Ford Explorer 1997 — technical service bulletin
Bulletin BC3494972301 · NHTSA communication 51487 · issued Jan 23, 1997
Technical service bulletin
communication type
Engine and Engine Cooling
component
1997
model years
2
vehicle entries
Official summary
Various vehicles may experience a high pitched whistle during heavy acceleration at 3800-5000 rpm when engine is warm- to fix, remove existing muffler and replace with same part. *jd
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.