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What should one look at to diagnose a decrease in oil pressure during normal operation of 1984 Chevy 305: At cold engine start oil guage reads 30-45 but when warmer oil guage reads 0?
Wiki User
∙ 18y ago
You need to have an oil pressure test run to determine if the oil pump is bad or the sending unit is defective. It could also just be a bad seal, or something to that effect. Check your oil fill cap and see if it is staying tight. It would make sense for the oil pressure to be higher at first when the engine is cold, because the oil would be thicker. Once it gets warmed up and thinner, the pressure should go down some, but not to zero.
Wiki User
∙ 18y ago
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