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  1. K

    Better startup with higher ethanol

    2011 Yukon Denali L94 6.2 Flex Fuel 160k miles... I had some stumbling on a dead cold start up after filling the tank a while back. Cleaned the throttle body and it ran better for a bit, I think it just brought up the idle till it recalibrated. Then I ran a tank of ethanol free premium and...
  2. K

    New to me 2011 Yukon Denali

    So I found that the Yukon had an aftermarket air filter installed, which lead me to wonder if the ECM had been tweaked. I took it to the GM dealer to look at the ECM. Turns out the ECM was still stock, but they did find a bunch of dirt and leaves stuck between the radiator and condenser. They...
  3. K

    New to me 2011 Yukon Denali

    Prices aren't bad. I'll do a little research and probably grab one. Do you recommend any brand in particular? Is there such a thing as a high performance radiator?
  4. K

    New to me 2011 Yukon Denali

    Is this a common fix or issue? I like the idea of a new radiator, but would like to diagnose if possible. I'm thinking it may be a sensor issue. If the radiators get gunked up after so long than I could just do that. The only other one I've replaced was cracked and leaking, in obvious need...
  5. K

    New to me 2011 Yukon Denali

    Turns out the ECM readout is lower than the one showing on the dash. Just a bad gauge maybe.
  6. K

    New to me 2011 Yukon Denali

    I got no ECM codes, and noticed that the oil cap says 5w-30.
  7. K

    New to me 2011 Yukon Denali

    160 000
  8. K

    New to me 2011 Yukon Denali

    This car is awesome. The thing heats up under load though. Hauling a 4k lb trailer on the freeway, uphill on a hot day at low RPM gets the engine heating above were it usually sits. Performs better at high RPM, and has no issue at lower speeds, say 45 mph and bellow. The oil change tag...

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