Recent content by hagar

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    2018 Yukon SLE Rough Idle/Pulsating idle

    There is no idle control valve on a 2018, it just opens the throttle blade to adjust idle air. Assuming the tune is stock and someone didn't mess any settings up, it sounds like a textbook vacuum leak. When you first start the truck, it holds the throttle open a pre-set amount. If you have a...
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    2010 DENALI 6.2 Motor "Seized"

    Pull your spark plugs and turn the engine over by hand. I have seen it before that a head gasket went and filled a cylinder with coolant. The engine would turn over part way in both directions before locking up, exactly like yours. I actually thought the engine had a broken crank or rod or...
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    My '02 Tahoe L59 revs WAY too high on cold start ups. Anyone got any ideas?

    Oh, and tps as well to make sure there isn't something wrong with it and it's showing more than 2 percent throttle at idle. If it is reporting more than 2 percent, it will kick it to the part throttle timing map which has higher timing and also throttle adders via the iac that will hang the idle.
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    My '02 Tahoe L59 revs WAY too high on cold start ups. Anyone got any ideas?

    Like others have said, you need to get a scanner on it. At warmed up temp you want to see the short and long term fuel trims, the IAC duty cycle, the engine and air intake Temps, and the rpms. There are others that can help further, but those are the important ones to get it almost for sure...
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    My '02 Tahoe L59 revs WAY too high on cold start ups. Anyone got any ideas?

    Absolutely. In this case it's possible it isn't able to go from its more open while cranking position, to less open right after it fires. It should never be open enough to flair to 2500 if the tune is stock though. On some gnarly vehicles I like to make them crack ******* cold starts and hop up...
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    My '02 Tahoe L59 revs WAY too high on cold start ups. Anyone got any ideas?

    Not trying to be THAT guy, but the more likely culprit would be that the pintle is restricted from closing quick enough after start up. With the added fuel of the cold start enrichment based off the coolant temp adder, the truck would rev high if the pintle was stuck more so outwards away from...
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    My '02 Tahoe L59 revs WAY too high on cold start ups. Anyone got any ideas?

    And this would be super easy to figure out with a scanner and logging the idle air duty cycle. If it's a vac leak, you will see the iac counta drop way down, probably right to 0 with a leak this bad if it is a leak. The iac will close as far as it can, then the truck will start pulling timing to...
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    My '02 Tahoe L59 revs WAY too high on cold start ups. Anyone got any ideas?

    After it warms up to temp and idles properly, unplug the iac while idling, shut the truck off, and let it get cold. Try starting it again while cold with the iac unplugged and see if it still revs right up. Most likely it won't rev up. I would guess you have a vac leak. When you start an iac...
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    Input or advice from others on cam swap for 6.2L 2011 Yukon Denali

    I killed the timing at idle in drive and when returning to idle while coasting to fix the stall push. I am too late on the exhaust thing, but as said above, cats make great mufflers, and they help clean up some stink. Funny story since you brought up the wife and embarrassed. I did a big ass...
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    Input or advice from others on cam swap for 6.2L 2011 Yukon Denali

    Super awesome! Do another oil change after first drive is my approach. Would have suggested you use cheap oil with a break in additive if I thought of it. You did absolutely nothing wrong, just costs an extra 50 bucks for oil. You didn't do any damage or anything. I put a factory built HKS...
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    Input or advice from others on cam swap for 6.2L 2011 Yukon Denali

    As wisely mentioned above, strain and go.
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    Input or advice from others on cam swap for 6.2L 2011 Yukon Denali

    If you didn't get anything in jt, go for it.clean oil is clean oil.
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    Input or advice from others on cam swap for 6.2L 2011 Yukon Denali

    Leave it 5w30. Don't want thick oil in that engine
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    2doorconversion

    If I bring you my 2 door Tahoe, can you turn it into an xl?
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    Input or advice from others on cam swap for 6.2L 2011 Yukon Denali

    It would be like installing a control board that uses locating dowels, but you miss with the alignment of the dowel, then when you tighten down the board, the dowels crush the board, instead of the board sitting flush. It's super common and I have done it before. Maybe I say it's super common to...

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