Small Block & Big Block Chevy Specific - 350 chevy oil pressure drops rapidly after starting.




1Hotbird
06-17-2011, 07:11 PM
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


1Hotbird
06-17-2011, 07:18 PM
the engine is cold. Don't want to run to long before I figure this out.

1dirtybird
06-17-2011, 07:39 PM
try the pressure sending unit 1st, they can go bad


1Hotbird
06-17-2011, 09:36 PM
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.

1dirtybird
06-19-2011, 07:09 PM
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.

1Hotbird
06-19-2011, 09:15 PM
thanks for the reply's

I found the pickup tube fell off.

1dirtybird
06-19-2011, 10:58 PM
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.

1Hotbird
06-19-2011, 11:04 PM
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.