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XBimmers | BMW X3 Forum BMW X3 and X4 Forums | F25 (2011 - 2017) | F26 (2014 - Current) Second Generation BMW X3 (F25) General Forum N55 engine noise

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      07-11-2019, 09:09 PM   #1
luisavila
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N55 engine noise

Hello good night, if someone has any ideas that may have happened.(I attach videos)

I got that noise after about 50 km of having changed a spark plug, all that noise to disappear after 150 km(1.5 hours) of travel. It's very strange because it's gone, there's no more noise.

When the engine was noisy, it issued the fault codes on several cylinders (3-4-6)

I deleted codes and they have not returned. There are no strange noises either.-






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      07-12-2019, 07:47 PM   #2
najnad
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Strange noise for sure. Now that the noise is gone, have you noticed if it is low on power or significant change in mpg? Did you just change one spark plug or all of them? If only one, why? And are you sure you replaced it with the same plug as the others and the proper gap? The engine's computer will adjust to some sub-optimal conditions after a while and wont throw new codes, even though its not working at its best. I think the easy answer is that either something is wrong with the spark plug(s) you replaced and/or something didn't get put back together properly.
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