The spark plugs may become dislodged from the cylinder heads. A loud popping noise can be heard and a subsequent misfire experienced. The threads on the spark plug ports in the cylinder head(s) can become stripped or missing when the spark plug is dislodged. The threads in cylinder heads may be replaced using “Lock-N-Stitch” aluminum inserts. Our technicians tell us thread replacement is performed when the vehicle is out of base warranty. Vehicles under base warranty receive a new cylinder head.Google+
Car Problem Reports
Ford E-150 Loud Popping Noise and Misfire Experienced
Ford E-150 Problem
Engines Affected: 4.6L V8, 5.4L V8
Visitor, 2001 Ford E-150, 5.4L V8, 105,000 mi
Blew out #3 spark plug. Also broke the spark plug wire coil bracket when it got kicked out. Looking for solution now.