Engine - Hard Start, High Idle, and Idle Fluctuation

Group Ref.: Engine Fuel & Emission
Bulletin No.: 476503
Date: February, 1994

SUBJECT:
HARD STARTING DURING A HOT RESTART, INCREASE IN IDLE SPEEDS, AND IDLE FLUCTUATION (REPLACE MEM-CAL)

MODELS:
1990-91 CHEVROLET CORVETTE WITH 5.7L ENGINE (VIN J - RPO LT5) AND MANUAL 6-SPEED TRANSMISSION (ML9)

CONDITION:
Some owners of 1990 Corvettes may comment on idle fluctuation, increase in idle speed after a hot restart, and an increase in engine speed during a vehicle coast to stop with clutch depressed.

Some owners of 1991 Corvettes may comment on a hard starting condition during a hot restart.

CORRECTION:
The calibrations have been refined to address these concerns. Replace the MEM-CAL with the desired unit from the charts.





PART INFORMATION:

Parts are currently available from GMSPO.

WARRANTY INFORMATION:

Labor Operation: T0500

Labor Time: 0.5 hour