I have a 05 Jeep Grand Cherokee 4.7 engine. This past Sunday I started it up and it was really loud, then there was this ticking/tapping noise. It sounds awful when you drive off but after a couple of minutes, the noise goes away. It seems to only do it when the engine is ''cold''
I had what sounds like the exact same problem. It was an exhaust leak from the left (driver's) side exhaust manifold. This engine has a history of the manifold bolts breaking and causing the exhaust leak. The engine is also used on some Dodge vehicles. It sounds like a tick and I almost mistook it for a bad lifter. I took it to the local Jeep dealer who confirmed the exhaust leak. I replaced the left manifold completely and replaced bolts/gaskets on both sides (left/right) and it fixed the problem. Be careful, as the dealer tried to gouge me on the price. You are looking in the ball park of $600 parts/labor. I got parts for $120 and it took the better part of a work day to do the job.
I do not believe this is the problem as my 05 4.7l jeep cherokee does the same thing. the noise is very loud and lasts about 10-15 seconds and originates from inside the dash. i had a friend who is a jeep mechanic take a look and he stated it was a vacuum leak for the "switchover door" to the A/C system. Some jeeps also have this noise problem from the passenger side near the blower motor behind the glove box. This is a problem that needs immediate attention as vacuum leaks will only get worse. it may also be accompanied by problems with air direction (i.e. defrost, feet, face etc..) as mine would only blow from the feet and defrost vents.
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Could be hydraulic tappet noise try engine flush and new oil of the proper grade new oil filter and try an additive designed for hydraulic tappets
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