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Hello, is this the 4.0 SOHC engine and is the noise coming from the engine area?
Ok there are two differnt 4.0 engines an overhead valve OHV engine and a SOHC Single Overhead cam engine, just checking to see, if it is the SOHC engine it is most likely a noise from either one of the timing chains or an internal engine noise based on the mileage. All you can do is try to isolate the area of the noise to make sure it is not related to the engine itself.
Ok yes, most likely a worn timing chain guide. this engine uses 3 timing chains. A timing chain in the left front cylinder head for the camshaft, a timing chain in the rear of the right cylinder head for the right side and a jackshaft chain in the lower center of the engine to run the left and right side timing chain. if the timing chain jumps time or breaks, it will bend valves in the engine and big bucks to repair. the whole engine must come out in order to do the timing chains since the right chain is accessed from the rear of the engine.