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  1. R

    Intake Manifold Gasket Symptoms

    So if it isn't plug wires, what about the knock sensors? Mechanics often change them out when doing the intake gaskets on this motor because of the knock sensors being a common problem. It is certainly worth pulling apart the wiring harness connectors under the hood and looking for evidence of...
  2. R

    Maybe trans? Maybe not

    Your tranny is toast. Certainly an air filter breaking off is serious, depending on how long this went on, the damage to the engine will be evident over time (worn rings-silicon is fairly abrasive). But, the tranny issues are not related. After replacing the tranny and torque convertor, do not...
  3. R

    AC Delco or Dorman oil cooler/trans cooler lines

    It depends on how long you will keep your rig. The difference in cost compared to what you spend in fuel or insurance a year is what? Those lines are fairly important.
  4. R

    05 YD AWD front differencial help need

    AWD tahoes and yukons are hard on the front differential.
  5. R

    Overheating and no heat

    A cracked head(s) can allow coolant to leak into the valve cover area. This type of leak happens more often in heads with a #706 embossed on the upper face of the head in the lower right corner. Google Castech heads. This type of leak can be so slow that the coolant mostly evaporates in the top...
  6. R

    Need help- spark plug wire broke, dead cylinder

    Electrical tape won't stop high voltage arcing (50,000 volts). You should disconnect the injector like was suggested.
  7. R

    Thoughts on this Tahoe Z71 please!

    take it to your mechanic and have the coolant system pressure checked. that will rule out cracked heads, leaking intake gaskets (both are common problems). Have the mechanic look for leaks under motor, transmission, transfer case, rear and front axles.Check the engine oil, transmission fluid for...
  8. R

    A/C compressor locks intermittently

    Can you disassemble the old compressor to inspect? One other problem that will lock up the engine is the dampener that is mounted to the front of the crank. When the rubber starts breaking apart, the dampener can tilt from the belt pressure and grind against the engine. But that is usually only...
  9. R

    engine replacement??????

    Have you called Summit? They have a sales and support staff that you can talk to. Google Silverado forums, some of them have more frequent users that get into engine swaps and the technical stuff.
  10. R

    '08 Yukon Denali Oil Pressure Sensor Replaced. Gauge still "dead" below ZERO

    Why would the problem go away after changing out the sensor if the pickup tube o-ring was bad? Is it possible that a factory making these pressure transducers is cranking out faulty products that work for a while, then fail? The way parts are sourced nowadays is so different from even 15 years...
  11. R

    Pitman / Idler arm help needed

    There is a possibility of more than one problem. One thing to check if you haven't is have someone in the truck rotate the steering wheel while you lay under the truck watching for looseness in the linkages, like a bad idler arm (even though it is new). Factories do not always ship good parts...
  12. R

    Bad Gas Mileage?

    you could try experimenting with different speeds on longer trips. Maybe lower would increase mileage.
  13. R

    Tranny and transfer case need replacing

    Research "pump rub" problem in the transfer case. Many GM 1/2 ton and 3/4 ton transfer cases can eventually fail from this problem. The lubrication pump in the transfer case has a gear that can grind a hole through the aluminum case after a thrust pin wears out. The fix for this problem (before...
  14. R

    03 Yukon sometimes Doesn't start.

    When it does not start, try moving the gear shift selector to neutral instead of park, then try to start. There is a sensor module that detects the transmission gear status. This device is mechanically moved every time the gear selector is moved. It is prone to failure. The sensor name escapes...
  15. R

    Question: Truck roll after shift to park?

    See my fix for your problem in your other thread
  16. R

    No Parking Brake

    The parking brake shoe after installation may be installed a little off-center, which will cause the rotor to rub when it is installed. Remove the wheel, and caliper/caliper bracket again. As you start to remove the rotor inspect the gap between the shoe and the inside of the rotor. There should...
  17. R

    Vacuum pressure when removing fuel cap - solenoid?

    Another likely cause of vacuum in the fuel tank is a lack of venting when the vehicle is driven. As fuel is used, volume of fuel is reduced, volume of air is increased. If the vent system is not functional, vacuum can result, especially over longer trips, between tank fill-ups.
  18. R

    Very Hard 1-2 shift, Service Stabilitrak Light

    The GM vehicles seem to have a (for lack of a better word) "buggy" or unreliable control system. I suspect there are too many lines of code with too many patches applied over the years to solve various problems. This is the problem with Microsoft applications as well. Replacing the battery if...
  19. R

    4 cyl to 8 cyl, don't like it, question?

    The cylinder shutdown system is impractical, will not last the life of the engine. You will have fewer mechanical problems if you override the system. The federal government should stay away from mandating poorly engineered/manufactured automotive systems. In the long run, there is no savings...
  20. R

    A/C blowing warm

    Did you charge with liquid or gas freon? What pressures are you seeing on suction and discharge? Could you be pushing heated air through because the heater is engaged? If the system truly needed freon, there is a leak that needs to be found or you will continue to have problems.
  21. R

    Help!!! collapsed lifters???

    I suggest for the health of your engine that you do not drive the car until you repair. Noisy lifters are not your engine's friend. Damage to the cam, rocker arms, valves is possible.
  22. R

    2004 Tahoe Radiator

    The pricing on auto parts depends somewhat on the country where the part is made. Chinese parts made for the replacement market can be substantially cheaper and the quality can be lower. Japanese, American, European parts are more expensive generally, but can be better quality. Rock auto and...
  23. R

    Rear brakes getting hot....HELP!

    Proportioning valve could cause this or master cylinder not bled properly. If you replace the master cylinder, be sure to follow instructions on how to pre-bleed the cylinder. If there is air in the front brake system, the rear will be doing most of the braking. If bleeding the brakes does...
  24. R

    Vacuum pressure when removing fuel cap - solenoid?

    You are smart to be concerned about vacuum in the fuel tank. Vacuum can make the fuel pump work harder, shortening it's life. If the vacuum is strong enough the engine can run poorly and have low power due to a lean condition caused by low fuel pressure. Mysterious codes could then appear when...
  25. R

    Rear locker/diff issue?

    I think you have a transmission problem. When things get sticky in the tranny, a solenoid or a clutch piston can hang up. If either of these things happen, the clutch does not lock up. No power through the transmission. So it is either in the valve body or in the clutch piston/drum assembly...

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