SPEED LOSS ON HILLS CRUISE REVISE HOSE ROUTING S/T TRUCK

Some 1983 "S/T" trucks with LR2 2.8L V6 and LQ2 2.0L L4 engines may lose in excess of 4 mph on long grades or hills. This condition is caused by insufficient engine vacuum and can be remedied by implementing the following changes:

LQ2 ENGINE

1. LQ2 engine with A/C and/or 4WD.

a. Remove existing hose and cap tee (W-3). b. Install new hose route as shown (X-2). c. Cut existing hose install tee - attach hoses (Y-1).

2. LQ2 engine without A/C and/or 4WD.

a. Remove existing hose and cap tee (W-3). b. Install new hose - route as showh (X-2). c. Remove existing fitting and install vacuum fitting attach hose (Z-2-4*).

LR2 ENGINE

1. LR2 engine with A/C and/or 4WD.

a. Remove existing hose and cap tee (W-3). b. Install new hose route as shown (X-2). c. Cut existing hose install tee (Y-1).

2. LR2 engine without A/C and/or 4WD.

a. Remove existing hose and cap tee (W-3). b. Install new hose - route as shown (X-2). c. Remove plug in intake and install vacuum fitting - attach hose (Z-2-4*).

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.