What is Toyota D4-S?

Engines equipped with D4-S combine direct and port type fuel injection that achieve better fuel efficiency, increased engine output and reduced emissions. The Toyota D4-S Injection system has many benefits that contribute to a greener and cleaner environment.

Does Toyota use port injection?

Toyota uses its blended approach of port and direct fuel injection to give the best possible performance, emissions and economy. It is difficult to say when the port, direct or both injectors are active because it depends on many variables like throttle position, load, engine speed and even engine temperature.

Does Toyota use direct injection engines?

Toyota introduced this technology, which it calls D-4S injection, on a V-6 more than a decade ago and now uses port and direct injection on its 2.0-liter flat-four (which is built by Subaru), 3.5-liter V-6, and 5.0-liter V-8.

What is D4 direct injection?

In the D4 engine, fuel is injected under very high pressure into the combustion chamber itself (direct injection). During the combustion process, air is compressed and at a very precise moment fuel is injected directly into the combustion chamber.

What is Toyota D4 engine?

The D4 engine uses an engine computer to regulate the injection of petrol under high pressure (increased fuel atomisation / charge pressure) through a common rail fuel line directly into the combustion chamber of each cylinder. This is the technology in the Voxy, RAV4 and other Toyota vehicles with the 1AZ-FSE engines.

How does a D4 pump works?

A D4 pump has a shaft which has a spring on it. That shaft is the one that sits on the camshaft. When the engine is running that shaft is pushed up and down there by giving fuel more pressure. A D4 pump has oil galleries to allow oil to flow in and out of it as the engine will be running.

Why is port injection better than direct-injection?

Both systems use electronic fuel injectors to spray fuel into the engine, but the difference is where they spray the fuel. With port injection systems, fuel is sprayed into the intake ports. With direct-injection technology, the main benefit is better fuel economy for most applications and a bit more power.

What is the most common disadvantage of direct-injection?

The biggest drawback of direct fuel injection is DI can lead to clogged fuel systems and engine carbon fill up.

What is the most common disadvantage of direct injection?

Why do direct injection engines tick?

A direct injection fuel system produces a rapid clicking and ticking sound that can be heard from the engine compartment. The clicking sound is the fuel injectors pulsing on and off under high fuel pressure. The sound is a normal characteristic of a direct injection fuel high pressure system.

Are D4 engines good?

Evolution of car engine technology has been driven by the pursuit for better fuel economy, engine power and less environmentally harmful emissions. The D4 fuel delivery timing is more precise, as a result the engine runs leaner (uses less fuel), reduces harmful emissions while producing a higher power output.

What cars have direct and port injection?

Examples include:

  • Redesigned Ford 3.5L EcoBoost and V6 engines.
  • Lexus 2GR-FSE engines.
  • Audi’s VW Group 3.0-liter V-6 and 5.2-liter V-10 engines.
  • Toyota’s 2.0-liter in-line four-cylinder engines built by Subaru, and D4-S 3.5-liter V6 and 5.0-liter V-8 engines.