HIGHWAY CHUGGLE AND SPARK KNOCK CONCERNS

1987 FIRENZA WITH 2.0L OHC L4 ENGINE MODELS/YEARS: IN ALL TRANSAXLE APPLICATIONS (INSTALLATION OF NEW PARTS)

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

- Intake Manifold Drop-Tube Kit Part Number 10106050

- EGR Valve:

Automatic Transaxle Part Number 17112004 Manual Transaxle Part Number 17112005

- PROM Package:

New PROM I.D. New Transaxle Part Number (Scan Tool) Broadcast Code ---------- ----------- ----------- -------------- Automatic 16129056 9092 ANXH Manual 16129057 9072 ANXD

Parts are currently available through GMSPO.

If driveability conditions still continue after the above changes, refer to service manual section 6E2-B for further directions.

WARRANTY INFORMATION

Labor Operation Number: T1384 Labor Time: .9 hrs. Trouble Code: 92

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.