Why is the exhaust pipe of the Haval H9 emitting black smoke?
2 Answers
The black smoke from the exhaust pipe of the Haval H9 is mainly caused by an overly rich fuel-air mixture and incomplete combustion, especially during cold idle when the engine temperature hasn't risen yet. At this time, the fuel injectors deliver a larger amount of fuel, resulting in an overly rich mixture and incomplete combustion. The Haval H9 is Haval's first high-end off-road SUV, with body dimensions of 4856mm in length, 1926mm in width, and 1900mm in height, and a wheelbase of 2800mm. In terms of configuration, the Haval H9 is equipped with full-speed ACC adaptive cruise control, collision warning with emergency braking, lane departure warning with lane change assist, reverse side warning, L2-level autonomous driving, and CCO low-speed off-road cruise.
I've been driving a Haval H9 for several years, and it's actually quite common to encounter black smoke from the exhaust pipe, mainly due to incomplete fuel combustion. The reasons could be a clogged air filter not allowing enough air in, or fuel injectors leaking too much fuel into the cylinders, leading to incomplete combustion and billowing black smoke. Another possibility is a faulty fuel pressure regulator causing excessive fuel pumping—I once replaced it and the problem was solved. If you're a DIYer, you can check the air filter; take it apart and if it's full of dust, replace it—it's simple and easy. If that doesn't work, you'll need to visit a 4S shop to check the ignition system, as faulty spark plugs or ignition coils are also common issues. Black smoke not only increases fuel consumption but also leads to more engine carbon buildup, shortening its lifespan. Regular maintenance of the air filter can prevent this, saving both trouble and money. By the way, this issue is more likely to occur in diesel vehicles, so pay extra attention to the dashboard warning lights during long trips.
