Question about 2002 Pontiac Grand Am

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What causes no oil to lifters?

Full of oil yet nothing going to lifters, also sounds like it jumped time. Has 3400 motor

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Has the eng ine had any internal work done prior to this problem ? it is also possible that the oil pickup screen in sump is blocked. How old is the oil? Is it the correct grade of oil?

Posted on Nov 29, 2014

Testimonial: "Heads rebuilt about 1 year ago, oil was due to be changed. Really good car till now, still runs just runs very rough."

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Defective oil pump, clogged galleries and obvious low oil levels

Posted on Nov 29, 2014

Testimonial: "Oil level is good, just not sure if it was sending unit or bad pump. Looking at the weep holes at the lifters , no oil coming out at all, thank you for you response"

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