A mass air-flow sensor continually measures the mass of air entering the engine. This information is then supplied to the powertrain control module, ensuring that the precise amount of fuel is delivered to each cylinder. This precision fuel delivery improves driveability and reduces exhaust emissions. The Northstar engine provides outstanding durability and reliability. The engine does not require its first scheduled tune-up until 100,000 miles, except for routine fluid and filter maintenance.
Maintenance needs vary with different uses and driving conditions.
See the Owner's Manual for more information. If for any reason there is a significant loss of coolant that causes the engine to overheat, the Northstar automatically converts to this limp-home mode, alternately delivering fuel to only four of the eight cylinders. The remaining four cylinders do not fire, but continue to pump air. This air, which is pumped through the cylinder, cools the engine and gives the driver an opportunity to reach a safe location. The PCM measures key vehicle factors to create a seamless interface between the engine and transmission.