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Is there any how to instructions available on the M177 for cleaning the intake valve carbon build up?
I've tried to find some one in my area that preformes walnut-blasting without any sucess and the only one I've found is 4 hours away.
I've seen some attemptes on youtube with chemichals and it seems a good attempt on cleaning them. It wont be as good but better than nothing
But I'm wondering if there is any specific videos or threads for the C63s?
On were to spray the chemichals so that it would be as efficient. I dont want to put it in the gas tank and hope for the best
The engine has direct injection. The additive will not clean the valves as it will go directly to the consumption chamber.
Thats exactly why I dont want to put the additive in the tank as I have written. But if you spray it directly in the motor like the enclosed video, but after the MAF it does the job pretty well
The problem is that I dont know were the MAF is located in the M177
I have found this wich is for E63 but they have the same motor, wich is the M177 https://wright-company.net/wp-conten...017/02/E63.pdf
Poor MPG and that the car has gone short trips. I have 6km to my work so the car never gets up to operating temp. Wich usually is a reason for carbon build up.
I have a nother C63s but from 2017 with much better MPG and the car has gone highway miles, long trips.
I see clear difference between the two cars. Mostley the MPG but also al little bit in sound
Even if I dont have "proof" of carbon build up I want to clean it and be proactive. I see it like regualr maintenece and like cleaning the engine bay
I think I’ve located the MAP sensors
if I were to follow instructions on the CRC chemicals(spray past the sensors) it means I need to take of the air filter housing and spray directly in to the turbos
Am i right?
Reset ECU, do transmission relearning, use premium fuel, heat the car to operating temperature and do some high rpm runs.
Originally Posted by Amme
I think I’ve located the MAP sensors
if I were to follow instructions on the CRC chemicals(spray past the sensors) it means I need to take of the air filter housing and spray directly in to the turbos
Am i right?
Reset ECU, do transmission relearning, use premium fuel, heat the car to operating temperature and do some high rpm runs.
I agree with you 100% but this isn’t a case of being broken or not. It’s a case of maintenance
You don’t drive your car trough the rain in 100 mph and hope it gets cleaned, you wash the car. I’m just looking to clean the intake valves, even if the build is minimal. I can’t find a shop who does it near me so I figured I give it a try with chemicals
Ok I’ve done some more research and it’s harder than I thought
the turbos are located after the air filter intake but it won’t help to spray there cuz after the MAP sensor the air goes through intercoolers before entering the intakemanifold
Enclosed pic I have marked intercooler as #3 and the intakemanifold as #2. I need to spray the chemicals at the arrow marked #1 which is located very low in the engine bay with a lot of things to remove
Ok I’ve done some more research and it’s harder than I thought
the turbos are located after the air filter intake but it won’t help to spray there cuz after the MAP sensor the air goes through intercoolers before entering the intakemanifold
Enclosed pic I have marked intercooler as #3 and the intakemanifold as #2. I need to spray the chemicals at the arrow marked #1 which is located very low in the engine bay with a lot of things to remove
I think your diagram is correct on where you need to spray the cleaner (arrow 1 on the picture with engine) but from the looks of it you don't need to remove anything but just loosen the clips enough to stick the straw in to spray.
I think your diagram is correct on where you need to spray the cleaner (arrow 1 on the picture with engine) but from the looks of it you don't need to remove anything but just loosen the clips enough to stick the straw in to spray.
I think you're right but its hard to get to. Very tight and low down in the engine bay
Suggestion, If you are able: if you do get to the map sensor 1 and have room to spray the cleaner in - before you do, would be great if you can use a small borescope and stick it in the sensor hole and see if you can get some 'before' pics of the intake valves and exactly how much build-up is there.
before you do, would be great if you can use a small borescope and stick it in the sensor hole and see if you can get some 'before' pics of the intake valves and exactly how much build-up is there.
Thats the plan. I’m searching for an inexpensive borescope. So far I’ve only found cheap ones on Wish but a bit skeptical. Will post pics if I find one for sure
Thats the plan. I’m searching for an inexpensive borescope. So far I’ve only found cheap ones on Wish but a bit skeptical. Will post pics if I find one for sure
I believe Harbor Freight has some inexpensive borescopes - amazon for sure would have some. I think it's probably worth getting your eyes on a few valves before undertaking the cleaning, because you may have very little (if any) carbon build up. It hasn't been an issue with M177's, but then again, not many people have put enough miles on to necessitate a cleaning (if even necessary).
When I had my E92 335i, I had my intake valves walnut blasted under warranty by BMW right around 50-60k miles. It was pretty dirty and I could feel the difference after the cleaning.
Should be able to get in a vac hose somewhere, the map sensor should be after the intercooler, I would have thought. Didn't know the M177 had 4, are you sure the others aren't boost pressure sensors?
Carbon buildup doesn't seem to be a particular issue on this engine, but forget about spraying crap in there and hope it cleans it. It's all snake oil mostly. The only proper way to clean the intake valves is to take off the intake manifold. The two methods used are blasting it with walnut shells, or soaking it in chemicals first and then scrape out the build up. I've had it done on my 2013 Audi RS5 at 60k miles and it did make a noticeable difference in performance. They recommended to do it every 30k miles, so I should have done it earlier. The shop that did it for me used the soaking and scraping approach. BMW includes walnut shell blasting in their scheduled maintenance and they do it when it's due, because their engines are known for having this problem. Not sure if it's still an issue with the latest engines. There have been several mitigations to minimize or avoid it. With turbo engines it seems to be less of an issue, because a lot of air is pumped through under pressure blasting out the build up before it can settle. Might wanna consider a regular Italian tune up if you only drive short distances. As they say, a redline a day keeps the mechanic away.
Last edited by superswiss; Dec 8, 2020 at 08:03 PM.
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