Fuel Injector Failures on Volkswagen 2.0T TSI
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The TSI engine (like many modern engines) uses direct injection, which places the fuel injector in the cylinder or combustion chamber. Since this is where the spark and ignition of fuel that drives the engine, the injectors are subject to a pretty harsh environment. In the picture below we are showing the previous port injection vs direct injection. While it might sound like it would not make sense to place the injector inside the cylinder due to conditions, it has plenty of positives. The benefits are fuel efficiency and control, which not only leads to better fuel mileage, but can give the ability to make more power due to the precision of direct injection.
How do I know if I have bad injectors on my VW or Audi 2.0T TSI?
When an injector goes bad on a VW or Audi 2.0T TSI engine you can expect misfires. This would result in fault codes like P0300, P0301(for cylinder 1), P0302(for cylinder 2) , P0303(for cylinder 3), P0304(for cylinder 4). You would likely only get misfires on 1 or 2 cylinders, as its unlikely all 4 injectors will fail at the same time. Generally when these fuel injectors fail they will get stuck open (consistently or sporadically) causing misfire issues. Before assuming you have a fuel injector issue you should confirm you DO NOT have issues with the following problems, Ignition Coils, Spark Plugs (changes every 40-60K) or Carbon build up. All of the listed failures are more probable to cause misfires. Once you have verified that not of those items are issues you should look into injectors. To replace the fuel injectors on the TSI engine you will need to remove the intake manifold which we have a video on How to Remove the 2.0T TSI Intake Manifold(Shown below).