Knocking noise at start but does not go away...
I have a 2002 Yukon with 25K miles on it and it has been making this noise. I have had it checked by the dealer and they gave me a printout of the statement that was noted earlier in this chat thread. However, the noise has not been going away after the engine warms up. GM states that the noise usually goes away a couple of minutes after startup, but I have found that that is not the case. It is a really bad sounding noise for a gas engine to make and even noticeable by individuals with little or no automotive mechanical aptitude who even make a statement that "something sounds wrong".
I am planning on taking the Yukon back in to another dealer for a second opinion.
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