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BMW 3-Series (E90 E92) Forum
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Strange misfires
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02-26-2019, 03:23 PM | #1 |
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Strange misfires
Hi guys!
I have a problem with my e91 335xi N54. When I start the engine in the morning with the cold car, it starts perfectly and hard but when the idle speed goes down to 600 rpm, the engine starts to shake and make noises, it smells a lot of gasoline and moves the needle of the revolutions dances a little. when the idle goes down to 700 or so, the engine sneaks out and stays running with four cylinders and sometimes with 3. Cylinders 1 and 2 always fail and sometimes 3 also. I took the injector 1 and 2 and the coils and changed them to the 5 and the 6 to see if the fault moved from site and find out what it was, but whatever the fault always jumps in the cylinders 1 and 2 and sometimes the 3 too. I think that if it were the O2 sensor, the 3 cylinders would always fail and not only sometimes. the spark plugs are less than 10000km, the VANOS valves are new. I do not understand why it always fails in the same cylinders. Do you have any idea what it could be? the faults are these: -29cd misfire cylinder 1 -29ce misfire cylinder 2 -29cc multiple cylinder misfire. I would appreciate very much if you would give me some guidance |
02-27-2019, 12:22 PM | #5 | |
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Drives: 2009 335i E90
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2008 E61 535xi Sport Wagon / 100k Miles / Deep Sea Blue Metallic / Natural Brown Interior / MHD Stage 1 91 CA-Octane Tune.
SOLD - 2009 E90 335i M-Sport Sedan / 143k Miles / Alpine White Exterior / Chestnut Brown Interior / Mishimoto FMIC / xHP Stage 2. |
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02-28-2019, 12:22 PM | #7 | ||
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03-20-2019, 12:57 PM | #10 | |
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Datalog your car if you want help on the internet, otherwise we are just guessing, it could be several things. Seeing that its isolated to one bank, fuel injectors, o2 sensor, coils, etc all make sense |
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03-20-2019, 05:15 PM | #11 |
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