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Old 05-30-2013, 10:55 AM   #1
Leppelin
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E46 P0411 code; How to check? Seafoam?

So a while back I pulled a bunch of codes and fixed my cracked intake boots. Now I'm still stuck with the P0411 Secondary Air code. Things I have noticed are that the code only reappears after a cold start, and the car is still a little sluggish during takeoff. With some research I found that putting seafoam in the hose coming off of the pump can clear the blockage.
What are the main things I should check for before pouring seafoam into it and giving my neighbors a smoke show? Also, what would be the best strategy to seafoaming it? Soaking overnight, how long should I run it for, or how many time to repeat the process?
Any input will help, thanks!
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Old 05-30-2013, 11:05 AM   #2
WDE46
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Check your SAP hoses. I'm not sure if your car has it (mine does not), but there also may be a small vacuum hose that's supposed to connect to a nipple on the SAP valve on the left of the engine block (looking from front bumper). That hose may have either come off or cracked. If there is no nipple, then it's not supposed to be there tho.

Since this is only appearing after a cold start, it has to be something with the SAP, since that only runs on cold starts.
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Last edited by WDE46; 05-30-2013 at 11:05 AM.
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Old 05-30-2013, 11:25 AM   #3
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Check the first link below in my signature. Pay careful attention to the SAP section.

Until you have all the broken and rotted hoses replaced and make sure the SAP pump is actually running, not since in worrying about O2 sensors.

Rubber and plastic hoses are usually the issue, especially the one along the valve cover.

OP will have the vacuum controlled Combi valve, only the later model 330's had no vacuum port on the Combi valve and they actually had a special MAF to measure the SAP airflow.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

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Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299

Last edited by jfoj; 05-30-2013 at 11:26 AM.
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Old 05-30-2013, 12:19 PM   #4
Leppelin
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Here's two pictures of my valve (hopefully they show up). It doesn't look like theres a "nipple" on that side of it. I did make sure to see if the pump was blowing any air, also. What else would there be to check?
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Old 05-30-2013, 01:01 PM   #5
jfoj
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If you have the quick couplers on your hoses vs, standard hose clamps then your SAP Combi valve is not vacuum controlled.

I understood that it was mainly the later model 330's that did not have the vacuum controlled SAP Combi valve, however, your does not appear to have a vacuum controlled Combi valve.

Not sure if your car is a M54 or M56 SULEV motor??

Anyway, since your Combi valve is not vacuum controlled, it simplifies things a bit.

Here are the possible issues.

1. Combi valve clogged/stuck, does not happen often.
2. Air pump output hose cracked/broken, fairly obvious, does not happed often.
3. SAP pump not running, fuse, relay or frozen bearings. If the pump runs, then it pretty much eliminates all the items I just mentioned.
4. MAF for the SAP input. These do fail, I had to replace mine on my 330 this Winter. Costs about $70 from BMAParts using discount code SPECE30.
5. Possible O2 sensor issues, not likely, but you need to rule out everything in 1-4.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 05-30-2013, 01:04 PM   #6
Weste46
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Re: E46 P0411 code; How to check? Seafoam?

Just delete the SAP, done deal.
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Old 05-30-2013, 01:34 PM   #7
Leppelin
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If there was blockage, what symptoms would I experience? I'm thinking that I will try the seafoam trick soon, but from what I understand, the SAP has nothing to do with performance. What could be causing my car to be sluggish during takeoff? The intake boots are brand new and the DISA is perfectly okay.
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Old 05-30-2013, 02:13 PM   #8
WDE46
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nipple nipple nipple
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Old 09-18-2013, 12:21 AM   #9
330iBlue
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I have the same code coming up P0411 and no nipple ( quick couplers ). Be for I replace MAF on the SAP unit, is it ok to use sea foam to try to clean it out first?
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Old 09-18-2013, 05:20 AM   #10
jfoj
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If you have the later version SAP and the pump only runs for a short time frame, you need to replace the MAF for the SAP system. Forget the Seafoam, it will be a waste of time and money in this situation.

See this thread - http://forum.e46fanatics.com/showthread.php?t=965526
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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