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2010 Silverado 5.3 has low oil pressure at cold start and…

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2010 Silverado 5.3 has low...
2010 Silverado 5.3 has low oil pressure at cold start and then after driving a little has no oil pressure...need help trouble shooting this problem don't want to replace oil pump for nothing
Submitted: 2 years ago.Category: Chevy
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Answered in 1 minute by:
2/21/2016
Chevy Mechanic: JOHN aka Eauto, The Car Guy replied 2 years ago
JOHN aka Eauto
JOHN aka Eauto, The Car Guy
Category: Chevy
Satisfied Customers: 17,072
Experience: ase tech
Verified

have you verified oil pressure with a external mechanical gauge
?

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Customer reply replied 2 years ago
No where can you connect one?
Customer reply replied 2 years ago
In the same hole as the oil pressure sensor?
Chevy Mechanic: JOHN aka Eauto, The Car Guy replied 2 years ago

correct the fitting adapter is part # ***** - Oil Pressure Adapter http://www.handsontools.com/Kent-Moore-J-21867-6-Adapter-Oil-Pressure-Gauge-J21867-6_p_21132.html

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Customer reply replied 2 years ago
Can you do this with out removing intake?
Chevy Mechanic: JOHN aka Eauto, The Car Guy replied 2 years ago

yes but its a bare to get in there but it can be done yes..

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Customer reply replied 2 years ago
I already put a new oil pressure sensor in nothing changed still did same thing
Chevy Mechanic: JOHN aka Eauto, The Car Guy replied 2 years ago

well its the best way to verify if its truly weak oil pressure or gauge or sender issue. are you the original owner? do you know the maintenance history since day 1?

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Customer reply replied 2 years ago
No i just got the truck
Customer reply replied 2 years ago
If the oil pressure readings are correct what would the next step be?
Chevy Mechanic: JOHN aka Eauto, The Car Guy replied 2 years ago

how many miles? any engine noise? any lights? any signs of sludge or lack of maintenance?

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Customer reply replied 2 years ago
Around 110,000 no lights besides the oil pressure i changed the oil and filter as well. The oil that came out was black. Should i try flushing the motor with something?
Chevy Mechanic: JOHN aka Eauto, The Car Guy replied 2 years ago

I would generally I flush by putting 50 percent oil and 50 percent tranny fluid and drive it around a few days...it cleans the motor real well

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Customer reply replied 2 years ago
Ive heard of that before... What else could it be besides sludge causing the oil pressure drops
Chevy Mechanic: JOHN aka Eauto, The Car Guy replied 2 years ago

oil pump sludge or internal bearing failure rod or main bearings

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Customer reply replied 2 years ago
Ill try flushing it and then mechanical guage oil pressure and if its really got oil pressure dropping out then the motor is shot?
Chevy Mechanic: JOHN aka Eauto, The Car Guy replied 2 years ago

well it could be oil pump and or bearings...tear down to find extent of damage or motor replacement would be the next step

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Customer reply replied 2 years ago
Ok ill see what happens could you send me the procedure for replacing oil pump?
Chevy Mechanic: JOHN aka Eauto, The Car Guy replied 2 years ago

is it 4x4?

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Chevy Mechanic: JOHN aka Eauto, The Car Guy replied 2 years ago

its a big job 8.5 hours

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Customer reply replied 2 years ago
Sounds like fun
Chevy Mechanic: JOHN aka Eauto, The Car Guy replied 2 years ago

Please remember to only rate my service when you are satisfied. IF you feel the need to rate "Poor Service" or "Bad Service", please stop and reply to me via the REPLY TO EXPERT button with the issue you have. I will be happy to continue further and do everything I can to provide you with the service you seek.

I am not paid unless I get a rating of 3 to 5 Stars/Smiley Faces. If I have helped you with your question, please give me an appropriate rating so that I get credit for helping you

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JOHN aka Eauto
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JOHN aka Eauto, The Car Guy
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