my 1989 chevy pu 350 gauge light comes on & psi gauge drops 5

Reply Sat 5 Dec, 2009 08:30 pm
after truck warm up red check gauge light comes on . I have 90,000 miles on truck. notice oil psi drop down 5 then I reave up go back up 30 drop to 0 to 5 in idle . oil pump ?
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Reply Sat 5 Dec, 2009 09:39 pm
@rich pit,
check oil level? check oil puddles under engine? check oil pressure sendi ng unit?
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Reply Sat 5 Dec, 2009 09:44 pm
first stop is oil level. Then oil pump.
Could also be the pressure gauge.
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Reply Sat 5 Dec, 2009 11:07 pm
@rich pit,
the check gauges light is triggered when the oil pressure drops to less than 5 lbs.

sounds like when the engine gets to operating temp the oil is not thick enough to stay where it needs to be (usually main bearings)

assuming you are full of oil, I would try changing it out, and running a heavier straight weight oil (depending on your climate)

an oil pump might gain you some time, but I doubt it makes it all better.

also double checking the oil pressure with a remote mechanical gauge is not a bad idea. the sender on those is sometimes wack...

good luck.
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Reply Thu 8 Dec, 2011 02:40 pm
@rich pit,
is your motor diesel or gas ?
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