I have a 2013 GMC Terrain 4 cylinder 2.4L engine with about 83,000 miles on it. Currently I need to replace the fuel injector based off my recent diagnostic at the dealership. I opted to do it myself because they want to charge me 1400 for it. I've got everything I need so far except recently I read that injectors for gdi engines need their fuel injectors to coded (reprogrammed or recalibrated) to the ECU when replacing them. However, I can't confirm if this applies to my vehicle specifically add I've have two mechanics tell me they've never done it. If so, at what part of the process does this need to happen and what is the cheapest dependable device to do this with?
It depends on the system really. For GDI BMWs, the injectors need to be coded IF you buy injectors that have a different code compared to the ones you're replacing. This code describes the spray pattern and flow rate of the injector, and the ECU needs to know this in order to spray the right amount of fuel in the chamber. So if you replace an injector with one that has the same code, then you don't need to re-code anything. But if you replace one with a different coded injector, then you will need to re-code it with a special dealer-level scan tool or program to ensure the engine runs correctly.
