Secondary Air System Carbon Build Up Removal Pictures - Page 5 - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #41 of 327 Old 11th November 2008, 11:58 PM
Capt. Willard
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I wonder what dumping some marvel mystery oil or seafoam into the gas would do to help the valves, piston tops and cylinder heads? Some folks swear by the stuff.

Last edited by Capt. Willard; 12th November 2008 at 12:09 AM.
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post #42 of 327 Old 12th November 2008, 01:38 AM
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Flat out the best post I have ever read on any topic! You did an incredible job with this Mert. The forum definitely owes you a debt of gratitude. My hat is off to you, sir!


Bill

/// 2000 M5 black on black (sold)
/// 2002 540i Sport Topaz blue
2000 540i Sport Orient blue

Last edited by BMW x 2; 12th November 2008 at 02:12 PM.
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post #43 of 327 Old 12th November 2008, 02:27 AM
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Flat out the best post I have ever read on any topic! You did an incrediblejob with this Mert. The forum definitely owes you a debt of gratitude. My hat is off to you, sir!


Bill
+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

03 Carbon Black/Caramel - Toy
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post #44 of 327 Old 12th November 2008, 02:59 AM
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Just an FYI for those who may have the SES on because of a p0411 code, YOU CAN STILL PASS SMOG IN CA. All you need to do is warm up the car, clear the codes, drive about 10 miles, check the DME that all systems are complete and you'll pass. The key is that all systems have completed.

Obviously staring at an SES light is annoying at the least, so I would still suggest doing the powerchip or bmw fix, but if you have smog coming up at least you know now.

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post #45 of 327 Old 12th November 2008, 03:34 AM
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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?
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post #46 of 327 Old 12th November 2008, 05:00 AM
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So what does all this mean to a guy like me:
I live in S. Florida where a cold start is 55F
We don't have emissions testing any longer
I just bought my M5 10 mos ago it has just over 20k miles.
Its driven daily now and I enjoy the full sweep of RPM

If I wanted to avoid this early-what should I do. Powerchip workaround? Do nothing?
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post #47 of 327 Old 12th November 2008, 05:11 AM
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Do nothing?
Exactly that. As a percentage of M5s out there, the ones affected by this issue is very small. Forget about it and enjoy the car.

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post #48 of 327 Old 12th November 2008, 05:18 AM
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great work mert.

questions:
1. any idea if the car ever had the "implausible coolant temp" error code (i.e., thermostat stuck open)?

2. do you have a rough idea of the owner's driving style?

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post #49 of 327 Old 12th November 2008, 05:42 AM
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I still wonder if the fact that most of our cars burn 1+ quart of oil per 1000 miles doesn't have more to do with this than the fuel. This motor looks just like the insides of the passages of a rotary Mazda motor (which by the way injects oil directly into the combustion chamber)

Just a hunch.....

RR

PS do you know the oil consumption on this motor?? and thanks so much for the info!!!
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post #50 of 327 Old 12th November 2008, 05:52 AM
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WOW ....looks like someone just SH!T on the engine. Does seafoaming the engine help at all getting out some/most of the carbon? Have you guys tried it?

Last edited by ppatel9; 12th November 2008 at 05:53 AM.
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