Circuit/System Testing
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect the air intake system for the following:
- Modified, damaged or restricted
- Dirty or deteriorating air filter element
- Crankcase ventilation system for correct operation-refer to Crankcase Ventilation System Inspection/Diagnosis .
- Water intrusion
- Vacuum leak and other un-metered air downstream of the mass air flow (MAF) sensor
- Intake manifold leak
- Inspect the exhaust system for the following:
- Water intrusion
- Exhaust leak
- Damaged, restricted, modified or enhanced exhaust system-Refer to Symptoms - Engine Exhaust .
- Inspect the engine mechanical for items that could alter the air flow into the combustion chamber-Refer to Symptoms - Engine Mechanical .