Additional Symptoms Tests: Surges/Chuggles
WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect the mass air flow (MAF) sensor for obstruction, contamination and damage. Refer to Mass Airflow Sensor with Intake Air Temperature Sensor Replacement .
- Verify that each injector harness is connected to the correct injector.
- Inspect for slow responding heated oxygen sensors (HO2S). The HO2S should respond quickly to a change in throttle position. If the HO2S do not respond to different throttle positions, inspect for contamination from fuel, silicon or the incorrect use of RTV sealant. The sensors may have a white powdery coating and result in a high, but false, signal voltage, which gives a rich exhaust indication. The ECM reduces the amount of fuel delivered to the engine, causing a driveability condition.