00 Pontiac Gran Prix 3800 series 2. Engine back from machine shop all spec'd out with mic's and plastigauge. I assembled with all new parts minus pistons, valvetrain and 4 rods. Summit Racing Stock rebuild... No fancy stuff. At startup I have no oil pressure. So shut down and research tells me that maybe the white lithium grease I packed in the new pump assy. is plugging it? I hope.... IS there any oil galley plugs I or machine shop may have overlooked? Like the LS motors next to oil pump?

Asked by May 24, 2015 at 09:42 PM about the 2000 Pontiac Grand Prix GT

Question type: Maintenance & Repair

No oil pressure / flow at initial startup. after 30 sec. crank to prime system. I fired and ran beautiful except valvetrain clatter. shut down after thirty seconds no change. new oil pan, new pickup tube, new pump assy. gasket and Loctite tube.. packed pump gears and passage with white lithium grease to lube and prime. Worried and frustrated and broke til payday.

1 Answer

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The oil pump assembly should be packed with petroleum jelly (aka Vaseline) not white lithium grease as per pages 6-351 & 6-352 of the 2000 Grand Prix shop manual. If after doing that, pressure does not immediately build, you'll have to drop the oil pan and inspect the pick up screen and tube assembly. I'd also inspect the bypass valve, at the oil filter adapter, for sticking or damage. If unsure of it's condition, replace it. HTH. -Jim

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