2013 GMC Sierra AFM disabler

[Kassie Moomey]

Just bought a '13 Sierra sle 5.3 and was informed of an occasional oil pressure light. Sure enough driving it home the pressure ran low. Did some research and learned all about the troubles with AFM. Ordered a disabler. With the AFM disabler active, is it safe to run with the stock oil pump?

[swathdiver]

5 hours ago, Kassie Moomey said:

Just bought a '13 Sierra sle 5.3 and was informed of an occasional oil pressure light. Sure enough driving it home the pressure ran low. Did some research and learned all about the troubles with AFM. Ordered a disabler. With the AFM disabler active, is it safe to run with the stock oil pump?

Absolutely safe.  I doubt that the "disabler" will cure your oil pressure being low at times.

 

To see if the pickup tube o-ring is bad, add two quarts of oil and idle the engine, if the pressure comes back up you know it's the o-ring. 

 

There is a bypass in the oil pan that can go bad though we rarely see that.  Same for the o-rings that seal the AFM solenoids in the VLOM to the AFM towers in the lifter valley. 

 

The screen under the oil pressure sensor can become clogged and should be cleaned or replaced and if "dirty", will show low oil pressure on the gauge, inexpensive fix.