The outer exhaust manifold studs can break and cause exhaust leaks, commonly noted as a ticking type noise. The outer studs, clamps, and nuts will need to be replaced and are now being tightened to a reduced torque value (20 Nm/180 in lbs).
Car Problem Reports
Jeep Wrangler Broken Exhaust Manifold Studs
Jeep Wrangler Problem
Exhaust & Emissions Affected: 2.5L 4 Cylinder
Average Mileage: 92,500 mi (45,000 mi - 140,000 mi)
Start making exhaust leaking noise when cold, goes away when warm. Back stud broken off.
Visitor, 1990 Jeep Wrangler, 45,000 mi
yup actually i own a 1988 jeep wrangler and have had the issue for many years