There are also less likely possibilities. If you're in Ontario, a leak should get caught during mandatory emissions testing. "It would involve getting the vehicle up in a lift, and odd contortions, and sticking lights in strange places," he said. It's not the type of thing that a home mechanic can easily do, Brown-Harrison says. The leak could be anywhere between the engine and the tailpipe, although exhaust under the engine likely means that the leak is between the engine and the catalytic converter. Since exhaust contains a lot of water, systems rust from the inside out. This is more common in vehicles more than six years old, especially in Eastern Canada, where a lot of salt is used on the roads. To answer your other question, if the exhaust is coming in from under the hood - either through the heater or through a hole in the wall between the engine and the passenger compartment - it's typically the result of a leak somewhere in the exhaust system, and that's likely caused by rust. It could be coming in from the tailpipe through other vents built into the vehicle cabin. If it's especially strong when the recirculation mode is on - when the same air is being recycled over and over again - it could mean that exhaust is not coming in from under the hood. If that system hasn't been tampered with, say, by modifying the exhaust system, then the exhaust coming out of your tailpipe is more polluted than it should be. Vehicles built since 1995 have a computer system to control the emissions of the vehicle, Brown-Harrison says. The problem is a poorly operating engine." "If the occupants are experiencing eye irritation then the emissions from the engine are outside accepted levels.
"The vehicle needs to be taken to a service centre as soon as possible and be inspected," says Patrick Brown-Harrison, automotive instructor at SAIT Polytechnic in Calgary.
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