Spectrum L4-91.5 1.5L (1985)
Engine Control Module: Customer Interest
Engine Controls - Driveability, Hesitation, Sag or Surge
Number:
85-217
Section:
6E
Date:
JAN., 1987
Subject:
HESITATION, SAG OR SURGE-ENGINE DRIVEABILITY CONDITIONS
Model and Year:
1985 SPECTRUM
TO:
ALL CHEVROLET DEALERS
Some of the subject vehicles may experience engine driveability complaints of hesitation or sag when operating under cold engine conditions and surge
at warm engine operating temperatures.
In order to effect an improvement, a revised ECM was introduced. Complaint vehicles can be corrected using this ECM per the following information:
AUTOMATIC TRANSMISSION - VIN prior to F8421857
Use controller - ECM P/N 1227077, with calibrator 1227729
VIN F8421857 and later:
Replace existing PROM with
calibrator, 1227729.
MANUAL TRANSMISSION -
VIN prior to F8422417
Use controller - ECM P/N 1227077, with calibrator 16051549
VIN F8422417 and later: No additional correction needed.
Current Accelerator Pump Linkage