What are the solutions for failing emission tests?
2 Answers
Repair at a service center by replacing and adjusting all necessary components before rechecking the emissions. Address the fuel injectors. If the fuel injectors are faulty, the catalytic converter needs to be replaced. Rinse the exhaust pipe with water to temporarily alter the emissions. Clean the air filter and fuel injectors to ensure proper functioning of the components. Delay the ignition timing to significantly reduce the NO (nitric oxide) content in the exhaust.
Last time my car failed the annual emission test, an experienced mechanic taught me the tricks. The main culprit was a faulty catalytic converter—either clogged with carbon deposits or with a broken ceramic core, both causing excessive emissions. Also, a poisoned or failed oxygen sensor blindly commands the fuel injection like a blind man, no wonder black smoke pours out. For older cars burning oil, check the piston rings and valve stem seals; blue smoke from the exhaust is a sure sign of failure. Change the air filter regularly—a dirty one hurts combustion efficiency. Now I only use top-brand 95# fuel; low-quality fuel harms both the car and the environment. Oh, and last winter, the drain hole in the exhaust pipe got clogged with mud, leading to water buildup that corroded the pipe—worthless damage, so remember to check yours.
