DIESEL ENGINE DIAGNOSIS SERVICE MANUAL UPDATE

THIS BULLETIN CONTAINS REVISED DIESEL ENGINE DIAGNOSTIC INFORMATION. PLEASE UPDATE YOUR 1982 SERVICE MANUAL TO INCLUDE THE CHANGES OUTLINED IN THIS BULLETIN.

I. CHART I, "ENGINE STARTS AND IDLES ROUGH WITH EXCESSIVE NOISE AND/OR SMOKE, BUT CLEARS UP AFTER WARM UP", UPDATES THE DIAGNOSTIC INFORMATION ON PAGE 6-11 OF THE 1982 SERVICE MANUAL.

SEE CHART I

II. CHART 2 ON THE REVERSE SIDE, "DIESEL ENGINE IDLE ROUGHNESS DIAGNOSIS PROCEDURE (CON'T)", UPDATES THE DIAGNOSTIC INFORMATION ON PAGE 6-16 OF THE 1982 SERVICE MANUAL.

III. CHART 3, BELOW, CONTAINS REVISED GLOW PLUG DIAGNOSTIC INFORMATION AND REPLACES THE "IF RELAY OPERATES" SECTION OF FIGURE 6A5-15 ON PAGE 6A5-16 OF THE 1982 SERVICE MANUAL.

IV. CHART 4 ON THE REVERSE SIDE, "GLOW PLUG RESISTANCE PROCEDURE" UPDATES THE DIAGNOSTIC INFORMATION ON PAGES 6-17 OF THE 1982 SERVICE MANUAL.

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.