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5.3 Vortec with New Tapping noise
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Question
tmbm50
I have a 99 5.3l GMC Sierra with about 90k on it. It just recently starting tapping loudly for at least a few minutes during driving. Even if it's 75 outside it taps for the first few minutes. Synthetic Oil hasn't helped.
I don't think this is the "piston slap" considering it's just starting now and it last longer than the 10-15 seconds most people report.
Where should I start looking? I was told these vortecs don't have a conventional lifter so I can't look there.
Thoughts?
Tim
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