Idle speed is controlled by the ECM/PCM. No adjustment is required. |
Curb Idle Speed
Curb idle speed is controlled by the ECM/PCM. No adjustment is required. |
Fast Idle Speed
Fast idle speed is controlled by the ECM/PCM. No adjustment is required. |
Mixture
Fuel mixture is controlled by the ECM/PCM and is not adjustable. |
Chevrolet Cobalt Service & Repair Manual. Compression Pressure
When inspecting cylinder compression,
the engine should be at room temperature, the throttle should be open, the
spark plugs removed and the battery at full charge. The lowest reading cylinder
should not be less than 70% of the highest and no cylinder reading should
be less th ...