[W126 Coupe] Emissions question

[Robert Karl Stonjek]

Hi,
just for the record, the results for my 560SEC Euro '87 were:

ppm vol HC   168
% vol CO       2.100
% vol CO2    12.44
% vol O2        0.39


The Euro version has no cats, O2 sensor etc and I subsequently found that the fuel injection computer was faulty.  I have not had it retested since the CIS-E was repaired.

If CO can be trivially added to CO2 then mine at 14.54 is lower than yours at 15.5.  This would seem to indicate that your cat isn't doing much.

Note that if you started out with a Euro model without cats and added them, that you may have to change the CIS-E as well as the Euro version may ignore the O2 sensor.  The Boshe part numbers are different for the two versions.

There's no legal minimum in my neck of the woods...

Robert





Hello All:

The following are the test results of the emissions test performed this afternoon on my 85 Euro 500 SEC:

               25/25 test                                                                  50/25 test

                      reading             allowed         result                 reading        allowed        result
HC ppm             212                 137              Fail                    216             140             Fail
CO %               1.86                 0.87             Fail                   1.85             0.79           Fail
NOx ppm          1028                 956              Fail                   1036            1046           Pass
RPM                1302                 2500 max                              1357            2500 max
CO+CO2 %       15.5                  6.0 min                                 15.5             6.0 min

The following items are new: 8 fuel injectors w/ air tubes, Beru spark plugs, Beru ignition wires, Distributor cap and rotor button, ICM and various vacuum hoses and vacuum connector, 1 can BG 44 intake system cleaner.

The car now runs great. Just can't seem to satisfy the clean air nazis in this state. Is the mixture too rich?
Any ideas how to rectify this situation? Oh yeah, the car does have catalytic converters.

Rich Jaffe
85 Euro 500 SEC 259K
83 300 SD         192K


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