R

    No crank/start/anything condition with radio also in locked mode.

    For $40 or less you can sign up at Alldatadiy.com for 5 years. The drawings clearly show that the ignition switch sends 12 V+ (fuse labeled IGN A) to the PCM in the start mode. The PCM then provides the ground for the start enable relay. The start enable relay then sends 12V+ to the starter...

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