Ignition/Emission System - Revised Diagnosis Procedure
Bulletin 86-6E-18Date Oct. '86
Ref. No. 86-180-6E
SUBJECT: REVISED IGNITION SYSTEM AND EMISSION CONTROL DIAGNOSTIC PROCEDURES
MODELS AFFECTED: 1986 RIVIERAS EQUIPPED WITH 3.8L SFI ENGINES (VIN CODE B)
Certain ignition system and driveability condition diagnostic procedures have been revised for 1986 Rivieras equipped with 3.8L SFI engines. The shaded areas of these procedures designate where changes were made.
Please update the following pages of your 1986 Buick Chassis Service Manual with this revised information:
1. Chart A-5 on Page 6E3-A-21.
2. The "EGR System Fault" information on Page 8D1-28 and Diagnostic Chart on Page 8D1-29.
3. Step 1 under Test Description on Page 8D1-30.
4. Mass Air Flow Sensor Code E033 Diagnostic Chart on Page 8D1-31.
5. Step 1 and 2 under Test Description on Page 8D1-32.
6. Mass Air Flow Sensor Code E034 Diagnostic Chart on Page 8D1-33.
7. The Cam Sensor Circuit Failure Diagnostic Chart on page 8D1-41.
8. The C(3)I EST or Bypass Circuit Failure Diagnostic Chart on page 8D1-43.