1997 General Motors (Chevrolet/Geo, Pontiac, Oldsmobile, Buick, Cadillac and GMC) Inspection/Maintenance (I/M) Emissions Diagnostic Manual Pre-OBDII. ORIGINAL
Developed by General Motors this manual provides emissions diagnostic information applicable to open and closed loop carbureted, throttle body injection (TBI), multiport fuel injection (MFI), and the major emission control systems found on General Motors vehicles. The procedures outlined in this manual, as well as the procedures referenced in the applicable vehicle service manuals, apply to both the Basic and Enhanced Inspection/Maintenance (I/M) programs. An understanding of the material presented in this manual, along with the diagnostic and repair procedures presented in the applicable vehicle service manuals, and the appropriate Dealer Technical Service Bulletins, will assist service technicians in diagnosing and servicing vehicles with excessive tailpipe and EVAP system emissions.
Appropriate service methods and procedures are essential for the safe, reliable operation of all motor vehicles as well as the personal safety of the individual doing the work. This manual provides general directions for performing service with tested, effective techniques. Following them will help assure reliability. There are numerous variations in procedure, techniques, tools and parts for servicing vehicles, as well as in the skill of the individual doing the work. This manual cannot possibly anticipate all such variations and provide advice or cautions as to each. The descriptions and specifications contained in the manual were in effect at the time of publication. Note: These manuals were never meant as restoration manuals, as that is not within the regular scope of work done by dealership service departments.
All GM Passenger Cars and Light Duty Trucks
Enhanced Inspection/Maintenance (I/M) Program
Engine Emissions and Emission Control Strategy
I/M 240 Strategy Based Diagnostics
Closed Loop Carbureted Emissions Diagnosis
Closed Loop TBI Emissions Diagnosis
Closed Loop MFI Emissions Diagnosis
Condition: Service Manuals are used in Dealership Shops, Independent Garages and in Fleet Environments and thus can reflect such use, most often showing extensive signs of soiling, age, and wear. Condition can vary from those shown, but the information within is still legible and can give valuable insight.
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