Ford Mustang 1999–2000 — technical service bulletin
Bulletin 14439 · NHTSA communication 620449 · issued Jan 1, 2000
Technical service bulletin
communication type
Engine and Engine Cooling
component
1999–2000
model years
2
vehicle entries
Official summary
Some vehicles equipped with a 3.8l engine may exhibit spark knock on heavy accel with 87 octane fuel. Hot weather and lower octane fuel may exaggerate the condition. *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.