Secondary Air System Carbon Build Up Removal Pictures - Page 33 - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

 36Likes
Reply
 
LinkBack Thread Tools Rating: Thread Rating: 2 votes, 5.00 average. Display Modes
post #321 of 327 Old 6th February 2019, 09:27 PM
Trizzuth
Senior Member (>500)
 
Trizzuth's Avatar
 
Join Date: Sep 2017
Location: Masshole
Posts: 544
Thanks: 0
Thanked 25 Times in 24 Posts
Garage
Just coming across this glorious thread.

So if your block secondary air ports are clogged with carbon, which then kills your pump, is buying a replacement pump completely useless at that point and the only real solution to plug the holes up and tune the SAP out?

New (old): 2003 E39 M5 TiAG
Old: 2001 E46 330i Steel-Grey Metallic (Totalled)
Trizzuth is offline  
Sponsored Links
Advertisement
 
post #322 of 327 Old 6th February 2019, 09:28 PM
mgdmb
M5 Guru (>2000 posts)
 
mgdmb's Avatar
 
Join Date: Feb 2007
Location: Campbell, CA
Posts: 3,571
Thanks: 280
Thanked 515 Times in 470 Posts
Secondary Air System Carbon Build Up Removal Pictures

Yes, or just code it out and pull the salmon colered relay in the dme box

Last edited by mgdmb; 6th February 2019 at 09:29 PM.
mgdmb is offline  
The Following User Says Thank You to mgdmb For This Useful Post:
josiahg52 (8th February 2019)
post #323 of 327 Old 7th February 2019, 02:38 PM
Trizzuth
Senior Member (>500)
 
Trizzuth's Avatar
 
Join Date: Sep 2017
Location: Masshole
Posts: 544
Thanks: 0
Thanked 25 Times in 24 Posts
Garage
Love this thread, finally finished making my way all the way through it.

The only thing I can contribute here is that I am in agreement that the massive carbon buildup on the original engine pics has to be from oil blow by on the piston rings. My wife had a 2001 E46 325iT wagon and she made many many frequent trips just down the street to bring the kids to school, to pick up something random, go to the store, we only live about 2-3 minutes form most stores. I am pretty certain that this exacerbated the known piston ring issue on the M54's and she had consistent oil burning on that car after we had it about 3-4 years. Opening up the valve covers on this car did show some carbon buildup around the vanos area, but the external vanos housing is a non-moving part and it was not a big deal there. Cams and lobes all looked totally fine and anything that would move a lot had zero carbon chunk like this, but I never inspected the piston heads or actual valves on that car. I assume they were pretty bad. I pulled the plugs once and it looked like the bottom of a shrimp boat they were so bad, almost like barnacles growing on the plugs! That issue turned out to be a bad crank sensor that was causing the car to run rich and toss carbon into the cats which ultimately destroyed the cats. Car would randomly backfire on the highway and it felt like the transmission was going to drop out of the car.

Plug pics for reference:



My point is, that car had many trips where the engine was not properly warmed up and that allowed the condensation to mix with oil and cause some sludge that likely contributed to the piston ring blow by issue and made it worse. BMWs in particular need to be warmed up good, the CCV system isn't necessarily optimal, but it's way better on the S62 than it is on an M54 engine.

New (old): 2003 E39 M5 TiAG
Old: 2001 E46 330i Steel-Grey Metallic (Totalled)
Trizzuth is offline  
 
post #324 of 327 Old 7th February 2019, 02:40 PM
Trizzuth
Senior Member (>500)
 
Trizzuth's Avatar
 
Join Date: Sep 2017
Location: Masshole
Posts: 544
Thanks: 0
Thanked 25 Times in 24 Posts
Garage
Here were the plugs on my 2001 E46 330i back in 2008 with about 120K on them, original plugs, minimal oil burn, just for comparison:

New (old): 2003 E39 M5 TiAG
Old: 2001 E46 330i Steel-Grey Metallic (Totalled)
Trizzuth is offline  
post #325 of 327 Old Yesterday, 10:28 PM
weeto
Junior Member, warming up (<31 posts)
 
Join Date: Feb 2010
Location: houston
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
hi all, well i just got the stupid low flow code, fixin to round up materials and get ready to perform the bypass. fingers crossed and hope it works, thanks sailor
weeto is offline  
post #326 of 327 Old Today, 02:43 AM
Sailor24
M5 Expert (>4000)
 
Sailor24's Avatar
 
Join Date: Oct 2010
Location: Cobourg Ont
Age: 57
Posts: 9,661
Thanks: 985
Thanked 1,964 Times in 1,648 Posts
If it just popped up diagnose it. The code does not just pop up. It appears you clear it, then it does not show again for a bit. When the blockage is just at the threshold it will not be a constant code. If a vacuum line fails or your fan is weak, a valve is sticky then it will be constant, but those issues are sortable.
Good luck and don't forget just coding out the code is an option. Just because it does not work with my form of OCD does not mean it might not work with your version.
Sailor24 is offline  
post #327 of 327 Old Today, 03:43 PM
EpicM
Member, Sport: On DSC: Off
 
Join Date: Feb 2016
Posts: 209
Thanks: 12
Thanked 7 Times in 7 Posts
I am about to pull the engine to inspect clutch and rod bearings. Car has 150k miles. I wonder if it is worth pulling the heads to clean out the SAI ports, get the heads rebuilt. What does a typical head rebuild cost? Thanks.
EpicM is offline  
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the BMW M5 Forum and M6 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 3 (0 members and 3 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes Rate This Thread
Linear Mode Linear Mode
Rate This Thread:



Similar Threads
Thread Thread Starter Forum Replies Last Post
Cleaning Carbon in secondary air system DanQ E39 M5 and E52 Z8 Discussion 17 9th January 2016 07:01 PM
Secondary Air System, Valve Sticking mjshira E39 M5 and E52 Z8 Discussion 17 24th October 2013 01:50 PM
Secondary Air System - Not CBU everycredit E39 M5 and E52 Z8 Discussion 27 27th February 2008 02:17 PM
Secondary Cat Removal - HP and Noise Gains Wolverine E60 M5 and E61 M5 Touring Discussion 15 27th August 2007 09:52 AM
Concern: Supersprint Headers Coupled w/ Removal of Secondary Cats KeithTa E63 BMW M6 Forum and BMW M6 Convertible | m6board.com 2 21st June 2006 07:24 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome