EXPERTEC TSB (316523)

WARNING: This page is about the Corvette ZR-1, which is a different variant/trim than selected.

Publication date: 1994-01-18
Reference number: 316523

EXPERTEC TSB

TECHNICAL SERVICE BULLETIN

Reference Number(s): 316523, Date of Issue: 01/18/94

SMU - SEC. 6E3 - DRIVEABILITY - AND EMISSIONS CHART C-2B

Model(s): 1990-93 Chevrolet ZR1 Corvette with 5.7L Engine (VIN J- RPO LT5)

Bulletin No.: Chevrolet 316523

Date: 01/18/1994

BULLETIN ILLUSTRATION LIST

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SERVICE INFORMATION

This bulletin revises Service Manual (ST364-94-2) Section 6E3-C2 Driveability and Emissions. CHART C-2B SECONDARY INJECTOR TEST in this bulletin replaces and supersedes CHART C-2B SECONDARY INJECTOR TEST used in the 1990-93 Corvette Service Manuals.

The diagnostic strategy has been changed to diagnose one or more secondary injectors operating when not in full power mode. Symptoms of this condition may include any of the following:

Increased oil consumption
Exhaust smoke; blue or white
Rough or erratic idle
Misses and runs rough at all speeds except in full Power Mode at or near WOT
Poor fuel economy
Excessive exhaust emissions or odors
DTC 45 or 65 set
Long Term Fuel Trim values shifted low

Use the revised CHART C-2B SECONDARY INJECTOR TEST provided in place of CHART C-2B SECONDARY INJECTOR TEST in the 1990-93 Corvette Service Manual.