EGR valve/tube cleaning and Seafoam Treatment - Mercedes-Benz Forum
 
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#1 (permalink) Old 12-01-2011, 09:25 AM
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EGR valve/tube cleaning and Seafoam Treatment

I removed my EGR valve yesterday. It looked horrible in the inside. Im hoping the valve has not died from ther carbon buildup.

Can anyone attest to this?

Also has anyone used seafoam in the gas tank. I havent looked in my heads as of yet to see my valves but I imagine there is sufficeint build up in there as well.


ANy pointers would be appreciated. Thankyou
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#2 (permalink) Old 12-01-2011, 10:24 AM
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I seafoamed my tank and upper intake. Use the brake booster line to pour the seafoam into the intake directly behind the MAF. I couldnt get the motor to stall, but turned it off and let it set an hour to let the chemical work. Fired it up, took it for a spin, and let the white smoke pour out! This is normal as it burns off all the crud and has never afffected my o2 sensors. May want to wait for a "quiet" to to do this though. All that smoke WILL attract attention!
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#3 (permalink) Old 12-01-2011, 02:18 PM
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Originally Posted by nrphlly View Post
I removed my EGR valve yesterday. It looked horrible in the inside. Im hoping the valve has not died from ther carbon buildup.

Can anyone attest to this?

Also has anyone used seafoam in the gas tank. I havent looked in my heads as of yet to see my valves but I imagine there is sufficeint build up in there as well.


ANy pointers would be appreciated. Thankyou
That's what happens to EGR valves, since they are processing raw exhaust. Remove the tube as well and clean both of them out, aerosol carb cleaner works pretty well. Some argue you can clean the tube in place on the car by spraying stuff down it, but you're dumping that clogged-up goo right into the intake manifold, where it has more of a chance of creating problems.

BTW, check the diaphragm on the EGR valve to be sure it's holding vacuum, no sense wasting any effort cleaning it if it leaks.

Seafoam in the tank is fine if the goal is to clean components and injectors. However, they actually make an aerosol decarboning treatment that is pretty easy to use in conjunction with the intake port for the crankcase breather hose. If your goal is decarboning, the aerosol treatment is a bit more even for distribution than the liquid.

Good luck.

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#4 (permalink) Old 12-04-2011, 03:52 PM
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Thankyou Codes

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Originally Posted by Check Codes View Post
That's what happens to EGR valves, since they are processing raw exhaust. Remove the tube as well and clean both of them out, aerosol carb cleaner works pretty well. Some argue you can clean the tube in place on the car by spraying stuff down it, but you're dumping that clogged-up goo right into the intake manifold, where it has more of a chance of creating problems.

BTW, check the diaphragm on the EGR valve to be sure it's holding vacuum, no sense wasting any effort cleaning it if it leaks.

Seafoam in the tank is fine if the goal is to clean components and injectors. However, they actually make an aerosol decarboning treatment that is pretty easy to use in conjunction with the intake port for the crankcase breather hose. If your goal is decarboning, the aerosol treatment is a bit more even for distribution than the liquid.

Good luck.
I have done this and the car is running normally again at top speeds.
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#5 (permalink) Old 12-04-2011, 03:55 PM
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Originally Posted by bobbyjo9 View Post
I seafoamed my tank and upper intake. Use the brake booster line to pour the seafoam into the intake directly behind the MAF. I couldnt get the motor to stall, but turned it off and let it set an hour to let the chemical work. Fired it up, took it for a spin, and let the white smoke pour out! This is normal as it burns off all the crud and has never afffected my o2 sensors. May want to wait for a "quiet" to to do this though. All that smoke WILL attract attention!

i am very scared to do that lol. I put it in the gas tank and it didnt give me any smoke but Im trying to get up enough courage to let the chemicals do the work in the walls of the cylinders
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#6 (permalink) Old 12-06-2011, 11:14 AM
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LOL.. I hear ya but combustion is combustion. You already introduced the chemical into the cylinders via the fuel, but this wont cause the "smoke". Its all the gunk that gets into the upper intake that your after by introducing via airflow that causes the "smoking" effect. Like I said I have done this on many different vehicles with no adverse effect. It is of course a "try at your own risk" process but thats your call. With those variable tuning vains in the intake, I like the thought of things clean as possible. If you do work up the courage and do it right, get ready to really freak when you see the smoke POURING from the back of your car for about 5 minutes or so!
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