Notes & Precautions

When performing tune-up procedures described in this article, the following notes and precautions should be followed:

• This engine is used exclusively on the Camaro and Firebird models. It was introduced in 1985 and used through 1989.
• A cold-start injector is used on all models. It is used to add extra fuel when the engine is cold. It is non-ECM controlled. Don't overlook this during relevant diagnosis.
• A deceleration valve (gulp valve) is used on M/T equipped models. If dealing with a vacuum leak, be aware of its existance.
• When doing computer system diagnosis, ALWAYS start with the Diagnostic Circuit Check. This procedure is found under the COMPUTERIZED ENGINE CONTROL SYSTEM header.
• The Diagnostic Trouble Codes (DTC) Charts, A-charts, B-charts, and C-charts are not contained in this article. They can be found in the appropriate article in the ENGINE PERFORMANCE section. Therefore, if a procedure in this article direct you to one of these charts, proceed to the ENGINE PERFORMANCE section.
• Specifications and/or procedures shown on the Vehicle Emission Control Information label (in the engine compartment) supersedes all data in this article in the event of a conflict. In other words, if the information in this article and the label differ, use the label information.