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      03-17-2015, 08:42 AM   #1
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N52 Rough Idle

Hi Guys,

I just got myself a 2006 325i and it drove great for the first few days. However, we had a big snow storm and it got covered in a drift. I dug it out and when I started it up it had a rough idle. The needle only bounces +-75ish rpms but there is a noticeable vibration that goes away when its driving. I got a CEL and will pick up a code scanner tomorrow but I am wondering if you guys just think its a bad coil or something else? Would a dirty map sensor or ICV cause this? I want to clean them out because the car has 203k km's on it anyways but I was just wondering if you guys have any thoughts. Also are there any other sensors I should clean while im at it?

Thanks a bunch!
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      03-17-2015, 08:45 AM   #2
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Can be all of the above and more. Your first step is getting a code out. Since it has a CEL it will have some good information about what's going on.
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      03-17-2015, 08:49 AM   #3
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Okay sounds good! I will let you guys know the code when I have it. But are there any other sensors that I should be cleaning while im working on the car? Or any other preventative maintenance steps I should take? The previous owner took good care of it and got it serviced regularly but from the looks of it, it needs a good cleaning haha. There's a decent layer of dirt coating the whole engine bay.
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      03-17-2015, 01:22 PM   #4
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Keep us posted!
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      03-17-2015, 05:13 PM   #5
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It's past 100,000 miles, so it needs plugs if they weren't done at 166KM. Bets to scan first and diagnose later.
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I'm sorry, but a manual trans can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it. It doesn't need "modes"; modes are for manumatics that try to behave like a real 3-pedal manual transmission.
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      03-17-2015, 07:51 PM   #6
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The plugs were done at 170ish and I looked at them today and they seemed fine. I also cleaned my maf and looked for oil in my eccentric shaft sensor and everything looked good but I have the same idle. I am hoping I have a misfire code tomorrow because that would make this pretty easy and I wont have to deal with the horror stories a lot of people have. Also the vibrations stop at higher revs so I think its a misfire but ill let you guys know tomorrow! Thanks for all of your help!
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      03-18-2015, 11:15 PM   #7
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Hey guys! So i pulled the code and it was a misfire in cylinder #5. I got a new coil and she runs great again! However, im still just wondering what sensors I should clean? I have read a lot of stuff on the vanos solenoids and it seems like they can get gummed up. Is it worth taking them out and cleaning them?
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      03-19-2015, 06:14 AM   #8
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Quote:
Originally Posted by Duplified View Post
Hey guys! So i pulled the code and it was a misfire in cylinder #5. I got a new coil and she runs great again! However, im still just wondering what sensors I should clean? I have read a lot of stuff on the vanos solenoids and it seems like they can get gummed up. Is it worth taking them out and cleaning them?
I clean and swap mine every 50,000 miles.
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I'm sorry, but a manual trans can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it. It doesn't need "modes"; modes are for manumatics that try to behave like a real 3-pedal manual transmission.
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      03-19-2015, 05:50 PM   #9
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If the car runs fine, just leave it alone If you feel it's hesitating without causing a code, cleaning and swapping the VANOS is a good first set at diagnosing.
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      03-19-2015, 07:44 PM   #10
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How many vanos solenoids are in the engine?
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