Corvette V8-350 5.7L DOHC VIN J MFI (1990)
PROM - Programmable Read Only Memory: Customer Interest
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