Ford Econoline 1997–1999 — technical service bulletin
Bulletin 4981 · NHTSA communication 615321 · issued Dec 1, 1998
Technical service bulletin
communication type
Engine and Engine Cooling
component
1997–1999
model years
15
vehicle entries
Official summary
Some vehicles equipped with 5.4l engines may exhibit a cold start engine knock concern until warmed up. *tt
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.