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  1. R

    Throttle body coolant bypass on 2005 Tahoe 5.3

    That bypass connected to the throttle body provides an additional benefit of creating the highest point in cooling system, which means all air in the cooling system will go to that point & be drawn to radiator when the thermostat opens In short, it's a great protection for the combustion...
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    Lost and more than a little bit concerned...

    If it runs with those security system/key codes then somebody has likely bypassed the VATS by installing a permanent resistor or disabling the system in the PCM If it was disabled in the PCM due to an intermittent failure caused by a failing key tumbler in the column, the original intermittent...
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    2000 GMC Yukon XL 1500 SLT 2WD (5.3L) - Brake Pedal Goes to the Floor

    Your system is full of air, the computer bleed won't fix that; you need to thoroughly bleed the brakes in the correct order until your brake pedal feels normal; then use the computer abs bleed function to insure the abs system works as designed You also may have a pedal rod length issue since...
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    2004 Yukon - Feels like Ice Skating - HELP!

    You don't have enough positive caster in your alignment, nearly impossible to have too much but to little makes it feel like it doesn't want to go straight ahead but instead wander constantly with every road variation
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    No A/C, driving me crazy.

    Nonickatall outlined this perfectly! I would only add that any AC shop that told you your clutch is bad on a system that engages & works normally with the relay jumped has no idea how the system works, disregard everything they told you about your system; it never should have been opened up &...
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    2005 Tahoe A/C Problem

    The temperature is controlled by the blend doors on a 2005, these doors are adjusted with small electric "blend door actuators" that are a common failure point but are readily available Usually there are 4 blend door actuators in the front A/C Heat system, 2 control the temp for driver &...
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    California smog i/m 02 sensor code needs complete

    Your 03 has 4 02 sensors, all 4 are heated The 2 02 sensors located upstream of the catalytic converters assist the PCM in regulating the Air/Fuel ratio. The 2 02 sensors located after the catalytic converters are used by the PCM to compare the content of the exhaust after the catalytic...
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    Anyone waiting for the next gen V8s?

    All the more reason to buy one as soon as they are available But I suspect it will be much harder to return to the cursed state we are in now after everyone gets a taste of good vehicles, reliable appliances & affordable energy We got here slow like the boiling frog so many never knew how...
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    Summit racing performance LS cam

    I used that cam last year, pretty good but I paid less The order I did was turn off the AFM, VATS & make adjustments to the base tune to insure it would start, idle & run close to correct (Matt Sanford has videos on how to do this for most versions of LS, use a tutorial for any of the stage 2...
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    Anyone waiting for the next gen V8s?

    GM doesn't want DOD/AFM any more than we do, they are forced to use it to avoid EPA penalties on every engine they sell The EPA is easing up on these requirements so making engines that consumers want will hopefully be possible again soon
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    just changed my plugs....

    I say this a lot but for a rich/misfire condition my 1st diagnostic move is to unplug both primary (upstream) 02 sensors and drive it at highway speed for 5 or 10 miles This will throw a code but if tthe rich condition & misfire go away you know 1 or both upstream sensors were sending a false...
  12. R

    THREADS pulled out of oil pan drain plug.

    The boss on the pan is plenty thick enough to tap to the next larger metric straight thread (those plugs with seal washers are readily available on Amazon if you search the diameter you need with the thread pitch, example would be "10mm x 1.5 metric seal plug" if 10mm would work) Then just buy...
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    Engine dies at slow speeds inconsistently

    My bet is a false lean code from one of your 02 sensors, the ECM is trying to correct it by dumping more fuel Easy to check, just unplug the upstream 02 sensors & see if the smell & symptoms go away; it will throw a code for the sensors being unplugged but the fuel map will be much closer to...
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    Tie Rod End Question

    You boogered the threads so the nut hits resistance before the tapered tie rod end seats in the hole; so it just spins A good impact gun with a jack under the tie tod end to set the taper might work but not if the threads were beat up really bad So I would remove the nut before you try to...
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    Stripped Spark plug help

    Too loose blows out plugs usually, if you over tightened enough to strip the threads it would have blown out a long time ago after you changed the plugs I wouldn't over think it, pull the head and use a Timesert designed for aluminum heads (not a helicoil), the aluminum heads need a longer...
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    Issue After Brake Rotor & Pad Replacement

    To diagnose the brake hose, apply the brake very hard in the driveway for a few seconds, then release the pedal Jump out & loosen the flexible brake line at the caliper (not the hard line) and see if it squirts brake fluid like it's under pressure, it should just leak a little; if it squirts...
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    2005 Tahoe PCV Hose Routing

    Stock routing is drivers side to intake plenum on top of the plenum, passenger side from throttle body to valve cover My opinion on your smoke is standing oil accumulated in the intake plenum due to the vacuum pulling on the PCV valve exceeding the valves ability to deflect the oil mist in the...
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    Fuel injector cleaning machines - worth the money ?

    I made one with a used Tahoe fuel pump & an old fuel rail from a 1980's TPI system They are quite useful for cleaning & checking for consistent flow rates The reason I made it was because of the high failure rate of new injectors these days, not uncommon for a set of 8 to have 2 stuck open or...
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    Looking for a steering box..HELP!

    Lot going on here, a 2006 steering box that's ruined at under 200k is not common & literally nothing on a 2006 Tahoe is unavailable If your leaking PS Fluid the hoses, input shaft seal or power steering pump is most likely the culprit; hoses especially if you have the hydro boost brake system
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    Spit a plug, What to do?

    The inserts to repair the heads are not all the same, aluminum heads have more threads than cast iron heads but both use a 14 mm insert or heli coil If you used the shorter cast iron insert it would explain why the plug & insert blew out, the softer aluminum needs all of those threads to hold...
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    [SOLVED] 2004 Tahoe overheating. New water pump, thermostat, radiator

    Leave that heater hose valve open, you can't block them on an LS The fan clutch should have resistance even when cold, if it spins freely when cold it's bad When you top off the coolant, disconnect the steam port line at the throttle body as you fill to push all the air out, then reconnect it...
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    TPMS question

    Air all 4 tires to 42 psi & see if the warning goes away, if it does it just means the tire psi you've chosen is lower than the ecm setting to warn you If you want to run less or more psi than the current setting in the ECM, you have to change that range; if you don't the ECM will just assume...
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    Help me figure out what to do with this boat anchor

    This is a standard double din in my 2001 yukon, they don't make a kit for this year so I used a generic double din install kit & trimmed the factory bezel & modded the kit to make it work but it fits like factory I had to do this on a 2000 silverado & a 2002 Sierra as well because the easy...
  24. R

    4 Corner Water/Steam Ports

    The steam ports in the back are only needed if the engine angle is less than 3 degrees down slope, they do nothing if the drive train is angled down to the rear They also don't prevent overheating, they just prevent hot spots in the combustion chamber due to air pockets where coolant must be...
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    2004 Tahoe Z71 5.3L Reduced Engine Power Issue

    If your ABS light has been on it's possible that whatever caused it to come on (cold solder joints in the brain, bad wheel speed sensor,...) was not something that effects drivability; but over time you have lost functionality of ABS components that will effect drivability For instance the...

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