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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 10-10-2013, 11:50 AM   #1
zimzima330
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Join Date: Aug 2013
Location: new hampshire
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My Ride: 2005 330xi
Weird vibration when cold??

When i start my car in the morning, at idle you feel small vibration. Then i drive for about five minutes and vibration goes away. Almost feels like a wheel bearing but all of that is tight, and you feel slight vibration at idle so obviously not that.. Any ideas? Sorry guys it is a 2005 330 xi 3.0, Maybe i can get a replie now lol

Last edited by zimzima330; 10-10-2013 at 12:16 PM.
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Old 10-10-2013, 03:42 PM   #2
zimzima330
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Can someone please tell me why 40+ people have veiwed but no info?? Does there need to be more info provided? If so i wouldnt know what else to say.
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Old 10-10-2013, 03:59 PM   #3
Kubica
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It's the secondary air pump system. Normal vehicle operation.

Check passenger side motor mount too.

Last edited by Kubica; 10-10-2013 at 03:59 PM.
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Old 10-11-2013, 01:15 PM   #4
zimzima330
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Ok thanks.. Do you think something like that would throw c.e.l? I have no codes i dont know if that changes anything?
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Old 10-11-2013, 01:27 PM   #5
SamDoe1
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Quote:
Originally Posted by zimzima330 View Post
Ok thanks.. Do you think something like that would throw c.e.l? I have no codes i dont know if that changes anything?
If it's bad or not working, it'll throw codes. If it's fine, it won't which is where yours seems to be at.
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Old 10-11-2013, 03:44 PM   #6
zimzima330
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So that narrows down that. I wouldnt think it was a motor mount either since it only does it from dead cold start and only last for about first 5 minutes, after that is smooth as butter.. So lol back to square one, any other suggestions?
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Old 10-11-2013, 04:13 PM   #7
SamDoe1
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^ There's probably nothing wrong with your car dude. The SAP system that Kubica described before runs for 2-5 minutes at cold start to warm up the catalyst in your exhaust system to improve emissions. If you have a vibration for 5 minutes on a cold start, this is likely the reason for it and is completely normal.

If you want to be completely anal about it, go ahead and replace the SAP, valve, and hoses but there's really no reason to do that.

Also, if you are that concerned about it, please take your car to a qualified mechanic for him/her to look it over and see what the deal is. Diagnosing a car over the internet based only on the words written by a total stranger hundreds of miles away isn't the best way to solve a problem. We can offer help and ideas but only you and your mechanic (if you have one) can truly diagnose and resolve an issue.

Lastly, the reason 40 people looked and didn't answer is because they didn't know the answer. Would you rather have 40 replies saying they have no clue?

Last edited by SamDoe1; 10-11-2013 at 04:13 PM.
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Old 10-12-2013, 08:21 AM   #8
zimzima330
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Originally Posted by SamDoe1 View Post
^ There's probably nothing wrong with your car dude. The SAP system that Kubica described before runs for 2-5 minutes at cold start to warm up the catalyst in your exhaust system to improve emissions. If you have a vibration for 5 minutes on a cold start, this is likely the reason for it and is completely normal.

If you want to be completely anal about it, go ahead and replace the SAP, valve, and hoses but there's really no reason to do that.

Also, if you are that concerned about it, please take your car to a qualified mechanic for him/her to look it over and see what the deal is. Diagnosing a car over the internet based only on the words written by a total stranger hundreds of miles away isn't the best way to solve a problem. We can offer help and ideas but only you and your mechanic (if you have one) can truly diagnose and resolve an issue.

Lastly, the reason 40 people looked and didn't answer is because they didn't know the answer. Would you rather have 40 replies saying they have no clue?
That makes sense, now i know what the other guy meant by normal operation.. Well i just want to say thanks and i appreciate the info
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Old 10-14-2013, 10:56 AM   #9
Quinn325xi
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My car does the same thing. when its cold in the morning I can feel a slight vibration when the car is warming up. I just let it warm up for a minute and then it goes away. I also figured since it wasnt throwing any codes its probably nothing...
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Old 10-14-2013, 11:01 PM   #10
fafuture
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It is completely normal, I thought it was a problem when I first got my BMW also. You are good.
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Old 10-15-2013, 11:07 PM   #11
White_Knuckles
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Open the hood and find the canister shaped pump on the front, passenger side. Notice the sound when the pump spins up on a cold start and watch the thing vibrating in it's rubber damper mounting. Allow it it run its duration and you will have a positive diagnosis of your concern. It is normal to hear some noise and vibes but best to verify as some SAP's are excessively loud or torn from their damper kicking around in there.
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