For 1990-2009 cars

# PROPANE ENRICHMENT CARBURETOR ADJUSTMENT UPDATE

#### NOTICE: PROCEDURE FOR IDLE MIXTURE ADJUSTMENT WITH PROPANE ENRICHMENT IS COVERED IN DETAIL ON PAGES 6C-110 AND 6C-111 OF THE 1981 PASSENGER CAR AND LIGHT DUTY TRUCK SERVICE MANUAL SUPPLEMENT PRODUCED BY GM OF CANADA. 1981 PASSENGER CARS ENG.,(CODE),(CARLINE) TRANS. RPM INC. OVER CURB IDLE WITH PROP. ENR. 5.7L, (L), (F) AUTO 50 5.7L, (L), (F) MANUAL 100 5.0L, (H), (F) AUTO 15-35 5.0L, (H), (AWAG., B) AUTO 30-50 5.0L, (H), (A) AUTO 30-50 4.9L, (T), (F) AUTO 40-50 5.0L, (Y), (B,C) AUTO 30-50 5.0L, (Y), (E) AUTO 30-50 3.8L, (A), (A,B) AUTO 50-70 5.7L, (B), (C) AUTO 40 3.8L, (3), (E) AUTO 100 3.8L, (3), (A) AUTO 65 3.8L, (K), (A) AUTO 30-50 4.4L, (J), (A,B,F) AUTO 20-40 2.5L, (5), (X) AUTO 50 2.5L, (5), (X) MANUAL 150 2.8L, (X), (X) AUTO 75 2.8L, (X), (X) MANUAL 75-100 1.6L, (9), (T) AUTO 40-60 1.6L, (9), (T) MANUAL 75-125 1981 LIGHT DUTY TRUCKS ENG.,(CODE),(TYPE) TRANS. RPM INC. OVER CURB IDLE WITH PROP. ENR. 5.7L, (L), (C,K) AUTO 40-60 5.7L, (L), (C,K) MANUAL 170-200 5.7L, (L), (G) AUTO 40-60 5.7L, (L), (G) MANUAL 170-200 NOTICE: ADD THE FOLLOWING CARBURETOR SPECIFICATIONS TO PAGE 6C-72 OF THE 1981 PASSENGER CAR AND LIGHT DUTY TRUCK SERVICE MANUAL SUPPLEMENT. MODEL 17081172 FLOAT LEVEL 9/32" PUMP ROD 5/16" PUMP ROD LOCATION INNER CHOKE ROD CAM ADJ. 20F VAC. BK. FRONT 25F VAC. BK. REAR NOT APPLICABLE UNLOADER 38F MODEL 17081173 FLOAT LEVEL 9/32" PUMP ROD 5/16" PUMP ROD LOCATION INNER CHOKE ROD CAM ADJ. 20F VAC. BK. FRONT 25F VAC. BK. REAR NOT APPLICABLE UNLOADER 38F

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.