Chevrolet Cobalt Service & Repair Manual: Emission Control System Inspection

Chevrolet Cobalt Service & Repair Manual / Engine Service / Emission Control System Inspection

Caution: Do not remove any component of the engine emission control system. Operating the engine without the engine emission control system intact will reduce fuel economy and engine ventilation. This will weaken engine performance and shorten engine life.
The vehicle emission control information (VECI) decal shows components of the emission control system, the correct vacuum hose routing and the color stripe of the vacuum hoses.
A visual inspection must always be performed to confirm the presence of aftermarket components, potential collision damage, or areas of concern.
1. Visually inspect PCV and EGR system components for damage or wear.
2. Visually inspect O2 sensors and exhaust for obvious signs of physical or electrical damage.
3. Connect a suitably programmed scan tool to vehicle DLC. Ensure no DTCs are present.
4. Start engine, listen for any signs of emission control system leakage.
    Cylinder Head R&R
    Removal 1. Remove air inlet duct and resonator. 2. Disconnect IAC, TPS and MAP sensor. 3. Disconnect EVAP and PCV ...

    Engine Assembly-Short Block R&R
    Some manufacturer supplied short block assemblies do not come equipped with crankshaft and dampener. In-block cam short block assemblies may not include camshaft and timing gear. If ...

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    Chevrolet Cobalt Owners Manual

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