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#41
12-27-2015, 10:43 PM
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Finally took the plunge and started tackling the replacement of my vacuum hoses after the dealer kindly offered to replace three for only $800! At that point I graciously declined and upon picking up the X5, I strolled over to the parts dept and ordered up all the parts I needed for less than $150. Fast forward to this weekend and I'm about half way through. Since I wanted to replace all the lines I pulled off the manifold to get access and at this point I've got all the lines replaced except for four. Now I'm just waiting for some extra "black" and "blue" vacuum lines to come in on Tuesday to finish the job. Of course as I started removing the manifold, throttle body and a few other parts, I decided it would be the perfect opportunity to do some carbon cleanup. Let me just say this is not fun at all. Eventually I decided to try using Acetone and that did the trick. Easily cut through the carbon and softened up the thicker areas with ease. After a couple hours of toothbrush cleaning, I had like new swirl flaps, EGR valve and throttle body ready to install. As for the manifold, I had some Acetone soaking on the inside for a little while and now I currently have it submerged in degreaser to help loosen everything up. Depending on the outcome tomorrow, I may or may not opt to have it sonic cleaned. Anyways, here's some photos to show some of the progress I've made: The original reason for tackling this job. BMW warranty apparently doesn't cover vacuum lines as they are "wear and tear" items.  Manifold removed  Ready to remove swirl flaps  Swirl flaps before/after     EGR & throttle body before/after     
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#44
12-28-2015, 09:27 PM
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Intake Manifold Decarbonization
After 2 days of soaking and 3 hours of scrubbing and pressure washing, I've finally got the intake manifold near completely free of carbon deposits. All I have to say is thank god I'm done!!!!!!! This process was very laborious and needless to say I could really go for some hot tub time right now with an ice cold Peroni. Anyways, after all the mess, numerous rags and a contact high from an assortment of degreasers even through my painters mask, I couldn't be happier with the results. I just finished drying out the manifold and reinstalling the swirl flap assembly back into place. My new, repurposed acronym when working on the BMWs: TGIF - Thank God I'm Finished Onto what you guys really care about....      
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#45
12-29-2015, 10:21 AM
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Also believing in preventative maintenance, myself, I was curious your milage to have an idea of how bad mine might be. I understand each car is different and fuel types differ and environmental conditions also varying, but its good to have an idea of the buildup involved.
I see this is taking some time to do, are these "day" projects? If i put myself to it, can I get it out cleaned and back in in a day or even maybe a standard weekend? What service manual are you using? Or are you just methodically disassembling and reassembling? Good info, thanks for the pictures.
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#46
12-29-2015, 12:59 PM
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So the mileage in the X is just about 73k and from my understanding a lot of the mileage came from the previous owners doing travel on the highways. Most of the mileage I have added since ownership has been highway as well and will continue to be. Another thing is that we take ours up the mountains often which surely adds additional loads.
As for this project, I would consider it a two days project primarily because you'll need to soak the manifold overnight at a minimum. This helps soften the carbon deposits and makes removal far easier. It took me a total of around 2-3 hours just to clean the manifold. Add another 2 hours cleaning the EGR/throttle body and swirl flaps, this alone accounts for a good deal of time. I have not been using a service manual as things are relatively straight forward and removal of the manifold doesn't take much time. All that being said, this could definitely be a weekend project and in my eyes well worth it in the long run. I've been thinking of picking up another manifold and offering an exchange program so people wouldn't have to deal with the cleaning process but I'm just not sure if the interest is there at the moment.
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#47
12-29-2015, 02:12 PM
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In my experience the best chemical to use to remove soot deposits is acetone. I've tried multiple chemicals to clean the MAP in my diesel engines and throttle body cleaner is the only one that does the job effortlessly. TB cleaners is primarily acetone.
In your quest, did you find something else working better than others?
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#48
12-29-2015, 02:24 PM
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Acetone was by far the best. Melted the carbon deposits away. I tried several degreasers and Acetone was by far the winner. For the swirl flaps you could literally submerge them in Acetone and then just using a brush agitate the deposits away.
As for the manifold I just poured Acetone in it and let it set for a while upside down on my bench and then worked it with an assortment of brushes I got from Harbor Freight. This was after I submerged the manifold for 2 days in simple green commercial grade degreaser. This combination seemed to work pretty good.
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#50
12-29-2015, 02:29 PM
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Quote:
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