Question about 1999 Pontiac Grand Am GT

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Intermediate knock on 1999 Pontiac Grand Am does not happen all the time sometimes can drive for a hundred or so miles with out hearing the knock then comes back have removed serpentine belt and ran without and knock is still there so eliminated pulleys, belt tensioner and AC compressor not setting any codes at all nock does get faster with rpms being raised and then goes away after you get it over 2000 rpms Stumped??? Please help?

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Most likely lifters but other items that can do that are rocker arms, and piston slap.

Posted on Apr 06, 2011

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Posted on Jan 02, 2017

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If im correct i beleive those engines have hydraulic lifters in them. Thats probably whats making the noise. it's useless to replace them. It's not gonna affect your engines performance. just let it knock

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