Most knocks come from the ignition or the injector nailing. Fuel injectors can also cause a knocking noise, especially in older diesel vehicles.
Not all knocks are harmful, so it is important to determine the cause quickly so that if there is a serious issue the vehicle owner can attend to it. Many new vehicles have mechanisms to boost pressure, adjust timing and detect knocking in the engine. One example is the Automatic Performance Control feature that is present in the turbocharged Saab H engines. This works to decrease boost pressure so that the engine no longer has a reason to knock.Learn More
Stalling and loss of power are known flaws associated with Ford EcoBoost engines that have led to numerous complaints from consumers and at least one lawsuit, as of 2014. Most common in F-150 pickups built from 2011 to 2013, the turbocharged engines are also found in other Ford cars and SUVs as well as some Lincolns.Full Answer >
Injecting nitrous oxide into an engine increases the amount of oxygen in the combustion chamber, allowing more fuel to be burned to produce more power. Nitrous oxide also cools the intake air, increasing its density and allowing a higher mass of oxygen to fill the engine's cylinders.Full Answer >
A camshaft closes and opens the intake and exhaust valves of a car engine as the piston pumps up and down. The shape of the camshaft determines engine performance while a car goes at different speeds. With an engine running at high revolutions per second, the camshaft's performance degrades.Full Answer >
VTEC works by utilizing two different optimized cam profiles in order to improve lower RPM performance as well as upper RPM range performance. One cam is used to be fuel efficient and provide stable low-RPM performance, while the other cam is designed to provide additional power at high-RPM output.Full Answer >