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Message: <blockquote data-quote="Tonimus" data-source="post: 25790" data-attributes="member: 12914">As far as early and late GMT800 SUVs, I prefer the later ones because of the L59. It's the flexfuel model, but doesn't have a flex fuel sensor. Bigger injectors, steel fuel rails, doesn't care what gas you put in it. The SUVs are also non-CAN. I like the lower level of tech. Everything else is just styling. There's a decent amount of aftermarket support, so you can do a lot.Knock sensors are a common issue. Seems to be more prevalent with guys who wash their engine bays. That's just anecdotal, though. Other stuff can also cause false knock readings. Loose heat shields, large exhaust manifold leaks, bad motor mounts. I wouldn't be surprised if a loose top cover could cause the occasional knock reading.</blockquote>