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Got a small engine noise and I can't determine where it's coming from. I've changed the oil lately with Mobil 5w30 and some Lucas oil stabilizer. The only time I really hear the noise often is at low RPMs when the truck is in gear and the RPMs drop. In part you don't hear it often at all. I've crawled all over it and I feel like it's coming from the water pump. It's more center of the motor than being on top of the motor. It sounds like metal tapping metal. If you bump the RPMs the noise disappears but then comes back when they drop. Anyone ever had issues with the water pump impeller rubbing or tapping inside the housing?
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