Question about 1993 GMC Sierra K1500

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Low oil pressure 93 GMC P/U w/350 motor w/205,000 miles gauge

93 GMC P/U w/350 motor w/205,000 miles gauge reading low oil pressure and check gauges light flashes at idle. Idle is rough but truck runs good when driving. just changed the oil and gauge reads the same. pressure reads less than 15 when driving.

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  • Crystal Campos May 12, 2013

    Thank you so much this have been very helpful and much appreciated

  • Anonymous Mar 15, 2014

    light flashes low oil pressure

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While engine is running, open the cover where you add oil to engine and see if you see a good flow of oil, if good flow, could be as easy as replacing oil sending sensor. got to realize that if poor maintenance history your engine may not be building enough pressure at iddle to move your hydraulic operated valves, only when you rev it up it will pump enough to run smooth. if running engine too long, you may cause more damage to other engine components such as crankshaft and cam shaft bearings. if you can spare a few bucks, have a good mechanic check your oil pressure with a mechanical gauge. another cheap option is to replace oil pump. last resort if you love your truck as much as we do,replace engine or rebuild it. At 205,000 this is a normal symptom, other than timing chain problems, most engines don't make it that far. hope this helps!

Posted on Mar 01, 2010

  • susanb Jun 18, 2013

    that sounds good but the engine supposedly has been rebuilt and only has 300 miles

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