EXPERTEC TSB (85-217)

EXPERTEC TSB

TECHNICAL SERVICE BULLETIN

HES./SAG COLD/ SURGE WARM - INSTALL REVISED ECM AND PROM

Model(s): 1985 Chevrolet Spectrum

Bulletin No.: Chevrolet 85-217

Date: 12/19/1986

MODEL AND YEAR

1985 SPECTRUM

SERVICE INFORMATION

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.

BULLETIN ILLUSTRATION LIST

PARTS INFORMATION

To further improve engine driveability on automatic transmission cars, the following part should also be obtained from GMSPO and installed: pump arm kit-accelerator, P/N 94426520 as shown in illustration.

Use existing labor time.

ACCELERATOR PUMP LINKAGE REPLACEMENT

1. Move air cleaner forward about 7" (remove vacuum hoses as required). 2. Replace accelerator pump linkage. See illustration.