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'91 Merc 190E 2.3
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232 Posts
Discussion Starter #1
I own a 1991 Mercedes 190E 2.3 here in Ontario Canada. The vehicle failed the Emission Test on several occasions this year (High NOx only). This has led me to clean the EGR valve, replace the fuel filter, replace the fuel & brake lines, the usage of SeaFoam, oil & filter change, drove on the highway for 1hr. Nothing worked. I finally caved and had the Catalytic Converter replaced.

With the new cat should i still drive on the highway for 30 mins before having it E-Tested or is it ok to drive into Canadian Tires with a relatively cold cat?

Lastly, if my vehicle STILL fails the E-Test with a High NOx what would be the next likeliest problem?
 

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87 300D 5 speed
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5,517 Posts
The first thing you should have replaced was the O2 sensor. A new cat might help mask a failed O2 sensor. O2 sensor is also a lot cheaper.
 

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1992 Mercedes 190E 2.6
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25 Posts
NOx is an indicator of high combustion chamber temperature.

Maybe you are running lean?

PS: I am currently only an automotive student, so my post may or may not be accurate. Im just posting ideas that I learned from the classroom.

EDIT:
Also, is the coolant temp. sensor in good working condition?
 
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