4.6L Oil pressure erratic
1995 Tbird with 4.6L SOHC 133,000 miles I've put the last 70K on her myself. Used 10W30 synthetic always. Engine uses 1/2 qt. every 3000 miles. Noticed lots of lifter noise last week @ morning start-up. Noted oil pressure lower than "n" in "norm". (Usually stays right at the "r") Drove it anyway. Problem persisted for a couple of days, then, the reading went back to the "r". Started-up OK this morning, then, this afternoon, same low oil pressure problem / noise. Pressure came back up after about 2 hours of driving.
Question: Where is the oil pressure regualtor/relief located? Is in in the Oil Filter adapter (like was done on the small block chevy?) I had one of those get stuck once and cause the same problem. Any other Ideas? With this many miles on the engine, I'll replace it before before spending alot of time (and money) doctoring a real problem. Thanks!