Low to no pressure at start with knock sound

Asked by Jun 05, 2016 at 08:36 PM about the 1999 GMC Sierra 1500 SL Extended Cab LB

Question type: Maintenance & Repair

I have a 99 GMC Sierra 1500 4.8l.  past couple
days when I first start it there will be atapping
sound and the oil pressure gauge will be at zero.
After a few seconds the oil pressure will rise and
the tapping sound disappears. Only does it at
startup. Runs fine after. What could be the issue?
Thank in advance

2 Answers

20,420

Change oil and add some Lucas Engine Oil Stabilizer to it worked for me when I had the same problem.

OK thank you for the advice

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