For 1990-2009 cars

# COLD DRIVABILITY HARD COLD ST. 17081192/81198 CARBS

SHOULD COMMENTS OF COLD DRIVEABILITY BE ENCOUNTERED DURING THE FIRST MILE OR TWO OF DRIVING ON 1981 "A" SERIES MODELS EQUIPPED WITH THE 3.8 LITRE V6 (CODE A) ENGINES, ALL CHECKS AND INSPECTIONS NORMALLY RELATED TO SUCH CONDITIONS SHOULD BE MADE. FOREMOST AMONG THESE IS TO VERIFY THE CONDITION BY ROADTESTING WITH THE OWNER IF POSSIBLE. PRE-CHECKS THE FOLLOWING ADJUSTMENTS SHOULD BE CHECKED PRIOR TO ANY REPLACEMENT OF PARTS: CARBURETORS #17081192 AND #17081198 - FAST IDEL CAM/CHOKE ROD 1ST TYPE (HAS "AH" CAM) 24 1/2F + 2F 2ND TYPE (HAS "T" CAM) 18F + 2F - PRIMARY VACUUM BREAK 1ST TYPE (HAS "AH" CAM) 28F + 2F 2ND TYPE (HAS "T" CAM) 28F + 2F - SECONDARY VACUUM BREAK 1ST TYPE (HAS "AH" CAM) 24F + 3F 2ND TYPE (HAS "T" CAM) 24F + 3F - FLOAT LEVEL, USING J-9789-130 (REFER TO 1980 SERVICE MANUAL) 1ST TYPE (HAS "AH" CAM) 3/8" + 1/16" 2ND TYPE (HAS "T" CAM) 3/8" + 1/16" - SLOW IDLE SPEEDS: - MINIMUM AUTHORITY 450 RPM - REFER TO ATTACHMENT "A" - MAXIMUM AUTHORITY 900 RPM - REFER TO ATTACHMENT "A" : DO NOT ATTEMPT ADJUSTMENT CHECKS UNTIL FAMILIAR WITH PROCEDURE DESCRIBED IN ATTACHMENT "A" - NEUTRAL/PARK SWITCH ADJUSTMENT - REFER TO ATTACHMENT "B" - CHECK ALL HOSE ROUTINGS, INCLUDING VACUUM BREAK HOSES AND PURGE HOSE CONNECTIONS - REFER TO EMISSION CONTROL LABEL EVERY EFFORT SHOULD BE MADE TO DETERMINE EFFECTIVENESS OF THE CHANGES BY ROADTESTING AFTER AN OVERNIGHT COLD SOAK. IF THE DRIVEABILITY CONDITION CONTINUES, THEN IT WILL BE NECESSARY TO INSTALL THE NEW FAST IDLE CAM, THE NEW CHOKE COVER ASSEMBLY AND THE NEW SECONDARY VACUUM BREAK WHICH ARE INCLUDED IN CHOKE AND CAM KIT #17068034. FOLLOWING ARE PARTS INCLUDED IN THE KIT: * SEE BULLETIN *

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.