A ticking noise may develop from the engine due to a cracked exhaust manifold. Damaged exhaust manifolds will require replacement to correct this issue.Google+
Car Problem Reports
Ford Explorer Exhaust Manifolds Can Crack and Cause Leak
Ford Explorer Problem
Exhaust & Emissions Affected: 5.0L V8
Average Mileage: 110,868 mi (73,450 mi - 180,000 mi)
after dealer replaced a cracked plastic radiator($360.00), and a drivers door actuator(260.00) , then one coil on one spark plug for about $300.00, all less than a year after replacing another(may be the same( coil and all the spark plugs ($960.00) I went tp get the car and was told the manifold had a problem and they wanted another $700 to repair/replace. I haven't had it done yet. The $700.00 just seemed to come to the lips of the service man too quickly.
Visitor, 2007 Ford Explorer, 73,450 mi
Same problem. Passenger side. Real pain in the but to fix and cost a nice chunk to have it done. Tons of reports all of the web about it but Ford won't own up and fix the issue. I repaired the problem by selling off my explorer, F350, and 3 E350 work vans and buying different make vehicles.
Visitor, 1998 Ford Explorer, 82,500 mi
Ticking noise from right (passenger) side of engine. Excessive heat under hood. Burning smell from under hood.
Visitor, 2006 Ford Explorer, 95,000 mi
Exhaust manafold is leaking. Shop is repairing now
Visitor, 1998 Ford Explorer, 76,000 mi
Passenger side exhaust manifold leak. $640 repair at dealer.