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Cylinder 123 Misfire
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02-02-2023, 05:04 PM | #1 |
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Cylinder 123 Misfire
Anybody have an idea why my N54 suddenly developed a misfire on cylinder is 1, 2 and three. Car has been running great for years and all of a sudden this happened while I was driving. I changed the plugs and the coils but no difference. it had a high-pressure fuel pump replaced once, and a low pressure fuel pump replaced once. Car has 112 K & JB4. I put a stp fuel cleaner in tank 25 miles before this happened. Maybe Oxy sensors on that bank?
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02-02-2023, 08:09 PM | #2 |
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Drives: bmw 328i 2011
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Check for oil leaks that might’ve fell in spark plug wells
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02-04-2023, 11:35 AM | #3 |
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if there was oil in your spark plug well when you were doing the spark plug replacements then it is likely your valve cover gasket is shot and needs replacement. It's a cheap fix but a pain in the ass to do.
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02-13-2023, 09:22 PM | #4 |
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It really quite difficult to diagnose without having some reading from a computer hooked up to the car.
The STP in the fuel tank might give us a clue though. It likely loosened up some trash in the tank and clogged 1 of your injectors. As a general rule of thumb I would say to never put any of those "treatment" in your gas tank. I would use only good quality fuels like shell or chevron and forget about those additives trash that just ruin pumps and everything else. |
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02-16-2023, 09:06 PM | #5 | |
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Quote:
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06-11-2023, 09:58 PM | #6 |
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06-12-2023, 02:35 AM | #7 |
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upstream bank 1 o2 sensor. Same thing happened to my car and replacing it fixed my issues. Check your fuel trims to double check, if they are all over the place its definitely the o2
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2007 E92 328i 6MT | KW V3 | 3SI | SSR Type-C 18x9.5/10.5 | AA Headers
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