MAS snorkel 98ml320 - PeachParts Mercedes-Benz Forum

nisan17 · #1 09-09-2006, 10:22 PM

While removing the snorkel to get at my EGR valve the tab on the bottom of the snorkel at the manifold snapped off. It 's the flat round piece about the size of a medium coin. Assembled now, the snorkel looks and feels very secure and stable. Is performance going to be compromised? Has this happened to any one else? Should I order a new snorkel? I don't think JB Weld would be strong enough!?

Thanks in advance,

mbdoc · #2 09-11-2006, 08:11 AM

JB weld can really secure non-moving parts if allowed to cure properly..time will tell..

richard28 · #3 09-11-2006, 11:06 AM

Nisan, would you please describe how to remove the snorkel-it seems very tight and I didn't know what to do. I have the code for a clogged EGR tube.Thanks.

nisan17 · #4 09-11-2006, 10:32 PM

The below is a clip and pasted composition from other posts and threads that I take and save into folders. So when it's time to work on that part I have the info at my finger tips. I didn't mean to confuse the MAS flexible intake ducting with the snorkel, but it was the ducting that was the bear to get out and upon doing so snapped off the tab. I don't have a MB manual yet so I try as best as I can to paint a mental picture when I study the posts.

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The Mercedes Service Manual for the M112 engine would be the best place, if it is anything like the manual that I have on the M115. Very detailed with pictures. The procedure is really easy, though. side of the engine. The valve is held by two torx-head bolts and The EGR valve is located on the rear of the passengers the flexible tube is attached to the intake manifold via a flange and two torx-head bolts. You have to remove the engine cover, the flexible intake ducting between the mass airflow sensor and manifold, and the wire to the EGR valve to gain access. I also found it easier to get to by removing the wire to the nearest fuel injector to gain access to the bolts and make removing the wire to the EGR easier. After that, you have to loosen the tube connection to the EGR valve, pull the wire to the valve, and the vacuum tube going to it. After that, remove the two bolts to take the valve off. Remove the two bolts in the tube flange and snake the tube out of the intake with a twisting motion (it is a complex shaped snorkel going down into the manifold probably about 8 inches). If it is clogged, you will see the carbon plugging the end after it is extracted. While you have everything off, take a screwdriver and delicated pry up on the diaphragm in the EGR valve and make sure it is free to move. That was what was wrong with my EGR valve itself. I put a new one on because it was in my hand and I got it cheap, but I could have cleaned the old one after freeing it up and probably been OK.

Easy job! However P0 400 doesn't mean that the valve is bad.
Most of the time you will find the EGR valve pipe clogged-up.

The valve is behind the RIGHT cylinder head.

richard28 · #5 09-12-2006, 10:12 AM

Thanks, Did you have to replace any gaskets or o-rings when you put everything back?

nisan17 · #6 09-12-2006, 07:38 PM

Richard,
I was going in there just to clean out the EGR tube(snorkel) when I was having trouble with one of the E12 torx bolts. It was pretty cramped under the ridged line near the last fuel injector. I was just going to get the new EGR valve and gasket and whatever else before I put more effort into. I was also going to get a smaller universal joint or whatever can get to that bolt without too much restriction.

YuCrew · #7 09-16-2006, 01:09 PM

Just thought I'd post some pics to help someone else who might be tackling the EGR. These comments apply to the V8.

I had to remove the coolant reservoir and the engine air supply duct. The pictures below show this duct. One screw near the tranny filler tub, one integral plastic clip to attach duct near top, center, rear of engine and one "clip" that is integral to the duct and "snaps" to attach duct to rear of engine. There is an arrow molded into the duct sort of pointing you to the general direction of this clip.

richard28 · #8 09-28-2006, 11:29 AM

I decided to let my indie handle this job, while I watched. He used a swivel and an E-10 socket to remove the torx bolts holding the snorkel to the tranny fluid tube, etc., and then he removed the snorkel (not so easy to actually remove it-he had to climb onto the engine bay to get the leverage to get it out) and relatively easily he wiggled out the egr tube. To his surprise it was not clogged, and then he found that the egr valve was not opening due to accumulated dirt. He had a new one on site, so he installed it. Check engine light now is gone, the engine is much peppier and, best of all, state emissions inspection was passed. If this happens again, I will tackle it myself. Thanks for all the information.

onesixthree · #9 09-29-2006, 02:07 PM

Yucrew, what year ml do you have? Your intake tube doen't have the silencer attached? Is there a part number stamped on the cap at the maf end of the tube? It's the black cap about 1inch in diameter.

YuCrew · #10 09-29-2006, 08:43 PM

1999 ML430. I don't know what the silencer is. Yes, I recall approx 1" cap. Can't help you with the part number as I'm out of the country today.

Silencer something useful and worth "adding"?

onesixthree · #11 09-30-2006, 09:27 AM

actually, i'm going to remove the silencer and plug it up.