Thread: Grinding noise at idle

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Maybe two separate problems? The grinding could be a cracked flex plate. The oil pressure drop and rise is a plain indicator of loose main bearings. It is conceivable that loose mains could cause vibrations that could crack the plate.

You didn't say what year truck. But if it has the one piece aluminum alternator,power steering,& A/C mount I would look there first,they where prone to cracking and would make a heck of a noise especially when you turned the A/C on.

it's an 82, non serpentine.....I'm thinking, flexplate/TC/trans front pump/crank-bearings.....the diagnosis starts tomorrow, thanks again for the help