Ford Ranger 1998–1999 — technical service bulletin
Bulletin 6321 · NHTSA communication 606801 · issued Jun 1, 1999
Technical service bulletin
communication type
Engine and Engine Cooling
component
1998–1999
model years
2
vehicle entries
Official summary
Some vehicles may exhibit spark knock under acceleration. *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.