Jeep Wrangler 1989–1990 — technical service bulletin
Bulletin RCL647 · NHTSA communication 46153 · issued Oct 1, 1995
Technical service bulletin
communication type
Engine and Engine Cooling
component
1989–1990
model years
2
vehicle entries
Official summary
Applies to vehicles equipped with a 4.2l engine and federal high altitude emission control system. Fuel vapors may cause deterioration of the pcv harness assembly. The pcv harness assembly must be replaced and the engine idle speeds must be reset.
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.