Still having misfire on cylinder #5 - BMW M5 Forum and M6 Forums
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post #1 of 4 Old 4th June 2016, 08:20 PM Thread Starter
andrei_g17
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Still having misfire on cylinder #5

Hi guys!

Decided to take the beast out for a spin a few days ago, and noticed that the engine was running a little rough but no codes came up (Max speed was around 50mph). I took it out again and was driving on the freeway (Max speed was 65-70) and then I received "Service Engine, Reduce Power" Code. I plugged in a scanner and got a P305 Cylinder 5 misfire.

I replaced all 10 plugs about 3k miles ago, plus 2 new coil packs (including #5). I swapped coil packs was still getting a misfire on #5. I swapped the Ionic Modules, still the same misfire. What else is left for me to check? I take the car out every 2 weeks, currently sitting with 95k miles. I'd appreciate any help thank you!
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post #2 of 4 Old 4th June 2016, 09:59 PM
alexbigojin
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post #3 of 4 Old 22nd June 2016, 03:30 AM
Pickman
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Clean or replace the MAFS. I had same issue after a few runs at HPDE days at Mid Ohio. Hot days and hard driving. I changed plugs, coils and injectors. did it again last week. Always reads misfire in #5. M5 boards suggest looking into your MAFS.
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post #4 of 4 Old 7th July 2016, 05:53 AM
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