The Malfunction Indicator Lamp (MIL) ON and/or an engine misfire/tick noise. The DTC P0300 set or in history.
This may be caused by one of the following conditions:
Inspect the camshaft for damage while the lifters are removed from the engine. If damage is found, replace the camshaft.
If service information diagnosis does not isolate the cause of this concern, the valve operation should be inspected.
If the valve(s) are not moving, replace the valve lifter oil manifold and affected bank of AFM lifters.
If the lifter has spun the bore, the guides should also be replaced.
There are two approved processes for removing the lifter when stuck in the bore:
1. Use vice grips with a slide hammer.
Note: Be sure NOT to pry on the sealing surface of the block, as shown in the illustration below.
2. Use vice grips with a small pry bar.
Typically, one of the above approved processes will remove the lifter that is stuck in the bore. If not, the engine will need to be replaced.
With the lifter removed, be sure to inspect the bore for any damage. Typically, the lifter bores will look good with no indication of damage.