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Re: 1991 chevy 2500 engine knock
Oil pressure low?
There's a bunch of possibilities
Loose or cracked flexplate
Defective engine-driven fuel pump (your vehicle probably doesn't have an engine-driven fuel pump)
Defective belt-driven accessory such as an A/C compressor
Bent oil shield or dipstick tube hitting the crankshaft or connecting rods
The most-likely situation is a defective bearing for a connecting rod.
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