The D4 Toyota engine

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Toyota Premio I

The D4 Toyota engine

Friday, 01 2013 08:24 By Motoring

Why has it gotten such a bad reputation?

Of there is now the VVT-i D4, the latest extension of the `Direct Injection’ technology. VVT-i D4 is an upgrade of award-winning Variable Valve with intelligence (VVT-i) But that is a discussion for another


Today, we are prompted to discuss an that has attracted a little bit of on the street; the D4 engine. Is it really as as some car brokers and street mechanics claim? Absolutely

It appears, from our research, although the D4 engine is about two old and has been overtaken by the types we above, it is relatively new and uncommon on the market where Electronic Injection (EFI) rules.

Since the motorcar was invented, the for engineers has been how to make an that delivers the highest and speed at lowest fuel Issues of quality and quantity of have become an issue

The D4 direct injection engine is, in a variant of the ultra-efficient Gasoline Injection (GDI) engine popularised by Mitsubishi in the mid-1990s. The GDI was a variant of the EFI.

In Uganda, the popularised D4-(GDI) vehicle is the Premio. I have met owners of popular car who confess to almost after their mechanic the bonnet and swore they had the mistake of their life by a D4 engine car.

My advice would be to ignore the

In reality, the differences between the EFI and GDI are technical but they revolve attempts to bypass the old technology of mixing fuel and air and burning it in the efficiently and with minimal CO2

An excerpt from an expert says: “In GDI engines, petrol is injected into the cylinder, many of the hitherto restrictions on control, such as the impossibility of fuel after the induction were closed. By achieving combustion control that is of restrictions, the GDI delivers a previously combination of fuel economy and

In conventional engines, fuel and air are outside the cylinder. This waste between the mixing and the cylinder, as well as imperfect timing. But in the Toyota D4 engine, is injected directly into the with precise timing, waste and inefficiency.”

So why are the D4s so unpopular if are that superb?

It all starts maintenance.

I follow a lot of online car In one thread, a driver of a Toyota with a D4 engine complained the engine going off instead of when he did 100kph for some and then either slowing or braking. He suspected it had to do with sensors, or fuel filter. He was because he had to restart every

Toyota Premio I

As anyone who follows these knows, not all offers of advice are to be seriously. But a comment from called Gregory, from in our lovely land, caught my

He wrote (with some of my “Simple; that is just a fuel system caused by fuel. The sensor heads are covered by dirt, carbon, It can easily be rectified by simply the fuel system around the compartment by qualified personnel.”

he offered some tips for all D4 car owners:

Maintenance must be for day to day running:

Blow air cleaner to keep enough aeration

Maintain a standard minimum of fuel in the tank i.e. not run tank all time.

Another useful thread I recommended use of iridium plugs have to be changed in time at below 60,000kms, and use of synthetic oil to be changed after about and keeping an eye on the timing belt.

service and quality fuel make the engine last for Attend to it quickly if there are of over-heating. It’s a powerful engine that is fuel Its problems are with its sensors; sensor, fuel pressure and ignition timing sensor.

of course might not be solutions to D4 engine problem. But at least you now that the D4- (GDI) engine is not as as some people claim it is.

Toyota Premio I
Toyota Premio I
Toyota Premio I

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