1999 Pontiac Grand Prix Oil Pan Removal

I completed this repair last night. The unidentified object turned out to be the bottom side of the Right Side Lower Engine Mount.

Oil Pan Removal Procedure (Modified):
1. Disconnect negative battery cable. Carefully remove throttle body air inlet duct. Disconnect one side of upper engine torque struts. Remove serpentine belt. Install the Engine Support Fixture.
2. Raise and support vehicle using floor jacks positioned directly behind Engine Frame. Remove both Front Tire and Wheel Assemblies. Remove Right Engine Splash Shield. Drain Engine Oil.
3. Remove A/C Compressor and position aside (2 Bolts on pulley side & 3 Bolts on other side). Disconnect the power steering oil cooler pipe brackets from the Engine Frame.
4. Remove flywheel cover. Disconnect Oil Level Sensor Electrical Connector. Remove Oil Level Sensor.
5. Remove 4 Frame Insulator Bolts (Re-Tighten Bolts to 142 lb. Ft.). Lower Engine Frame.
6. Remove Right Side Lower Engine Mount (4 Bolts) & Bracket (5 Bolts); Left Side Frame Mount (2 Bolts).
Remove Oil Pan Retaining Bolts (Re-Tighten Bolts to 124 lb. In.). Remove Oil Pan. Remove Oil Pan Gasket.
7. To install, reverse removal procedure. Tighten all fasteners to specification. Fill Crankcase.

After my oil pan was removed, I replaced the (thought to be clogged) Oil Pump Pipe & Screen Assembly (Re-Tighten Bolts to 132 lb. In.). Unfortunately, I still have the Engine Valve Noise that began very soon (150 miles) after Upper Intake Manifold (plastic cover) Replacement. I had hoped it was caused by low oil pressure (this car has no oil pressure guage).

What did you find was the issue? I have the same problem