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1999 GMC sierra oil pressure guage reads erratic
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Question
xm22rx
Hi i own a 1999 gmc sierra with a 5.3l and automatic trans the truck has 199,000 miles and ive had no mechanical issues with it the whole life of the truck. There is one thing that does concern me approximately 50,000 miles ago the oil pressure guage started reading eratic at first it would just vibrate rapidly around its normal range it did that for awhile but now in the last 10,000 miles its still doing the rapid bouncing but now at idle it dips down to the 40 mark on the guage until the rpms are brought up then it comes up on the pressure reading. IIve heard that these engines had weak oil pumps? I dont know if thats true or not. Does this sound like a bad pump or guage or? Thanks for you time.
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