Engine - Low Speed Driveability or Detonation

Number: 93-122-6E
Section: 6E
Date: MARCH 1993
Corporate Bulletin No.: 276110R
ASE No.: A1, A8

Subject:
DRIVEABILITY IMPROVEMENTS

Model and Year:
1991-93 CAPRICE WITH 5.0L AND 5.7L ENGINES

ENGINE APPLICATIONS:
5.0L and 5.7L
(RPOs L03 and L05)

SUBJECT:
Driveability Improvements
(Detonation) - New Calibration

ENGINE VIN (MODELS):
E and 7

VEHICLE APPLICATIONS:
1991-93 Model Year B cars

THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 92-112A-6E, DATED NOV. 1992. THE 1993 MODEL YEAR HAS BEEN ADDED FOR VEHICLES FOR BROADCAST CODE BCDU, SCANNER I.D. 1391, P/N 16181390, 5.0L B CARS. ALL COPIES OF 92-112A-6E SHOULD BE DISCARDED.

CONDITION:

Some owners of 1991-1993 model year B cars with either the L03 (VIN E 5.0L V8) or L05 (VIN 7 5.7L V8) engine may comment on low speed driveability or engine detonation (spark knock).

CORRECTION:





The calibrations have been refined to address these concerns. If, after completing normal diagnostics, the condition remains, replace the PROM with the appropriate one from the table below:

NOTE:
For L03 B-car only, make certain the vehicle has been updated with the previously attempted service fixes as follows.

DESCRIPTION PART NUMBER
EGR Valve 17090156 (Stamped on Valve)
17112373 (GMSPO Kit)

PCV Valve 25098542

ESC Module 16175099
Broadcast Code (BARC)

Parts are currently available from GMSPO.

SERVICE INFORMATION:

Labor Operation: T0500

Labor Time: B Car 0.5 hour