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  1. R

    Getting 8.5 mpg need help

    Are you calculating? How many gallons for that 218 miles--about 27gallons?
  2. R

    2005 Tahoe - Brakes / traction control active

    The turning of the wheel involves the yaw sensor on the steering shaft--if the sensor is malfunctioning, engine power will be cut to allow the vehicle to stop "skidding". Also, the turning of the wheel requires the power steering pump to increase output to maintain pressure. The hissing, meh...
  3. R

    Stuck at the gas station

    A common cause for this no-start is a switch that is mounted to the transmission. It looks for the transmission to be either in park or neutral. Moving the gear shift selector from park to neutral will sometimes allow the engine to start if the park switch position is intermittently (or...
  4. R

    2001 GMC Yukon XL 6.0L LQ4 TAC Module

    Can you check the integrity of the wiring from the throttle position sensor, the tac module, ECM etc? An inadvertent ground or wires that are shorted together can cause strange codes. Look for green or white corrosion in the pin-sleeve connections. Look for loose connections. Check for corroded...
  5. R

    how to identify transfer cases at risk for "pump rub" ?

    You could call these folks: http://www.thoroughbreddiesel.com/merchant-automotive/transfer-case-pump-upgrade.htm?popup=n They sell an inexpensive kit. You can also buy new oil from them.
  6. R

    think i got a leak need help identifying issue

    You could have a wiring issue where wires have rubbed against a strut under the dash, damaging the insulation. The burning smell more likely indicates an electronic module problem -- each module has its own power supply and the module parts are made to the lowest standards and still do their...
  7. R

    Aging 2004 Tahoe dilemma

    On the subject of drivetrain: GM transfer case lube pump problems are not uncommon. So for you 4WD owners, you should google this issue. When I tore apart mine (2005 with 150K miles), the thrust clip was severely worn. I don't know how much longer it would have lasted before the gear would start...
  8. R

    Fuel pump has power but not running

    You probably have fixed this by now- it is likely the fuel pump relay that has failed.
  9. R

    Connectors are confusing

    The manufacturers probably assume that a list of recommended maintenance items for long-term owners wouldn't make them many friends-they certainly know that o-rings in the coolant system are prone to fail after many years/miles.
  10. R

    PLEASE HELP!!! I can NOT figure out what this noise is...

    Fuzzy, I can understand why so many posters have focused on the alternator, because the noise is a kind of classic sounding electrical high pitched sound. However, I suggest that there are other possibilities (I am certainly not ruling out the alt, by the way): could it be a shaft in the drive...
  11. R

    o2 sensors?????

    You could send an oil sample to one of the oil-testing labs. The labs will send a container and mailer to you and will email a report with both contamination levels and comments about the oil. This will give you info about possible deliberate contamination or oil out of their old oil tank. If...
  12. R

    Potential danger: side view mirror help!

    You could try disconnecting just one battery at a time and that would prove if there is a battery issue. Also check your frame and engine grounds and the grounds inside the cab for corrosion. I think there are some by the e-brake behind the plastic panel, could also be some on the passenger...
  13. R

    p0302 & p0137

    Since the problem stays with the same cylinder, you could have an injector issue, or a stuck valve that is not closing properly, injectors are a more common problem. If you pull the injector, you can verify it's operation in a simple manner by doing a youtube search for injector cleaning, using...
  14. R

    Problem with Front HVAC

    Heater comes on – GM GM has issued a technical service bulletin (TSB) #04-01-38-008 to address AC stops cooling – heater comes on problems with the HVAC system on the following vehicles: 2003-2005 Cadillac Escalade, Escalade ESV, Escalade EXT 2003-2005 Chevrolet Avalanche, Silverado, Suburban...
  15. R

    Anyone ever put in a hybrid engine in an 00 to 06 car?

    If you do find that the mileage is low, ask around about a shop that does good diagnostic work and pay the $80 or whatever to have them at least do an engine report for you. Their knowledge and advice is sometimes worth that money. They do this stuff every day. I have two shops in my area that I...
  16. R

    odd sounds behind dash

    I believe the traction control allows the brakes to pulse on the wheel that is spinning more than the others. If your power steering was low, maybe there is some kind of hydraulic cavitation when the power steering pump is loaded by the brakes, during the ABS activation(when the brakes are...
  17. R

    the heat wont turn off when i turn off the truck

    With all due respect to your experience, Mike, I would like to share my experience with crimp connections. I have discovered that the problems with crimps are usually using either the wrong tool (the cutting blades of a pair of side cutters, for example) or using the wrong size of crimp on the...
  18. R

    Proactive Alert 2016 Yukon

    An old saying: Garbage in = Garbage out
  19. R

    Please help! Heat doesnt work!

    ^^^^^^^^Bingo! Very common in older vehicles that at one time or another did not have properly scheduled coolant replacement, especially with the "long life" coolant. A gel can build up in the coolant system, or rust or silicates, etc.
  20. R

    Rear climate controller doesn't work

    Complicated vehicles like yours need a TechII to troubleshoot. You can take it to an independent shop or a dealer for troubleshooting, then do the repair work yourself if you prefer.
  21. R

    Trouble converting overhead Climate Control to LEDS

    If you can't examine the foil tracing on the board for a crack you may have to buy a new control module. There is only one source of power for the lighting to that controller, so if one or two are lit, the others should be also.
  22. R

    Anyone ever put in a hybrid engine in an 00 to 06 car?

    ^^^What he said about injectors. There are multiple youtube videos on cleaning your injectors. If they get clogged up, they spray like a spray bottle on stream instead of on mist. The holes are very tiny and easily partially clogged over time affecting the ability to "atomize" which is a fancy...
  23. R

    Clunking/ knocking noise when floor my 06 Yukon denali

    I agree about the transfer case chain. If you think about the logic, a chain has many different parts that can wear and stretch. I have replaced multiple chains over the years in different vehicles that had clunking in the drivetrain. Almost always solved the problem. It seems to be more...
  24. R

    Flex Fuel Sensor Failed Again

    Why not simplify--install the replicator that Adam mentioned above and avoid E85. The only people that benefit over the long haul from E85 are the mechanics who replace the sensors. They are notoriously unreliable.
  25. R

    Proper rad pressure test procedure? 2004 Yukon 6.0

    If you have the rear heater/ac, the two coolant tee connections at the center of the firewall above the motor are prime candidates. O-rings are great inventions for assembly line workers, just plug it together. For long term sealing of hot coolant, not so great. The rubber will eventually shrink...

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