If you stumbled upon this post because of a faulty Mitsubishi Galant throttle body, you’ve come to the right place. In my line of work, I’ve discovered that the early 2000s Mitsubishi Galant GDI (4g93) often experienced issues with the throttle body.
A couple of weeks ago, a client came to my shop looking for a replacement throttle body unit for his 2001 Mitsubishi Galant. After carefully diagnosing his car, we discovered his worries were not related to the throttle body but to faulty coils and lead wires.
Your problems might be similar to his, and that’s why it is important to thoroughly inspect your car before investing in a replacement part that could potentially be a waste of your money.
As you’ll soon find out, a faulty Mitsubishi Galant throttle body might give off symptoms similar to faulty lead wires and coils. The symptoms are also quite similar to a faulty fuel pump. It’s due to this reason that you need to properly diagnose your car with a scan tool.
What is a Mitsubishi Galant Throttle Body
In most modern fuel-injected vehicles, the throttle body is a critical component of the air intake system. It controls the amount of air going into the engine, which depends on how far the driver floors the accelerator pedal.
When the driver is pressing the accelerator pedal, the throttle position sensor gets the signal based on where the foot is, from up (at the zero mark) to down (for full acceleration). The throttle position sensor sends this information to the ECU (vehicle’s computer), offering constant updates on the throttle position.
It is important to note that the pedal’s position on this range is how the ECU can relay information to the fuel injection system on the quantity of fuel injected into the combustion chamber.
Signs and Symptoms of a Failing Mitsubishi Galant Throttle Body
When your Mitsubishi Galant throttle body is working perfectly, there is a perfect air-to-fuel ratio, which ultimately helps your car’s smooth performance.
Like any other component in your vehicle, your throttle body is prone to wear after extended use. When this happens, your car will throw the following symptoms to alert the driver that everything might not be correct.
Electrical issues
When you have electrical car problems, it often leads to intermittent or inaccurate information relayed to the car’s computer. Just like any electrical car problem, when you experience connectivity issues, you are likely to have a range of unpredictable signals getting transmitted. When this happens with the Mitsubishi Galant throttle body, inaccurate information is sent to the ECU, resulting in faulty air and fuel mixtures.
Grime and carbon deposits on the inside of the housing
When dirt and grime build up inside the housing, it can affect the air and fuel flow. The result of an uneven surface for the air and fuel flow is an imbalance in the flow. Just like grime and dirt, when there are carbon deposits on the inside of the throttle body housing, the atomization of the air and fuel mixture can be interrupted.
Poor fuel economy
By now, you already know that a faulty throttle body will cause improper fuel and air mixture. This will also have a significant effect on your fuel efficiency. Therefore, if you notice you are using more fuel than normal, your throttle body could be faulty.
Poor performance
Your engine requires the right balance of air and fuel to run effectively. If your engine doesn’t get the right amount of air due to a faulty throttle body, it will struggle to achieve the driver’s input. If you notice your vehicle is using half of its engine power driving down the road, your throttle body could be failing.
Erratic idle
A faulty Mitusbishi Galant throttle body affects the RPM (Revs per minute). Sometimes, it can cause the RPM to be low when idling, forcing the engine to stall. This is usually caused by a lot of grime and dirt on the throttle body flap, forcing little air to flow into the engine, resulting in a low idle RPM. Cleaning the throttle body will typically solve this problem.
Misfire
A misfire occurs when the air-to-fuel ratio is incorrect. It can also result from a weak spark from the spark plug. As explained above, a faulty throttle body leads to a poor air-to-fuel mixture, which is easily noticed by a small bump or pop when revving the engine.
If your early 2000s Mitsubishi Galant GDI presents all the above symptoms, your throttle body could be faulty. But before you rush to replace this unit, properly scan your vehicle for error codes—the result will help you solve the problem more effectively and save money in the long run.
A rule of thumb is to always seek the advice of a professional and experienced mechanic when you encounter such issues. It will ultimately save you a lot of time and money.
