Can a bad VLOM cause low oil pressure?

The oil should be changed after doing this since the cylinder heads will be off to replace the lifters anyhow. Low oil pressure to the VLOM can also cause AFM lifter damage.

How do I know if my DOD lifter is bad?

The symptoms of a cam or lifter failure usually involve a chirping, ticking, squealing or squeaking sound accompanied by a Check Engine light and engine misfire codes stored in memory.

Does AFM cause engine damage?

The AFM excessive oil consumption problem usually crops up on vehicles that go on long highway drives. These kinds of trips don’t put much stress on the engine, so the AFM system deactivates pistons. Then, at a certain point, excess ring and cylinder wear can lead to engine damage.

How does Chevy VLOM work?

The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve lifters.

Can VLOM cause low oil pressure?

GM has stated low oil pressure to the Valve Lifter Oil Manifold (VLOM ) can also cause AFM lifter damage. Generally, most known good vehicles will have around 25 PSI or greater oil pressure at hot idle with new engine oil.

Why do AFM lifters collapse?

We have found that most lifter faults are caused by oil pressure issues, or control issues. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve lifters.

Why do AFM lifters fail?

The most common reason for AFM Lifter failure can be attributed to the low oil pressure. Once you update them with the new ones, not only can you solve the failure issue, but also you can minimize common AFM related problems.

What causes DOD lifter failure?

Should I disable AFM on Silverado?

A V8 is always a V8. So, if you want your V8 to give you the beast-like performance, then shutting down the AFM opens your door for that. The AFM keeps half of the cylinders deactivated, and it doesn’t let the vehicle reach its true potential. This is why shutting the AFM down is important to return to that mode again.