POWER STEERING SHUDDER REPLACE INLET HOSE & PIPE ASSY

SUBJECT: POWER STEERING SHUDDER (INLET HOSE AND PIPE ASSEMBLY REPLACEMENT)

VEHICLES AFFECTED: 1988-91 W CAR WITH 2.8L AND 3.1L

Condition:

------------- Some 1988-91 W-cars with 2.8L (RPO LB6) or 3.lL (RPO LHO) V-6 engines assembled prior to VIN breakpoints indicated below, may exhibit a slight power steering shudder condition noted during static or low speed turning maneuvers. This condition may be perceived as a disturbance felt and heard by the vehicle operator through the body structure and steering wheel.

VIN Breakpoints

Chevrolet Oshawa #1 M9143557 Oshawa #2 M1116359 Oldsmobile Doraville MD329431 Pontiac Fairfax MF235638 Buick Oshawa #2 M1829387

Cause:

------ A combination of power steering pump pressure pulses and engine firing frequency generating a disturbance transmitted through the body structure.

Correction:

------------ Replace the existing power steering inlet (pressure) hose and pipe assembly with new assembly noted below by model year, with internal tuning cable and high expansion hose material.

1988- 90 1991 ------------ ------------- P/N 26025653 P/N 26026921

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.