Here Are The Pros And Cons Of Direct Injection

Illustration for article titled Here Are The Pros And Cons Of Direct Injection
Screenshot: Bosch

Direct injection motors are the new cool kids on the block and it’s becoming more an more common on newer cars. What is direct injection? Should I be afraid of it?


This video from Savagegeese explains what direct injection is and what can go wrong with it. In addition to the pros and cons, preventative maintenance is also explained. The host also touches on older port-injection motors as well as motors that utilize both methods of fuel-injection. Using diagrams from Bosch, the host explains how all this works.

In an effort to comply with new environmental regulations, direct injection is now the norm on many new models. This type of injection has the injector nozzle spraying directly into the combustion chamber, allowing much less fuel to be wasted and lower emissions in general.

Port-injection, the one we’re all used to, has the injector nozzles spraying into the combustion chamber over and through the valve openings. In general, this is much less complicated way of delivering fuel but allows for much more fuel to be wasted and higher emissions.

The host explains a few problems that car owners can experience with direct injection that includes dirtier valves and degraded performance (especially on turbocharged engines). In addition, the host also demonstrates a few possible ways to remedy the downsides of direct injection. Although we may be better off just driving an older car if we’re worried about maintaining a direct injection engine.

Lance Tedford spends his energies working on his 1985 Chrysler LeBaron. He is extremely tall and can never die.


I wouldn’t mind seeing a feature, or even a mod, that adds a small injector on the intake manifold that pulls from a reservoir you fill with fuel system cleaner. Right now I have a couple of catch cans under the hood, but I’d rather top off a small tank every time I do an oil change than remove those cans to drain them.