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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Odd behavior at start up



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      10-15-2010, 02:43 PM   #1
dcat151
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Odd behavior at start up

My air intake filter needed to be replaced so last week I replaced the paper filter with a K&N drop-in filter. Since the replacement, my car has acted odd at start-up. (It seems exhibit this behavior only if it has been sitting for a few hours before I start it up.) When I start it, initially the revs sit around 1000, as it usually does. However, within a second or two, the revs start to drop quickly, falling below 500. Then, I guess some sort of anti-stall kicks in and the car revs itself up to around 1500. It will usually do this a few times. After less than 30 seconds, the revs stabalize at about 900. During this time I generally have the car in neutral with my foot on the brake and I am not touching the gas.

Once I start driving, it drives fine. I can't detect any noticable loss of power or decrease in mpg. Check control says that all systems are fine.

I am wondering if anyone has had a similar experience and if it's anything I should be worried about. I am not sure it is directly related to the replacement of the air intake filter, but it started doing this pretty much immediately after the filter was replaced. I did not remove the built-in charcoal filter. Any help anyone has would be appreciated.
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      10-15-2010, 03:07 PM   #2
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I heard (ON THE e46) that the oil on K&N filters gunk up the fine wire on the air flow meter. Check it out and use a cleaner, but be careful it is an expensive part. Also, I am not sure if this advice is relevant to the e90.
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      10-15-2010, 03:25 PM   #3
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I've been getting the same thing on my 335 for about two months now. I've got a MT as well. When I start it cold it will idle like an old diesel for about 30 seconds and then smooth right out. Does it every time. I've got the BT scanner and I'm not throwing any codes at all. I've brought it to the dealer twice now and they say they can't replicate it, which is BS. It's going in next week for squeaky breaks and I'm going to make sure it sits over night there and then the wait for me to get there to start it. It sucks that my two year old bmw ideals 10 X worse then my wives 8 year old subaru.
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      10-15-2010, 05:01 PM   #4
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Quote:
Originally Posted by Chriztofor View Post
I heard (ON THE e46) that the oil on K&N filters gunk up the fine wire on the air flow meter. Check it out and use a cleaner, but be careful it is an expensive part. Also, I am not sure if this advice is relevant to the e90.
I'll check the air flow meter. My gut feeling is that the oil wouldn't go through the charcoal filter, but it's worth a shot.
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      10-15-2010, 05:51 PM   #5
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The 3.0L NA uses a MAF, I wouldn't doubt it has oil on it. I would put a regular paper filter back in.
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      10-15-2010, 07:45 PM   #6
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I'll take it apart and take a look at it this weekend. Interestingly, it seems to be worse the colder the car is. I started up on the way home from work and it just had a little bit of a rough idle for the first 20-30 seconds. I had one quick stop on the way home and when I jumped back in and started it up, I had no problems whatsoever.
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      10-15-2010, 08:31 PM   #7
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If I do find the wire has the filter oil on it should I just wipe it off or is there something I should spray on it to clean it?
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      10-15-2010, 08:40 PM   #8
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Get MAF cleaner at your autoparts store. Your knock adaptation may be messing with you idle too. I have a bt scanner so I was able to reset mine. Fixed vibrations upon start up and jerking during deceleration.
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      10-22-2010, 05:51 PM   #9
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Put back in your stock filter and see if the problem goes away. If not it sounds like your HPFP could be going bad.
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      10-22-2010, 06:19 PM   #10
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Quote:
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Put back in your stock filter and see if the problem goes away. If not it sounds like your HPFP could be going bad.
He has a 330 so there is no HPFP.
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      10-22-2010, 11:17 PM   #11
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I've had the same problem since the dealer replaced the head on my 330i last December. Hasn't gotten worse (or better) and hasn't affected drivability whatsoever. Just an annoyance at startup.
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