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      10-25-2016, 02:07 AM   #1
Brandon818
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N54 rough idle, hesitating to start

I just got a 2012 335is (n54). But the car has a rough idle, and hesitates to start. any idea of what it is? hopefully just spark plugs and coil packs. im scared its the low or high pressure fuel pump. how much do these repairs usually cost?
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      10-25-2016, 06:56 AM   #2
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Get your fault codes read by a good indy. Guessing just throws money at the problem, with no guarantee of a solution...
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      10-27-2016, 04:03 PM   #3
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When was the last time you did plugs? What's your mileage?

Rough idle can easily be plugs, and they're cheap and easy to do yourself.
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      10-27-2016, 10:42 PM   #4
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My is just had the same two symptoms. Rough idle was an injector. Long start was HPFP.

I've got an extended warranty, but the HPFP failed a fuel system test that was run by the BMW tech. I would assume one of the laptop run diagnostic software that you can download can run the same test.
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      10-28-2016, 12:06 PM   #5
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I brought it to a bmw code reader. and he told me all 6 injectors need to be replaced.
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      11-17-2016, 02:49 PM   #6
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injectors, spark plug, fuel system/ clogged fuel filter..
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