PCM - Above Normal Hydrocarbons During Smog Check

File In Section: 6E - Engine Fuel & Emission

Bulletin No.: 57-65-15

Date: October, 1995

Subject:
Higher Than Normal Hydrocarbons During the Inspection and Maintenance Test and/or Slight Detonation Noise (Install New E-PROM)

Models:
1992-93 Buick Roadmaster
1992-93 Chevrolet Caprice
1992 Oldsmobile Custom Cruiser
with 5.7L Engine (VIN 7 - RPO L05) and 4L60 Automatic Transmission

Condition

Some owners of police and non-police vehicles may experience higher than normal hydrocarbon emissions during the idle portion of the inspection and maintenance test. Also, some police vehicles may exhibit a slight detonation during a light throttle acceleration.

Correction

Parts Information





If all engine mechanical and electrical components are working properly, install the proper E-PROM listed from the table.

Parts are currently available from GMSPO.

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation Labor Time
J6364 Use published labor operation time.