If EGR is deleted on a 602 and a 606, might the cars in question fail an opacity test at a state inspection? My guess is no, that whether or not EGR is working or not wouldn't give differing results in an opacity test....that a 60x engine burns clean enough to pass any state's opacity tests.

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

The EGR makes the engine run dirtier, not cleaner with regards to opacity. If you can't pass an opacity test for those model year vehicles, you have a serious emission problem.

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'83 300D, 126K miles.

Yes, but the exhaust that would have otherwise gone out the tailpipe goes back into the intake when the EGR is functioning. So if the EGR is NOT functioning, there's more stuff in the exhaust. Or am I missing something?

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

You're missing something. EGR is there to lower combustion temp and thereby lower NoX emissions. The small amount of PM (particulate matter, often called "soot" on here) reintroduced to the combustion chamber is primarily carbon and therefore will burn. Shouldn't be an issue at all.

However, if your state measures NoX at the tailpipe (some do) that value will increase. Will it be too much to pass - you'll have to try it to see. And remember that it takes a lot to properly bypass EGR - manufacturers change cam specs, piston design, combustion chamber shape, and who know what else to build an emissions "system" - one component does not an emissions system make. And you're not likely to see much actual improvement from the EGR delete. People are really good at convincing themselves that some change made their car faster, give better fuel economy, etc. but actual lab-based back-to-back testing usually shows little or no change. In fact, scientific testing usually shows a negative effect on the very parameters the modifier was trying to improve.

Dan

No, state only measures opacity....so I'm sure I'll be fine.

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Hmmmm....almost warrants a different thread. First time I've read someone suggest that an EGR delete could be detrimental.

On my 602s, the EGR delete was a consequence of doing the wastegate mod. Very glad to have all the vacuum rat's nest removed from the passenger side of the engine. On my 606, I haven't deleted EGR yet but had planned to do so in conjunction with a chip tuning.

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

can't speak to OM602s or other MBs but I've deleted EGRs on both my Detroit 6.5Ls and performance&mileage both went up. went from 17MPG to 21MPG consistently. I run B20 in one and B100 in the other. I've already disabled the EGR and Throttle cans on my 93 300D. it would take a lot of cites to convince me that recircing soot and whatever else BACK thru my engine is a good thing for anybody.

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1993 MB 300D 245K died.

As long as it keeps soot out of the intake manifold, its worth it. Deleting EGR on an OM606 can be tricky depending on the model year.

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CENSORED due to not family friendly words

It'll be done as part of the chipping of the ECU.

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

I delete EGRs on my diesels for cleaner intake manifolds.

On the OM601 the Euro 2.0 with no EGR and the use 2.2 with EGR are rated at the same power. I could see there being a slight improvement. With it deleted on all of my Mercedes diesels except my 602T in my 92 (once the electrical system is finally sorted out a wastegate swap is in order), I have noticed cleaner intake manifolds. Maybe a tiny bit more power on my 602 and 601 NA motors. Haven't noticed a measurable difference in mpg, nor a measurable difference in power. If your intake is plugged up with soot you will notice a loss of power and mileage, but its not the egr running that's directly causing that, its an externality of the way it works.

I guess the net effect of what I am saying is, if you unplug your EGR, don't expect to outrun E55s on the highway, and pass prius' at the gas pump simply because you got rid of your EGR.

I get rid of it on my cars and have noticed no downsides, but its also not like the holy grail of modifications, its probably not going to change your life.

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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

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