'99 5.7

By SharpTruck
June 14, 2010 in 1999-2013 Silverado 1500 & Sierra 1500

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SharpTruck

Posted June 14, 2010

First off, just want to say I love this site! Anyhoo, I have a '99 Sub.4X4 with a 5.7 Vortec. Yes, its been a beast and been thru alot.....I have lost my oil pressure. Its good when its cold but as soon as it warms up it drops. About 190K on mileage, I run synthetic and change every 3k. At idle warm it drops to CEL comes on.At highway speeds runs about 20psi. I have already changed out the oil sending unit, same thing.Help me out if you can.....Thanks in advance!

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