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Car Forum / Mercedes-Benz Cars / May 2008

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300E Smog Emissions Test Results

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Tube Audio - 13 May 2008 21:19 GMT
Hi

I have a 1987 300E live in California, however the car is from the east
coast, so it is a 49 state car.

I am up for my smog / emissions test in a couple of months.

The NO have been high the last two tests.  And am afraid that they might be
even higher and fail the upcoming tests.

Here are the results of the last two tests.  Any ideas of areas that I
should look into would be a great help.

Thanks

2004 Test
15mph 2602 rpm
%CO2        15.0

%O2            0.1

HC MaX     110
HC AVE        31
HC MEAS      62

CO MAX            0.71
CO AVE                0.10
CO MEAS            0.24

NO MAX             772
NO AVE                 237
NO MEAS            768

25mph 1726 rpm
%CO2        15.0

%O2            0.1

HC MaX     85
HC AVE        20
HC MEAS      35

CO MAX            0.59
CO AVE                0.09
CO MEAS            0.12

NO MAX             711
NO AVE                 199
NO MEAS            303

%%%%%%%%%%%%%%%%%%%%%%

2006 Test
15mph 1735 rpm
%CO2        14.4

%O2            0.9

HC MaX     110
HC AVE        31
HC MEAS      104

CO MAX            0.71
CO AVE                0.10
CO MEAS            0.20

NO MAX             772
NO AVE                 237
NO MEAS            765

25mph 1729 rpm
%CO2        14.4

%O2            0.4

HC MaX     85
HC AVE        20
HC MEAS      63

CO MAX            0.59
CO AVE                0.09
CO MEAS            0.16

NO MAX             711
NO AVE                 199
NO MEAS            356
Tiger - 14 May 2008 00:31 GMT
Make sure you change oil before the emission test.

Add dry gas to fuel tank to lower the emission.

You probably can lean out the fuel mixture a bit more, but not much before
your engine idles rough.

If all above failed, then you need new cat converter.
Jens - 17 May 2008 21:11 GMT
> Make sure you change oil before the emission test.
>
[quoted text clipped - 4 lines]
>
> If all above failed, then you need new cat converter.

Right, the catalytic converter is supposed to reduce NO contents. High
NO contents is then due to ineffective catalytic converter.

As said, you can cheat at little by leaning the mixture, but that
would lead to a higher HC contents. But still you may just pass one
more time.

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