What Causes Engine Noise After the Territory Shuts Down?
2 Answers
The reasons for engine noise after the Territory shuts down are: 1. Cooling sound of the three-way catalytic converter; 2. Cooling sound of the exhaust pipe; 3. Turbo cooling sound; 4. Abnormal noise caused by uneven engine cooling; 5. Loose screws at the three-way catalytic converter interface; 6. Damaged carbon canister solenoid valve; 7. Poor operation of the starter's pull-in motor. Taking the 2020 Territory as an example, it belongs to a compact SUV with body dimensions of 4580mm in length, 1936mm in width, and 1674mm in height, a wheelbase of 2716mm, a fuel tank capacity of 52 liters, and a curb weight of 1520kg.
I just encountered a similar situation last week. After turning off the engine, there was still a buzzing or clanging sound in the engine bay, which really startled me at the time. This is most likely the exhaust pipe cooling and contracting, especially noticeable after highway driving in summer. When metal expands and contracts due to heat, the welding points can make a 'clicking' sound, which is normal and can last for over ten minutes. If you turn off the engine while the air conditioning is on, the electric fan will continue to cool the system, producing a sound like a small hair dryer. Occasionally, you might also hear a ticking sound similar to a clock, which is the ceramic substrate inside the catalytic converter cooling down. Remember, as long as the sound isn't metal grinding or a hissing noise indicating a leak, there's no need to panic. Just park the car, lock the doors, and go about your business.
