LIGHT HAMMER/RATTLE NOISE (REPL.FUEL FEED HOSE ASSY.)

Subject: LIGHT HAMMER/RATTLE NOISE (REPLACE FUEL FEED HOSE ASSEMBLY)

Models 1989-92 FIREBIRD MODELS WITH 5.OL Affected: OR 5.7L V-8 ENGINE (RPO'S LB9,L98)

CONDITION:

--------- Some 1989-92 Firebird models with 5.OL V-8 engines (RPO LB9) or 5.7L V-8 engines (RPO L98) may exhibit a light hammering/rattle type noise audible in the vehicle passenger compartment.

CAUSE:

----- Pressure pulsations in the fuel system, generated by fuel injector operation, causing hydraulic hammering in chassis fuel pipes.

CORRECTION:

---------- Replace existing underhood fuel feed hose with new hose and damper assembly, P/N 10238701, following applicable Service Manual procedures, Section 6C, Engine Fuel and attached illustration.

PART AVAILABILITY:

Parts are currently available from GMSPO.

WARRANTY INFORMATION:

Labor Operation: L0220

Use applicable Labor Times.

KEY

1. FUEL FEED HOSE AND DAMPER ASSEMBLY

2. CONVOLUTED CONDUIT 1 O" (254mm) LONG

3. CONVOLUTED CONDUIT 7 3/4" (197 mm) LONG

NOTE: ---- REMOVE AND CUT CONVOLUTED CONDUIT FROM OLD PART INTO TWO PIECES, ONE 10" (254 mm) LONG AND THE OTHER 7 3/4" (197mm) LONG. INSTALL CONDUIT ONTO NEW PART AS SHOWN.

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.