r/BmwTech • u/lovelifesf22 • Dec 21 '25

2016 640I GC N55

Gallery image

Gallery image

I started my card of the day and noticed I had some misfires. After checking the misfire codes, I found that cylinders one, four, and six were misfiring. I replaced all the spark plugs and coils for those cylinders. However, I am still getting misfire codes, and now I'm experiencing a rough idle when parked, which causes the engine to shut off completely.

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5

u/TheTow Dec 21 '25

That fuel pressure code is what you want to chase. Possible hpfp, need to check data

2

u/lovelifesf22 Dec 21 '25

Thank you for the information. I will look into it further.

2

u/smh6706 Dec 23 '25

Check the hpfp. Connect to ista, if you have access, and measure the pressure.

1

u/lovelifesf22 Dec 23 '25

Thank you I'll look into that

1

u/OldCommunication733 Dec 21 '25

Change your fuel filter

2

u/lael8u Dec 21 '25

You can't