My truck, a '00 GMC w/a 5.3 w 100k miles, has the annoying start-up piston slap. However, at about 2000-2100 rpm, there is a little knock, depending on the throttle position. Is this related, or is it something else? Michael
i have the annoying as hell piston slap as well in my 2001 5.3 and it started around 98K. At about 104K, i started getting a little bit of pinging, and just switched to higher octane gas, and it went away completely. i still get the slap, but no more pinging, so i would venture to say that they are not related, but try a higher octane.
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