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-250 Loud Popping Noise and Misfire Experienced
Ford E-250 Problem
Engines Affected: 4.6L V8, 5.4L V8, 6.8L V10
Average Mileage: 144,333 mi (98,000 mi - 175,000 mi)
Visitor, 1998 Ford E-250, 5.4L V8, 175,000 mi
2 spark plugs blew out of head and lost threads.