What would cause 92 gmc sonoma 4.3 to knock and oil pressure to fluctuate and drop as it heats up?

Asked by oldtruckguy69 Jun 03, 2017 at 01:43 PM about the 1992 GMC Sonoma 2 Dr SLE Standard Cab SB

Question type: Maintenance & Repair

Engine started to knock and drop oil pressure. Knock speeds up as You
accelerate. The oil pressure starts out fine and then flucuates then drops as it
heats up. Cant decide if its a rod a bering a stuck lifter or the oil pump. Engine
has 150k miles.

1 Answer
3,550

Lonetech answered 6 years ago

Pull pan and check pickup tube. If clean and while you're in there go ahead and change oil pump. If a lot of sludge is in oil pan. Flush engine as well

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