A ticking type noise may be noted from the engine area due to an exhaust manifold that has cracked where the pipes are welded; cracked manifolds should be replaced.Google+
Car Problem Reports
Jeep Grand Cherokee Exhaust Manifolds Can Crack Where Pipes Are Welded
Jeep Grand Cherokee Problem
Exhaust & Emissions Affected: 4.0L 6 Cylinder
Average Mileage: 150,600 mi (90,000 mi - 230,000 mi)
Visitor, 1993 Jeep Grand Cherokee, 137,000 mi
I hear a ticking after start the car and while driving.
Visitor, 1993 Jeep Grand Cherokee, 230,000 mi
LOUD ENGINE TICKING JUST DOESNT RUN QUITE
Tick in exhaust manifold where weld appears to have cracked or split over the years. Problem not fixed.
cracked manifold, has to be replaced very time consuming and expensive over $1000
Visitor, 1996 Jeep Grand Cherokee, 165,000 mi
Cracked exhaust manifold at one of the weld points.