I fixed this problem on my truck by changing the Oil Pump Inlet Tube O-Ring. The lifters are the first part that don't get enough oil after this o-ring breaks down. All Chevrolet mid 2000s era 5.3L O-Ring fails around 150-190K.
Oil Pump Inlet tube O-Ring Replacement
https://www.youtube.com/watch?v=g1e3kx3mOMY
SOURCE: 2001 chevrolet silverado z71
replace the front u joint. I had the same issue with my truck, and I noticed that the front u joint didn't come stock with a greese zerk, the oem replacement does so they wear out fast. by the time I found it, it still looked ok till I removed the drive shaft....It was very close to wearing through.
SOURCE: thermostat location 2001 chevy silverado 1500
The thermostat is in the hose on the passener side of the waterpump.It is in the part that has the three 10mm bolts.Please rate my answer, Thank you.
SOURCE: WHERE IS THE FUEL FILTER LOCATED?
located on the inside frame rail just under the drivers side door
SOURCE: 2000 silverado z71 service 4 wheel drive light on/off
The problem is with the front actuator.Its flashing in the dash lights because is not functioning properly.Replace actuator and fix problem.Its a 4 or 3 wire screw in plug in front axle,,
I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_a3369546f8067589
SOURCE: Lifter ticking when I start my 1999 Chevy Tahoe
Your lifters have become clogged over the years. Its only after the oil warms up and thins out does it allow oil to "pump up" the lifters. That's why it goes quiet after 5 min. There are several different brands of additives on the market that can fix this problem ,unless you have a more serious mechanical problem, which I doubt.Check your local auto parts store for the additive. Just add it to your oil and "wham!" problem solved. Good Luck!
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