Skylark V6-173 2.8L VIN X 2-bbl (1984)
PROM - Programmable Read Only Memory: Customer Interest
Engine - Detonation or Chuggle
Bulletin 86-6E-21
Date
Jan. '87
Ref. No. 86-196-6E
SUBJECT:
ENGINE DETONATION OR CHUGGLE
MODELS AFFECTED: 1983-85 SKYLARKS AND 1986 CENTURYS WITH LE2 2.8L V-6 ENGINES (VIN CODE X), 3 SPEED AUTOMATIC
TRANSMISSIONS, AND FEDERAL EMISSIONS
Some 1983-85 Skylarks and 1986 Centurys equipped with 2.8L V-6 carbureted engines may exhibit engine detonation or chuggle upon TCC apply. If
normal service procedures in the Service Manual (Section 6E1, Section B) do not correct the condition, new service PROMS with revised calibrations
are now available from GMSPO.
MODEL
EMISSIONS
SERVICE
YEAR
MODELS
TRANSMISSION
CALIBRATION
PROM
1983
Skylark
3 Speed Auto.
Federal
1228323
1984
Skylark
3 Speed Auto.
Federal
1228325
1985
Skylark
3 Speed Auto.
Federal
1228326
1986
Century
3 Speed Auto.
Federal
1228326
Use applicable Labor Time and Labor Operation Number for PROM replacement.
