Chevrolet Cobalt Service & Repair Manual: 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. |
|
Removal
1.
Remove air inlet duct and resonator.
2.
Disconnect IAC, TPS and MAP sensor.
3.
Disconnect EVAP and PCV ...
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
...
Cylinder Head R&R
Engine Assembly-Short Block R&R