Service Information

An engine knocking noise may be noted in some vehicles when the engine is started after an overnight cold soak, especially in cold weather. If a noise is present, it may be most noticeable during the first several minutes after starting the engine, then gradually diminish as the engine nears operating temperature. The knock is loudest under light load (1/8 throttle) at 1200-1800 RPM. It is audible in the passenger cabin and outside the vehicle.