TIMING ADJ. PROCEDURE BASE ENGINE TIMING

Subject: TIMING ADJUSTMENT PROCEDURE - 1981 AND 1982 VEHICLES

Included in this bulletin is a chart describing procedures required to set base engine timing on all 1981 and 1982 General Motors engines.

The information provided is basic and the vehicle tune up label, located in the engine compartment, should be referred to whenever making engine adjustments.

TIMING ADJUSTMENT PROCEDURE

1981 1982

VIN VIN CODE ENGINE PRODUCER PROC. CODE ENGINE PRODUCER PROC.

A 3.8L Buick 1 A 3.8L Buick 1 F 4.3L Olds. 1, 8 C 1.6L Chev. 3 H 5.0L Chev. 1 E 3.OL Buick 1 J 4.4L Chev. 1 G 1.8L Chev. 1 K 3.8L Chev. 3 H 5.OL Chev. 1 L 5.7L Chev. 1 J 4.4L Chev. 1 S 4.3L Pont. 4 K 3.8L Chev. 2 T 4.9L Pont. T 4 L 5.7L Chev. 1 W 4.9L Pont. 4 R 2.5L Pont. 2 X 2.8L Chev. 1 X 2.8L Chev. 1 Y 5.0L Olds. 1, 8 Y 5.OL Olds. 2, 8 Z 2.8L Chev. 1 Z 2.8L Chev. 1 3 3.8L Buick 1 0 1.8L Pont. 2 4 4.1L Buick 1 1 2.8L Chev. 1 5 2.5L Pont. 1 2 2.5L Pont. 2 6 5.7L Chev. 1 3 3.8L Buick 1 9 1.6L Chev. 1 4 4.1L Buick 1 9 6.0L Cad. 7 7 5.0L Chev. 5 6 5.7L Chev. 1 8 4.3L olds. 2, 8 8 5.7L Chev. 5 8 4.1L Cad. 6 9 6.0L Cad. 7

1. Disconnect four wire EST connector. 2. Ground test terminal in connector under dash. 3. Disconnect distributor vacuum advance hose. 4. Ground distributor bypass pigtail (blue conn 5. Disconnect bypass connector (tan/black wire). 6. Disconnect green reference signal connector. 7. Open "set" timing connector. 8. Set timing at 1100 rpm.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.