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  #1  
Old 06-04-2007, 11:10 PM
tbenner's Avatar
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1995 E320 Wgn EGR code fixing and clearing it

Greetings to all!

First, Thanks for the forum! Without it I would not have had the confidence to buy a MB. I love this car.

I am the proud new owner of a 95 E320 wagon with 138k on the odo. Then the engine light comes on and I'm not quite as proud. The car runs great except for the check engine light and needing to hold the accelerator down when starting warm. Is that normal?

I searched and found that I could get the code from the square-ish box in the battery compartment. It returns 5 flashes from the LED which I think means Exaust Gas Recirc Fault. Please correct me if I am wrong. I am a complete newb to MB. I have done major work to my Triumphs but that is extremely old technology.

Tonight I am soldering up the LED/button/banana plug circuit I saw on the forum, but I didsn't see or maybe didn't understand how to use that to clear the code after I clean the EGR tube. Can someone point me to a thread that explains that?

Second, Is the EGR tube the tube that comes from #4 header? Do I just pull it and ream it or is there more to it? I really don't want to be a PIA... just need to get a start.

Any advice and suggestions on manuals for this car will be deeply appreciated!

Tim Benner
Dayton, Ohio

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  #2  
Old 06-05-2007, 05:31 AM
Pete Geither's Avatar
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Tim, Welcome to the forum and use the resourses here to keep you in love with the Benz. Definately use the search function on your EGR questions. That topic has been beat to death and everything you want to know is there. Enjoy.
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  #3  
Old 06-05-2007, 10:19 AM
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This is the thread you want to look through: http://www.peachparts.com/shopforum/showthread.php?t=107630

As far as dealing with Code 5... this is usually a plugged up EGR circuit. If you follow the 3-foot tube that snakes from the EGR valve to the intake manifold, the blockage is usually within the first few inches of the tube where it connects at the intake manifold. This is a bear to get at. Many people snake an old speedometer cable from the EGR end of the tube to ream out the blockage.
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Old 06-05-2007, 10:38 AM
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Thanks for the info! I really appreciate it. I can't wait to get off work and fix it now. It may be a nexessary evil, but if I use a speedo cable to push the blockage from the tube, won't the debris from the tube be sitting in the intake manifold waiting to be sucked into the cylinders?

Tim Benner
95 E320 Wagon
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  #5  
Old 06-05-2007, 10:51 AM
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Never ASSUME the egr tube is blocked until you do a simple flow test..EGR on 104.992 engines had a factory TSB change-out for Sticking EGR shaft and a new modified EGR with a larger shaft clearence solved the problem.
Pull a vac at egr activation port w/hand pump while car is at idle..if engine attemps to stall/rough running, you do not have a blockage at he tube. If the tube is blocked , then hand activation of the EGR will result in very little engine rpm change. [ b/c the blockage stops the air from open egr being sucked in, not allowing a lean condition..
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  #6  
Old 06-13-2007, 08:27 AM
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EGR tube is definitely blocked...concerns

I finally had a chance to hook a vac up to my EGR valve. It makes a pop when vac is applied and a good audible thunk when vac is released. So it should be OK. With the car running, applying vac to the EGR produces no change in the idle at all so I will plan to snake a cable through there and clean it out.

My concern is, what will happen to all of the debris that gets worked loose during cleaning? It would be best that these 'crumbs' did not get sucked into the engine right? I have some small attachments for the shop vac that could be used to try and pull the debris back out the bottom of the tube. Could the suction from the shop vac cause any problems?

Thanks,

Tim Benner
1995 E320 Wagon
1967 Triumph Spitfire
1997 Volvo 850 Wagon
2003 Montero Sport
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Old 06-13-2007, 09:37 AM
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You need to disconnect both ends of the pipe. The intake side may look impossible at first but it's not. It's attached with two 10mm(?) bolts, the front one is accessible from the top but the rear one is easier to get from below. The obstruction may actually be in the intake near the end of the pipe rather than in the pipe. You need to just clean it out as best you can. A drill bit can help to bring out the debris. It's not the end of the world if a little falls in. There is a new style pipe that is less prone to getting clogged, a little over a hundred dollars I believe, but the intake pipes have to come off to get the old one out and the new one in.
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Old 06-13-2007, 02:01 PM
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Ideally, you'd like to have the debris not get ingested into the engine. But it's not a big deal if it does. The debris is relatively soft organic material that won't harm the engine as abrasive debris can.
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  #9  
Old 06-13-2007, 02:09 PM
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Make yourself a vac hose adapter to size down to an air hose and use that while you get the stuff loosened.it will suck it up.
I use that flat vac attactment and stick the air hose in the end and block off the remainder of the slot with duct tape..works fine...sometimes I just use a piece of 3/8" copper tubing..you can bend it to shape so it will get down where you need it..

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