Secondary Air System Carbon Build Up Removal Pictures - Page 6 - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #51 of 327 Old 12th November 2008, 06:15 AM
mottati
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Originally Posted by ChuckRoberts View Post
+1

I know that you don't want to say much about another persons car, but can you tell us what year it is?

Chuck
i've heard it's a 2002.

Mike

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post #52 of 327 Old 12th November 2008, 06:51 AM
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Originally Posted by jclyman View Post
It appears that the owner was just not running the car hard enough
exact same thing i was thinking as i scrolled through the pics.

as others have said - great post and info. thanks.
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post #53 of 327 Old 12th November 2008, 07:00 AM
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Well, perhaps I have not been paying attention, but this picture was a surprise to me!
A
Me too! did not know the ports were actually behind the valve. The e34 has them in the exhaust manifold, which seems much more logical.

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post #54 of 327 Old 12th November 2008, 07:17 AM
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here's a few pics for comparison from my engine. This was at 72k miles, almost 3 years ago. I was tracking the car pretty regularly, at least 4 weekends per year, combustion chambers were pretty clean (compared to merts pics) and the sec. air port was maybe 20% blocked.
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post #55 of 327 Old 12th November 2008, 07:19 AM
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Originally Posted by mottati View Post
Me too! did not know the ports were actually behind the valve. The e34 has them in the exhaust manifold, which seems much more logical.
I was always wondering where they were...I didnt see anything when I installed my headers.
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post #56 of 327 Old 12th November 2008, 08:09 AM
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Me too! did not know the ports were actually behind the valve. The e34 has them in the exhaust manifold, which seems much more logical.
I didn't realize the rich, fuel laden exhaust gas was ported directly into this cool air passage!

Seriously, I'd consider closing those little holes and keeping contaminants from getting itno the secondary passage.

And there is NO WAY i'd pay to have the system cleaned out... unless it was a $100 cpo co-pay!

A
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post #57 of 327 Old 12th November 2008, 08:11 AM
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I didn't realize the rich, fuel laden exhaust gas was ported directly into this cool air passage!

Seriously, I'd consider closing those little holes and keeping contaminants from getting itno the secondary passage.

And there is NO WAY i'd pay to have the system cleaned out... unless it was a $100 cpo co-pay!

A

+1
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post #58 of 327 Old 12th November 2008, 02:21 PM
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what a horrible, horrible design. I am curious though, why does this problem not appear often on the e39 540i which shares a very similar secondary air system?
Mark, the 540 DOES succumb to the same problem. As I said elsewhere, it is my belief that the problem is not as prevelent on the 540, but it does happen to the 4.4 as it happened to mine. If it is related to oil usage then I am a little surprised my 540 has the problem since it uses no oil whatsoever. Neither does my M5 (knocking on wood now). The 540s do get the same problem- obviously Mert's expert opinion would be great at this point on the "Why did this happen, to this car, to this extent?" If it is oil comsumption-related, then the fact that more M5s use oil might explain it? Mert, jump in at any point now that we know what the problem entails, give us the "How" and to what engines?

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post #59 of 327 Old 12th November 2008, 04:30 PM
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Yikes! Those pics are of such a nature that a few owner will lose sleep over them. Thank you very much for taking the time and effort to posting those.

I am curious to know how similar heads look for European M5's? If we can see some pics of a head taken apart on a few German cars, it could certainly confirm or deny the rumor that carbon build up can be prevented by extended driving at high RPMs and high speeds. It certainly have been seen before that autobahn driving takes care of carbon deposits in other engines.

Michael aka B8 Guru
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post #60 of 327 Old 12th November 2008, 05:48 PM
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Just thinking outside the box here...but what do you guys think of installing some sort of water injection system? Seems like it would keep the combustion chambers, pistons and possibly the intake and exhaust ports much cleaner. I would think that on a car that doesn't have clogged aux air ports, it might actually help keep them clear. Thoughts?

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