HIGHWAY CHUGGLE AND SPARK KNOCK CONCERNS

1987 SUNBIRD MODEL WITH 2.0L OHC L-4 (VIN CODE K) ENGINE IN ALL TRANSMISSION APPLICATIONS

Customers comments that identify a highway low-speed chuggle or spark knock concern may be repaired with the following changes.

PART NUMBER

- Intake Manifold Drop-Tube Kit 10106050 - EGR Valve:

Automatic Transmission 17112004 Manual Transmission 17112005 - PROM Package:

NEW PROM I. D. NEW Transmission PART NUMBER (SCAN TOOL) BROADCAST CODE ------------- ----------- ----------- --------------- Automatic 16129055 9082 ANXF Manual 16129053 9062 ANXC

Parts are expected to be available on September 19, 1988. Until then normal part orders will not be accepted by GMSPO. Only verifiable emergency VIP orders will be accepted. GMSPO will make every effort to obtain parts. All parts will be placed on 400 control to waive VIP surcharges. However, the part will be shipped premium transportation at dealer's expense. All other order types will be canceled as incorrectly ordered while the 400 control is in place.

If driveability conditions still continue after the above changes, refer to Service Manual Section 6E2-B for further directions.

Warranty Information

Labor Operation: T1384 Labor Time : .9 Hours

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.