Second time testing, first time results were a bit higher. Now they are better but still failing. The car was hot during the testing, so i don't think that was the issue. I have used the X3 pin to tune the air/fuel to as close as .5 according to my multimeter. Before my 2nd test, I changed the plugs, cleaned the idle control valve, checked OVP, Air filter is clean, put 91 premium, and so on. Any other suggestions. I have not used injector cleaner or sea foam on the engine yet. Do you guys think that seafoam will help me pass?

ASM EMISSION TEST RESULTS for 190E 11/26/07

15mph
rpm 1853
% CO2 meas. 14.4
% O2 meas. 0.9

HC (PPM)
max 114
ave 31
meas 147

CO (%)
max 0.73
ave 0.10
meas 0.34

NO (PPM)
max 785
ave 237
meas 1240

Results FAIL


25mph
rpm 1430
% CO2 meas. 14.5
% O2 meas. 0.7

HC (PPM)
max 88
ave 20
meas 74

CO (%)
max 0.61
ave 0.09
meas 0.11

NO (PPM)
max 724
ave 199
meas 847

Results FAIL

Also, on my test results, I failed one of the visual inspections.
It says that I failed the MIL/Check Engine Light. None of the error lights on the dash are on so I don't know why I failed this inspection. Wat is MIL? Does anyone know what this inspection is? Thanks.

The MIL means malfunction indicator lamp, in other words the check engine light.
It must come on with the key & go out when the engine is started.

WHAT year car? If the car is a 1990 or later then possibly you have a EGR system that isn't lowering NOx.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

It is a 1990. Oh Ok, maybe someone disconnected the check engine light so that it does not come on at all. I will check that out.

What can I do to remedy the EGR system? Can it be serviced or must I replace the parts? And if so, what would I need to replace?

A lot of failures tend to be due to a bad oxygen sensor; have you checked yours?

__________________

'98 E300 DT
'87 190D 2.5 turbo RIP
'92 S500 Sold
'03 3.2TL-S A-Spec

Duke2.6 has some good info here-
http=://www.peachparts.com/shopforum/showthread.php?p=833484#post833484

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With his low CO and HC readings, I doubt the 02 sensor is an issue here.

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2007 C 230 Sport.

So basically NO and HC problems have to do with the EGR? I want to have an idea of what needs to be fixed.

The EGR system is responsible for NOx reduction.
High HC is usually caused by such things as ignition problems ( misfires ), mechanical problems ( oil consumption ), etc.
Since you're okay on HC, I would focus totally on the EGR system.

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2007 C 230 Sport.

I was under the impression that the EGR was usually only activated during warmup. When the engine is running and warm, I have been told that the EGR remains closed. I suppose that this is erroneous.

__________________
83 W123 240D
76 300D, "Lil Yellow Car"
1978 Cessna 172N 180 HP Mod

"If life ain't fun, I'm not interested"

The important things are those that you learn after you know it all.
Chip Foose

Build a better mousetrap and you will REALLY infuriate corporate america.

Making sure that with the engine running & applying vacuum to the EGR valve that the engine starts shaking & running rough.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

what about going to junk yard cutting one off and running two cats ?

Replacing the Cat makes sense. I had a truck that failed. I replaced the cat at the suggestion of an experienced mechanic and it passed with flying colors. Afterwards, I realized that the EGR was completely disabled, but it passed OK anyway.

__________________
83 W123 240D
76 300D, "Lil Yellow Car"
1978 Cessna 172N 180 HP Mod

"If life ain't fun, I'm not interested"

The important things are those that you learn after you know it all.
Chip Foose

Build a better mousetrap and you will REALLY infuriate corporate america.

I know it's an old thread, but tagging on here and hopefully someone can help. I've also got an issue with smogging a 2.6. Mine's a '92.

The numbers are good for my smog, but it failed due to an EGR issue. Basically, it's not passing gas. The tech took a vac pump to the solenoid and the diaphragm moved, so I don't think that's the problem.

Here's where I am with my troubleshooting (all done idling):

I pulled some hoses to see if I can tell where the holdup is. There is no vacuum at the solenoid, but there is vacuum at the relay just after it. I swapped the electrical connectors to the identical relay that is just next to it, and there was no change. I'm not sure if these should be open during idle, so I'm not sure if this should have changed anything.

Please advise as to what I should be checking next.

Thanks.

Sent from my HTC One_M8 using Tapatalk

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Watch him go!!! link

#dontdealwithkahlil

Because the diaphragm moved doesn't mean that its holding a vacuum. I would just replace the EGR. You said your numbers were good, so I'm assuming you passed as far as emissions, but you failed because the operation of your EGR. So replace it and problem solved.

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1990 190E 3.0L