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Old 12-25-2013, 03:10 PM   #2
buddy_1
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Join Date: Dec 2013
Location: Humble, Texas
Posts: 185
Re: 99 suburban valve mystery

Check oil level and pressure. Low oil level can cause this. Low oil pressure could be caused by a stuck pressure relief valve in the pump. I've had a couple of them that the screen would stop up due to loose carbon build up floating around in the pan. Buddy
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