2021 GMC Canyon elevation standard 3.6L ambient air temp sensor wire
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Fully warm, coolant temp >194, closed loop. Run time can be anywhere from just reached operating temperature to having driven 30+ miles. The O2 chart (which is a feature I just discovered after reading) for the bad idle seems to be "most" of the time. For the little time I've been watching it (scanning and driving! watchout!) I can't seem to isolate any cause or condition yet. It definitely idles rougher sometimes than others and so far what I've seen is the rougher idles are always rich. But not enough to set a CEL. In other news I replaced the starter solenoid. Everything on this truck is such a PITA. Starter "snout" is mangled up with the torque converter inspection cover which is tangled up with hard cooling lines and the driveshaft. But I got 'er done without too much swearing...I just go into everything now knowing it's going to be a frustrating mess. The starter solenoid replacement kicks off the next round of work: AC, injector rebuild, cat, exhaust. I'm just going to do it all. But first: I don't know what my fuel pressures are. I can't definitively say the issue is the injector without first verifying fuel pressures and any leakdown. I "rented" a test kit ($199.99 at O'Really's ...intentional misspelling). They don't "rent" tools anymore, they charge you for the tool and then you return it when you're done. No joke. It is listed as a rental on the receipt but the guy told me there's no difference between renting and buying now, you just return it when you're done and they refund the credit card. Mmmkay, whatever. I will rule out fuel pressure issues (too much), and any leaking (that's how I'll know the problem is inside the intake). I think someone said the return line could be plugged or not flowing and that could cause high fuel pressure (and too much fuel being pushed through injectors). I'll cross that bridge if I get high readings. As of now I'm ready to tear off the intake cover, extract the injector, and have it sent off to be rebuilt just so I can rule that out. -
By asilverblazer · Posted
What are the conditions of this rich idle? Warm or cold engine? Run time? Does every idle look like this or only sometimes? -
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By mrjulian416 · Posted
This guy is a custom engine builder, both diesel and gas. He recently posted this vid of a tear down of an L8T for rebuild. Seems to like a lot of what he sees We Tore Down GM’s Biggest Gas V8… Here’s What We Found It's a bit of a long video, bottom line it's a very well built engine but in this case, excessive heat in the rear cylinders can be a problem. -
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