If you think a fuel injector is stuck open, pull up live engine data on your scan tool, and monitor the Fuel Rail Pressure data PID, it has to have one, this being a GDI system. If you can graph that data PID it would be best, then shut the vehicle off but turn the key back on, engine off so you can still see the live data and watch for the Fuel Rail pressure to drop off fast. That's a sign an injector is staying open mechanically. Now if the injector driver in the PCM is burned, and the injector control is constantly grounded, the injector will stay on constantly but only when the engine is running.
Here is the GDI injector operations diagram, you'll notice it states "Also the feed for 2 injectors comes from the same driver set" So power for the high side powers up 2 injectors, and most GDI injectors are Peak and Hold type, meaning they open the injector with a high voltage, and then pulse them with a lower voltage to keep them open. But you should be able to see the Fuel Rail data PID drop off quickly if one is staying open, check that first. Since you can't tap into these fuel rails due to the very high pressure, watching the data PID should help you figure out what's going on, a ton of white smoke sounds like one is staying open. The resistance spec for each injector is 1.5 Ohms. I'm looking for a fuel pressure spec, but it will be high, usually 500 to 2000psi for a GDI rail.
Are there any other specs you want me to look for?
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Wednesday, May 15th, 2024 AT 11:34 AM