Fuel Line - Knock/Rattle After a Cold Start

91olds03

NUMBER: 90-T-197

CORP.REF.NO: 006506

DATE: March 1991

SECTION: 6E3


SUBJECT: FUEL LINE KNOCK/RATTLE NEW FUEL PRESSURE REGULATOR


MODELS/YEARS: 1989-90 CUTLASS CALAIS AND CUTLASS CIERA WITH
3300 (VIN N) ENGINE


Some 1989-90 Cutlass Ciera and Cutlass Calais models equipped with the 3300 (VIN N) engine may exhibit a light knock/rattle type noise, audible after a cold start at ambient temperatures below 400 Fahrenheit.

The noise may be audible either in or outside of the vehicle from start-up until the engine is up to normal operating temperatures.

This condition is caused by fuel system pulsations generated by fuel injector operation causing a hydraulic hammering in the chassis fuel pipes.

Vehicles exhibiting this condition may be repaired by installing a new design fuel pressure regulator, Part Number 17112611. The new Fuel Pressure Regulator has a reduced seat orifice and the orifice chamfer has been removed.

IMPORTANT: THE NEW FUEL PRESSURE REGULATOR, PART NUMBER 17112611 WILL ALSO BE THE NEW SERVICE REPLACEMENT REGULATOR FOR THE 1989-90 3300 (VIN N), ENGINE REPLACING PART NUMBER 17112117.

Parts are currently available from GMSPO.