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Old 02-27-2013, 12:37 PM   #1
joneill1975
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VANOS seal?

My 2004 330ci with an m54 and 93k miles on the odometer "stumbles" after starting it on a cold morning. It repeatedly does this until the car warms up.

The first video shows the rpms dropping as the car idles.



The second video is of the engine showing the fuel pressure, but you can hear the engine stumbling.



Are the Vanos seals causing this?
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Old 02-27-2013, 12:40 PM   #2
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Vanos seals should be replaced anyway as it is a known problems. Other performance-related problems can usually be fixed with simple maintenance that's required anyway. Once you do the stuff the car needs anyway then you still have problems, then try and diagnose. At least at that point, you'd have taken care of essentials and you can now rule maintenance out.

Example: fuel pressure and volume. not having enough of either can cause performance problems and lean codes. it can also leave you stranded.
example: vacuum leaks. depending on the particular leak/tear, your car can stumble/stall because unmetered air is wreaking havoc on your fuel mixture and the car will basically choke/suffocate and stall/stumble depending on the severity. simple stuff.

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Old 02-27-2013, 06:03 PM   #3
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Thanks, but I trying to diagnose this particular problem. I know the symptoms I am having were due to the Vanos seals in earlier E46's, but not in later E46's.

Do the videos indicate a vanos seal problem or is it something else?
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Old 02-27-2013, 06:05 PM   #4
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Originally Posted by joneill1975 View Post
Thanks, but I trying to diagnose this particular problem. I know the symptoms I am having were due to the Vanos seals in earlier E46's, but not in later E46's.

Do the videos indicate a vanos seal problem or is it something else?
Again, lack of proper maintenance can cause the problems you describe. Vanos seals are known to be a common failure point on E46s so it's something you would need to do regardless of whether or not you had this particular stumble. Most of the stuff that affects performance is cheap. Start with fuel delivery and filtration first.
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Old 02-27-2013, 06:07 PM   #5
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Mine does the same. Has the same mileage too.

I'm thinking it's down to IAC or DISA.
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Old 02-27-2013, 06:08 PM   #6
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I'd be looking at the IACV, the DISA, or a blockage in the secondary air pump plumbing.
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Old 02-27-2013, 06:21 PM   #7
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I know I should probably do the VANOS seals regardless, but I am asking if the symptons that I have in the videos are most likely caused by VANOS seals or could they be caused by something else?
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Old 02-27-2013, 06:23 PM   #8
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I don't see how this can be Vanos related.
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Old 02-27-2013, 06:25 PM   #9
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You do know what the function of the vanos seals is, right? With leaky seals, the sprocket that controls the camshaft is basically jerking back and forth. when you warm up, seals expand and sealing ability is restored. this is the theory behind the lumpy idle while cold. of course a vacuum leak can cause similar problems. YOU NEED TO DO EVERYTHING!
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Old 02-27-2013, 06:32 PM   #10
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Have you cleaned your ICV and throttle body ever? What about the SAP MAf sensor? Our car has two MAF sensors. One main one on the intake and another on the SAP.
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Old 02-27-2013, 06:52 PM   #11
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Yes, they have all been cleaned. I have a new DISA and no vacuum leaks.

E46Mango....from your post above I believe you are saying that you are leaning towards the VANOS seals as the potential cause of the issues in the videos....am I understanding this correctly?

Last edited by joneill1975; 02-27-2013 at 06:52 PM.
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Old 02-27-2013, 06:58 PM   #12
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Yes, they have all been cleaned. I have a new DISA and no vacuum leaks.

E46Mango....from your post above I believe you are saying that you are leaning towards the VANOS seals as the potential cause of the issues in the videos....am I understanding this correctly?
I cannot see your videos. I am only going by your description in the first post. I'll try to check it out later. but again, you need to do it all. there's no negotiating this!
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Old 02-27-2013, 07:05 PM   #13
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Originally Posted by E46Mango View Post
I cannot see your videos. I am only going by your description in the first post. I'll try to check it out later. but again, you need to do it all. there's no negotiating this!
His RPM is jumping between 600 and 800 at a rate of 0.5 - 1 Hz.
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Old 02-27-2013, 07:05 PM   #14
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Have you read this yet? it describes symptoms well.

http://www.beisansystems.com/procedu..._procedure.htm
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Old 02-27-2013, 07:58 PM   #15
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lszlszx....Thanks and yes I have read that link. That is where I found that the symptoms I am having were very common in early E46's and not as much in later E46's (I have a 2004 M54 3.0L).

Dave1027.....why do you think this is not Vanos related?

E46Mango.....Please take a look at the videos when you are able. I am trying to pinpoint the problem as much as possible and the videos show the issue very clearly.

Last edited by joneill1975; 02-27-2013 at 09:40 PM.
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Old 03-04-2013, 10:42 AM   #16
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Bump....
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Old 03-05-2013, 10:28 AM   #17
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i have this exact same issue. im not sure if you have an automatic or a manual. but i have the auto and it effects the takeoff. i almost have to floor it so it wont do that from a stop.
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Old 03-05-2013, 01:24 PM   #18
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Originally Posted by joneill1975 View Post
Dave1027.....why do you think this is not Vanos related?
Turns out I could be wrong but I would do the simple things first like IACV and DISA before going after the vanos.
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Old 03-05-2013, 01:31 PM   #19
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Quote:
Originally Posted by joneill1975 View Post
Thanks, but I trying to diagnose this particular problem. I know the symptoms I am having were due to the Vanos seals in earlier E46's, but not in later E46's.

Do the videos indicate a vanos seal problem or is it something else?
That first video looks like you have a vacuum leak, do a smoke test.
It could also be the vanos seals but I'd check the vacuum hoses first, is easier and faster/cheaper to repair.
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Last edited by Eliott's-BMW; 03-05-2013 at 01:32 PM.
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Old 03-05-2013, 05:13 PM   #20
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Where is the best place to buy VANOS replacement parts? Vanos rebuild kit?
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