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350 chevy oil pressure drops rapidly after starting.

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Old 06-17-2011, 07:11 PM   #1
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Default 350 chevy oil pressure drops rapidly after starting.

Hey I working on a 94 chevy 1/2 ton 4x4 I start it up and it has 40-50 psi oil pressure then after 5-10 seconds it rapidly drops to 2-5 psi and stays there.

Could it be a pick up tube? Oil pump? other problem??

Thanks
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Old 06-17-2011, 07:18 PM   #2
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the engine is cold. Don't want to run to long before I figure this out.
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Old 06-17-2011, 07:39 PM   #3
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try the pressure sending unit 1st, they can go bad
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Old 06-17-2011, 09:36 PM   #4
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new sender is in it. and tried a manual gauge also. all ready the same.

going to pull the pan soon to see if the pick up tube is there. maybe tomorrow.
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Old 06-19-2011, 07:09 PM   #5
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Check the oil pump...

Could be a broken pressuer spring, or just a bad pump.

When the pick up falls off usually the pressure stays good till your driving and on the brakes.
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Old 06-19-2011, 09:15 PM   #6
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thanks for the reply's

I found the pickup tube fell off.
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Old 06-19-2011, 10:58 PM   #7
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well damn, was that with a stock pan? alsowas it low on oil? usually only see the pressure loss and/or drop when on the brakes.
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Old 06-19-2011, 11:04 PM   #8
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It was a little low. not sure how much. Drained it when I pulled the pan. and refilled it with the 5 quarts.
Yea stock pan.
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