N52 Rough Idle

Duplified · 03-17-2015, 07:42 AM

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!

Meeni · 03-17-2015, 07:45 AM

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.

Duplified · 03-17-2015, 07:49 AM

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.

cpie168 · 03-17-2015, 12:22 PM

Keep us posted!

Efthreeoh · 03-17-2015, 04:13 PM

It's past 100,000 miles, so it needs plugs if they weren't done at 166KM. Bets to scan first and diagnose later.

Duplified · 03-17-2015, 06:51 PM

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!

Duplified · 03-18-2015, 10:15 PM

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?

Efthreeoh · 03-19-2015, 05:14 AM

Quote:

Originally Posted by Duplified

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.

Meeni · 03-19-2015, 04:50 PM

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.

cpie168 · 03-19-2015, 06:44 PM

How many vanos solenoids are in the engine?

03-17-2015, 07:42 AM	#1
Duplified New Member 3 Rep 14 Posts Drives: 2006 325i Join Date: Mar 2015 Location: New Brunswick iTrader: (0)	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, 07:45 AM	#2
Meeni Gateropode 329 Rep 2,848 Posts Drives: BMW 330i 06 Join Date: Apr 2012 Location: TN iTrader: (0)	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, 07:49 AM	#3
Duplified New Member 3 Rep 14 Posts Drives: 2006 325i Join Date: Mar 2015 Location: New Brunswick iTrader: (0)	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, 12:22 PM	#4
cpie168 Major 173 Rep 1,117 Posts Drives: 2010 E90 328i 6MT ZSP BSM Join Date: Mar 2014 Location: K/W and GTA, Ontario, Canada iTrader: (1)	Keep us posted!
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03-17-2015, 04:13 PM	#5
Efthreeoh General 17317 Rep 18,740 Posts Drives: The E90 + Z4 Coupe & Z3 R'ster Join Date: May 2012 Location: Virginia iTrader: (0)	It's past 100,000 miles, so it needs plugs if they weren't done at 166KM. Bets to scan first and diagnose later. __________________ A manual transmission 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. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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03-17-2015, 06:51 PM	#6
Duplified New Member 3 Rep 14 Posts Drives: 2006 325i Join Date: Mar 2015 Location: New Brunswick iTrader: (0)	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, 10:15 PM	#7
Duplified New Member 3 Rep 14 Posts Drives: 2006 325i Join Date: Mar 2015 Location: New Brunswick iTrader: (0)	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, 04:50 PM	#9
Meeni Gateropode 329 Rep 2,848 Posts Drives: BMW 330i 06 Join Date: Apr 2012 Location: TN iTrader: (0)	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, 06:44 PM	#10
cpie168 Major 173 Rep 1,117 Posts Drives: 2010 E90 328i 6MT ZSP BSM Join Date: Mar 2014 Location: K/W and GTA, Ontario, Canada iTrader: (1)	How many vanos solenoids are in the engine?
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