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Old 04-04-2001, 11:22 AM
Registered User
Join Date: Mar 2001
Location: New Jersey
Posts: 59
Car is a 98 E300D. What is an ERG valve, and what causes it to get clogged. Can running the engine with it clogged cause any damage? And, generally, how often does it clog and have to be replaced? Thank you....RSL007
1999 ML430
2001 C320 Sport
2000 SAAB 9-5
1998 E300DT
1998 C280sport
1991 300D
1991 350SDL
1982 300DT
1972 Porsche 911 Targa
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Old 04-04-2001, 12:06 PM
Dr Parts
Posts: n/a
I Think you mean EGR valve not ERG is that correct? The EGR stands for Exhaust gas recirculation. I am just a parts guy so what the fuction and cause might be I don't know. I did look it up in the film on your car and your car has it built into a exhaust line. I have a picture here if you would like it faxed to you just e mail me your fax number.
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Old 04-04-2001, 12:10 PM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 11,246
It is called an EGR valve

which stands for exhaust gas recirculation. Cars in the US have had this device for quite a number of years. It allows air from the exhaust manifold to flow into the intake manifold which is supposed to reduce the amount of NOX (I think) generated during the combustion process. Over the past few years industry has started doing the same thing on steam boilers to reduce the NOX emissions. It actually has a "cooling" effect in that application and you set it up based on exit gases O2. I know that the EGR valve is controlled off of vacuum but am not sure how it knows what % open to put the opening of the valve. Someone else will have to explain that.

Race cars and vehicles in Europe do not have this device.
I would advise keeping this system in working order on the late model diesel. Just clean everything up. It will more than likely plug again.

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Old 04-04-2001, 05:49 PM
MBenzNL's Avatar
Join Date: Jan 2001
Location: the Netherlands
Posts: 1,417
European MB models suffer from this EGR valve since about 10 years now and I think that the % of opening is determined by the O2-sensor and the pressure-sensor in the air intake.
Since I didn't want my car to mess up the entire air-intake system I dismantled the EGR valve 280.000km the engine in my car doesn't have to bite its own dust anymore...

1990 300SL-24
1993 C250D
with a minor 600+k kilometer
(the Netherlands)
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