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  1. gpracer1

    MPG towing and not towing (if not in right section please move )

    IR temp gun, the cats should be hotter than the rest of the exhaust system if working.
  2. gpracer1

    P0171 code and stalles at stop

    Try running the known good gas you have now until it gets low, if it does it again fill it all the way up (record number of gallons) and see if it is fixed again. It may be a fuel level problem, or reported fuel level like it says you have a 1/4 tank but its really emtpy-ish and you are...
  3. gpracer1

    07 5.3 Knock Sensor Issue

    Almost sounds like fuel pump low pressure or fuel starvation/filter, runs lean under acceleration then you get knock and it goes to limp.
  4. gpracer1

    Major FLAW discovery with Electronic throttle control with MAP sensor equipped engines

    I have to call BS on this. The MAP sensor is for sensing load, to adjust timing, shift points, injector pulse width, etc in harmony with other sensors like throttle position, O2 sensors and many others. It does not "command full throttle" if it fails. It is like you are stating a fact.
  5. gpracer1

    Major FLAW discovery with Electronic throttle control with MAP sensor equipped engines

    Say what????????????????????????
  6. gpracer1

    OEM Parts

    Looking for a rear bumper hitch cover for my 2013 LTZ in carbon flash metallic. I will guess they probably come unpainted.
  7. gpracer1

    Anyone Tow a Car with U-Haul Auto Transport Trailer???

    Yes, so putting more weight in front of the axles increases the tongue weight.
  8. gpracer1

    2013 new owner towing report

    Something is not right. Either the trans temp sensor is bad or you are talking C. I’m in Phoenix also and with an LTZ with all the options including K5L cooling package with external trans cooler and 3.42 rear end and my trans temps are 185-195 NOT towing in the Phoenix heat at around 110...
  9. gpracer1

    Anyone Tow a Car with U-Haul Auto Transport Trailer???

    If it’s unstable or wanders you most likely need MORE tongue weight.
  10. gpracer1

    Anyone Tow a Car with U-Haul Auto Transport Trailer???

    Yup, I told them it was a Honda Civic.
  11. gpracer1

    Anyone Tow a Car with U-Haul Auto Transport Trailer???

    When my 99 developed a crack in the torque converter hub and puked trans fluid all over, I rented a Uhaul. Can’t use a WDH with surge but my 7.3 PSD towed it no problem.....of course it’s overkill but my current 13 Tahoe could have handled it in the AZ mountains with some sweat. It fit with a...
  12. gpracer1

    Trans free spinning on 1600 mile trip.

    If it happened once or twice in the past and is ok now it’s probably not a clutch pack as it would be toast and not intermittent. Probably a soloenoid in the trans, or wiring issue.
  13. gpracer1

    Another Tahoe, Another Rough Idle

    If the needle is moving when you change RPMs then the compressor has to be on. Without knowing the high side and low side numbers at the same time...along with ambient temp , we cant make an educated guess over the internet. Find some gauges and shoot another vid.
  14. gpracer1

    Another Tahoe, Another Rough Idle

    The way that video looks, its like you have a really low charge and have it hooked up to the high side. Are there PSI numbers on that gauge?
  15. gpracer1

    Another Tahoe, Another Rough Idle

    It's very hard to diagnose an AC problem without gauges that read both low and high side pressures. You need actual numbers like 30 psi low and 220 high, etc to troubleshoot.......green and yellow isn't going to cut it. Hold it at a steady 1200 rpm and see what the gauges read with AC on high...
  16. gpracer1

    Another Tahoe, Another Rough Idle

    After my left OEM engine mount let go last year due to a smashed gas pedal, I felt the pop/bump when it shifted into second. After replacing with a Hummer mount, I could feel more engine vibration at idle vs the OEM fluid filled one. Maybe the fluid has leaked out of yours....on the way to...
  17. gpracer1

    What rotors do you recommend?

    I installed the Geomet R1 Concepts front rotors, slotted. Took them to my Croyogenics guy, had them cryoed. Installed Police calipers (high temp seals) and police friction pads. I drive a Corvette, and I warp rotors with Tahoes driving too fast and stopping too hard. After over a year of...
  18. gpracer1

    Radiator Fan Issue

    What mikeyss said, and don’t worry about the volt meter. I’m also in Phoenix and on full blast on a hot day the voltage can go down to 12.5 or so which looks really low on the gauge. I’m guessing the ECU is trying to not boil the AGM battery at those high ambient temps. However if both fans...
  19. gpracer1

    2007 6.2 dies after highway drive

    When you say it will not start I assume you mean it cranks steady but no cylinders sound like they are doing anything?.......as if you had no fuel pump or no spark. If that is the case I would go simple old school and spray some carb spray down the throttle body and crank it again. If it...
  20. gpracer1

    Idle relearn after Throttle Body Removal and Cleaning

    And a lime. Lol.
  21. gpracer1

    Idle relearn after Throttle Body Removal and Cleaning

    Turn key on , put brick on pedal, blast TB with carb cleaner.
  22. gpracer1

    Vibration

    Check the ujoints. Just did a carrier bearing on my f350 yesterday for the same thing.
  23. gpracer1

    Upstream vs Downstream O2 Sensors

    Misfire stumble is not normal. Your graph looks ok, upstream O2 sensors should be constantly swinging (narrowband). Where/when is the misfire or stumble?
  24. gpracer1

    Transmission cooler inside radiator

    Yeah, that’s why the “towing package” usually includes the air to oil in series to further cool the trans fluid. It’s more about keeping the temp in the optimal window.
  25. gpracer1

    Transmission cooler inside radiator

    Actually the water to oil coolers work well, much more efficient than air to oil for the same size. Your coolant is about 195 coming out of the engine and cools across the radiator THEN hits the trans cooler heat exchanger. What that temp drop is I don’t know, but it does work for normal...

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