Problems with 2008 5.3

[David_L6]

Truck is a 2008 Silverado with a 5.3 with ~79000 miles on it. Never had any problems with it the first 4 years I owned it. I've never had the oil consumption problem that others have had.

 

A week ago the oil pump went out. Dealership replaced the oil pump and 2 days later the oil pressure was all over the gauge, check engine light was on, and truck idled rough. Dealership said that it was lifters and cam and they replaced both.

 

Now the oil pressure runs both lower and higher than it used to. It used to run right around 40 all the time. Little lower at idle and a little above at highway speeds. Now it runs about 22 at idle, 38 at highway speeds, and jumps up to about 58 if you get the RPMs up while passing, etc.... What's the deal???

 

I have 3 Silverado trucks. A '99 with a 4.8, this 2008, and a 2012 with a 6.2. Until this problem with the '08 they all had oil pressure right around 40 all the time. Never much below or above 40.

[Duelin]

Did they replace the cam bearings when they replaced the cam? If they didn't that could be your problem.

[David_L6]

Did they replace the cam bearings when they replaced the cam? If they didn't that could be your problem.

 

 

I don't think so.

[GMstrong]

i would replace the oil pressure sending unit/switch.

[00Silverado4x4]

Mine has recently started doing the same exact thing (although mine is older generation.) I haven't done anything to fix mine since I don't get any warning lights and my oil level is closely watched. So if you find a fix let know.