Gasoline Direct Injection

October 21, 2020

Question:
My new car has a “GDI” engine. What does that mean to me and other Slinger vehicles with this new type of engine?



Joe’s Slinger Service Answer:
GDI stands for Gasoline Direct Injection. It’s a type of fuel injection system that is becoming very popular on modern engines.


Let’s talk about the two most common forms of fuel injection. Port Fuel Injection has been common in Slinger vehicles for the last several decades. With this type, there is a small port just outside the cylinder on the engine.

  • The fuel injector squirts a bit of gas into this area just before the intake valve opens
  • When the valve opens, air enters the port and mixes with the gas, then flows past the valve and into the engine
  • The gas and air mixture is compressed by the piston


The spark plug fires, igniting the gas which pushes against the piston, thus powering the engine

  • With Gasoline Direct Injection the process is a bit different.
  • First, there is no port outside the cylinder
  • When the intake valve opens, air is drawn into the cylinder
  • The air is compressed by the piston
  • At the correct time, the engine management computer signals the fuel injector to spray gasoline directly into the cylinder (hence, Gas Direct Injection)
  • The pressurized gas and air are ignited by the spark plug, powering the engine


So why move to GDI? Well, by injecting the gas directly into the engine, the management computer is able to time the injection event more precisely. Also the gas sprayed directly into the engine cools the compressed air enough to allow for better combustion. This adds up to more power and better for a given engine size.


Now these two types of fuel delivery systems call for different kinds of fuel injectors. Port fuel injectors squirt their fuel at 40 to 65 pounds per square inch – that’s like the pressure in a bicycle tire.


GDI injectors operate at over 2,000 pounds per square inch. Of course it’s always important to keep your fuel injectors clean – but it’s even more important for GDI injectors. When they become contaminated, the performance and fuel economy diminish.


Speaking of fuel system cleaning, different cleaners and cleaning processes are required for GDI engines. Intake valves get a fair amount of carbon build-up over time. With port injection, some gasoline flows over the valve when it opens to let in the gas and air. This has a cleaning effect which doesn’t occur with GDI. So pouring a bottle of fuel system cleaner in your gas tank will not reach the backside of those intake valves. A professional fuel system cleaning process at Joe’s Slinger Service in Slinger will take care of that concern for Slinger drivers.


So GDI will continue to be more prevalent in WI on everything from compact cars to pick-up trucks. Ask your Joe’s Slinger Service service advisor if your vehicle could benefit from a fuel system cleaning.

February 11, 2026
Most Slinger drivers are aware that manufacturers have service intervals for your car . The engineers that design our vehicles have tested the various systems and components to meet durability and safety standards. Some of these standards are self-imposed and others, like those for emissions components, are government mandated. The maintenance schedules are designed to achieve the standards. Think of the benefits of following recommended intervals as falling into three general categories: Protection, Efficiency and Safety.  Protection . Let’s start with motor oil. First of all, the engineers recommend a particular weight and type of motor oil. All of their oil change recommendations assume using the proper motor oil. Motor oil contains detergents and other additives that clean the engine and provide corrosion resistance. Over time, the additives are depleted. The oil also becomes contaminated by water, dirt and combustion gases. Extending your interval beyond the recommendation means that your engine will be operating without the full protection of fresh motor oil. It also means that sludge can form in contaminated oil and clog up passages in the engine, starving parts from needed lubrication. Efficiency . Some Slinger services are designed to keep automotive systems operating efficiently. For example, the fuel system gets clogged up with gum and varnish from the fuel. Fuel doesn’t flow efficiently which reduces fuel economy. A fuel system cleaning restores the fuel system’s efficiency and increases your gas mileage. Safety . Your brakes are obviously one of the most important safety systems on your vehicle. The has scheduled brake pad replacement as well as power brake fluid drain and replacement intervals. Because brakes are so important, a brake inspection is also on the schedule to head off problems before they result in an accident. Check your owner’s manual for recommended service schedules or talk with your friendly and knowledgeable Joe’s Slinger Service . You may be surprised to learn that various inspections may be on your list of factory recommendations. These inspections are usually at major intervals like 24,000 miles or 40,000 kilometers. They’re designed to uncover important parts that may be close to failing. Your owner’s manual can tell you when to change your oil, but it can’t tell you that you have a radiator hose that’s bulging and about to burst. For that you need a technician. These scheduled inspections are in addition to the multi-point inspections done with a full-service oil change at Joe’s Slinger Service.
Comparison of Budget (EverStart) and ACDelco car batteries, highlighting features. Blue and black background. | Joe's Slinger Service
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Mechanic using a tablet while examining a blue SUV with the hood open in a garage. | Joe's Slinger Service
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