[W126 Coupe] Emissions question

[Dick Spellman]

Hi Rich:

When was the O2 sensor last replaced?  Assuming the O2 has <100K miles, 
check the lambda and make a note of the value then lean the lambda down 
till she just runs  poorly and add a can of Emissions Pass followed by a 
30 minute 'easy' highway run just before going to the test center.  
Leave engine running the entire time from highway run to emissions test 
and see if she passes.  Assuming you pass, rich up the lambda until you 
are back to the original values for best performance.

More than 100K on the O2, time to replace it.  DO the Mustang O2 sensor 
(see archives)  for $37 and you should be good to go.

No rattle on the cats?  If you can move the exhaust so as to hear the 
cats rattle then you may have fouled out the cats (typically from too 
much oil hitting them over time) where the heat is trapped and they turn 
more solid then porous leaving you with a rattle and poor cleaning of 
the exhaust gasses.   Poor cats will usually result in an exhaust 
restriction giving your poor running which you are not having!  So, I'd 
probably lean her up as mentioned and then restore best performance when 
emissions are passed.

Also check  to see at what point your state has any cut-off on emissions 
values due to vehicle age.  That's how I get a pass on my 83.

Dick

richard jaffe wrote:

> 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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