SPEED LOSS ON HILLS CRUISE REVISE HOSE ROUTING S/T TRUCK. GMC Truck S15 Pickup - 2WD 1983

For 1990-2009 cars

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

SOME 1983 S/T TRUCKS WITH LR2 2.8L V-6 AND LQ2 2.0L L-4 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 SHOWN (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.