Torque Shop

Why does a car backfire?

A backfire occurs when unburnt fuel ignites outside the engine's combustion chamber, usually in the exhaust system.

It is rare in modern engines with computer-controlled fuel injection. In a backfire, flames may be visible from the car's tail pipe, accompanied by a loud popping noise.


A version of this article appeared in the print edition of The Straits Times on September 19, 2015, with the headline 'TorqueShop'. Print Edition | Subscribe