Does the exhaust gas that's recirculated have adequate oxygen to support efficient combustion in the cylinder? I'm trying to understand how exhaust air can possibly add anything to combustion.

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2009 E320 Bluetec 117,000
1995 E300D 306,000 Sold
1996 Ford Taurus LX 130,000 Sold
1985 300TD Still 225,000 Sold
2016 Ford Fusion 24,900

In a gas car at least the EGR cools (cool is a relative term inside an engine) the combustion chamber and tops of the pistons to reduce NOx emissions. On a diesel its intention is also to reduce emissions.

It "adds" nothing to the performance of the car, it cuts down your emissions for the EPA.

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68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500

Nissan GTR - Nissan Skyline GTS25T - Toyota GTFour - Rover Mini - Toyota Land Cruiser HJ60 - Cadillac Eldorado - BMW E30 - BMW 135i

It reduces the performance of the car, and has the unintended consequence when combined with oil fumes from crankcase ventilation of clogging your intake system with carbon.

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'83 300D, 126K miles.

Since you have a 95 E300D, this thread may be of interest: Easy Reversible EGR delete, 95,96,97 Non-Turbos.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 75k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Yea, I've been reading it. I blocked my egr a while ago. I've been trying everything to find out why she's still sluggish. I'm guessing here, but the only available air for the intake comes from the air filter box and the egr orifice. With egr blocked, that air isn't available. I want to add it back, but only fresh air. I'm not crazy about the way the little filter looks.

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2009 E320 Bluetec 117,000
1995 E300D 306,000 Sold
1996 Ford Taurus LX 130,000 Sold
1985 300TD Still 225,000 Sold
2016 Ford Fusion 24,900

Something else is wrong with your car, a good running car you shouldn't be able to tell the difference with or without EGR. It saps like 2-3hp... Maybe. And by disabling the EGR you have not reduced the amount of air going into your engine, so there is no way to restore EGR flow without the exhaust gas if that's what you are asking.


More than likely the first 250k miles or whatever on your car with the EGR has loaded up your intake runners with crud. Removing/disabling the EGR will stop additional buildup but it won't clean out what's already in there.


You may need to pull the intake manifold off and manually clean it and get all the crud out.


Also! Did you lock the intake flap open or remove it? I think if you just unhook the EGR on a 606 the intake flap with stay shut. The flap is designed to create some vacuum to help pull in exhaust gasses at idle since diesels don't product manifold vacuum. But if its staying shut all the time you have a big air restriction at big rpms

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68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500

Nissan GTR - Nissan Skyline GTS25T - Toyota GTFour - Rover Mini - Toyota Land Cruiser HJ60 - Cadillac Eldorado - BMW E30 - BMW 135i

It does not add anything beneficial to the engine in my experience. The only reason they were ever installed is because the EPA has a long arm and mandated it be installed. There is no reason you would want burnt fuel in your intake. It is dirty and has little to no oxygen that is need for combustion. It can have the effect of reducing certain emissions but it also increases others. IE: reduces NoX but increases Co2, etc. It is trading one "evil" for another.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge

i agree that the OP's issue is more or less unrelated to EGR.

dan, thanks for your informed posts. would you care to comment on whether the operator of an OM617, concerned about being a good citizen, might ever install a DPF?

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'77 240D, 504H, OM617.952, etc.

Thanks to all who contributed here. I feel confident that I can eliminate one more possible issue causing my performance issues.

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2009 E320 Bluetec 117,000
1995 E300D 306,000 Sold
1996 Ford Taurus LX 130,000 Sold
1985 300TD Still 225,000 Sold
2016 Ford Fusion 24,900

And that would be?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 75k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Not getting the combination of air from the filter box AND egr valve. My take is that air from air filter box is adequate.

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2009 E320 Bluetec 117,000
1995 E300D 306,000 Sold
1996 Ford Taurus LX 130,000 Sold
1985 300TD Still 225,000 Sold
2016 Ford Fusion 24,900

So this explains why my 78 is such a dog and the engine idles like crap....I don't have an egr.....anyone want to help me install one?

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