Direct Injection Issues [2019 5.0]

[usefvlidiot]

Long story short, I'm on a strict E85 tune (no cats) that i run the car with almost all the time and i've been battling this GDI Injector failure (leaking fuel into the affected cylinder) issue for about a year now.

Similar to @RoyalCrimsonGT's thread, my #2 GDI injector went out, followed by #4 GDI injector. Decided to replace the rest of them. Ran fine for a couple of months until all of them decided to go out again (one by one).

Decided to replace the High Pressure Fuel Rail Sensor, didn't work. Replacing the GDI injectors fixes it but only temporarily for me, until another random one decides to leak fuel into the cylinder. So i switched to my Flex tune and decided to run pump 91 and it seems to allow the car to run better. Seems that the car readjusts fuel trims and all of a sudden the car is no longer leaking fuel or misfiring. Decided to reset the KAM and all of a sudden it starts to dump fuel In one GDI injector again. But if i allow the car to relearn the Short term fuel trims on pump 91 it seems to be alleviating the issue.

But why on earth it even doing this in the first place? At this point this seems to be either a PCM or a GDI pump issue since there is a Fuel Volume control sensor in it. Any ideas?

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[SilverUri]

Hi, have ever figure it out what was wrong?

 

[NGOT8R]

I have a friend with a 2019 twin turbo Bullitt that he’ll be bringing to life very soon. He recently told me that he was going to delete his Di injectors using this kit in the link below. I don’t know much about it, but I will soon be doing a complete fuel system upgrade on my 2019 Bullitt. I may or may not go this route as well, depending on how his turns out. My car has been on E85 99% of the time over the last 4 years. I did have a couple of fuel system related issues (fuel pump failure and a ruptured factory fuel line).

https://budgetbillet.com/products/18-coyote-mustang-f150-di-delete-kit

I know you said that you’ve replaced a few of yours, only to have others fail. I was wondering if you’ve pulled all of the DI injectors and cleaned the rails thoroughly?

 

[NGOT8R]

Hi, have ever figure in out what was wrong?

Good question, I would like to know as well. Hopefully he comes back and chimes in. It looks like he was last seen on here in Aug. 2024.

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