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1914 Mercedes 28/95 hp, 83' 300SD, 93' S420, (three) 94' S420's, 95' S500 & 96' S600
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Discussion Starter · #1 · (Edited)
Further information that may assist...... many of these topics are overlooked and misunderstood. All are important in their own right and need due consideration and attention!

The emission control system reduces tailpipe emissions, hydrocarbons produced by evaporating fuel, and combustion gases that escape through the crankcase into the atmosphere. Effective control of vehicle emissions is necessary to reduce the automobile's impact on environmental pollution. These are the systems/components used to control emission output:

Air Injection

(Secondary Air Injection Systems.... ie: Infamous P0410 error code)​
The air injection reactor system assists the catalytic converter operation by adding air to the already burning exhaust gases, oxidizing CO and HC's, and creating additional heat which accelerates the catalytic converter operation.

Catalytic Converter
The catalytic converter effectively changes harmful pollutants into carbon dioxide and water.

Evaporative Control System​
The emissions created by the evaporation of raw fuel is controlled by the use of a closed ventilation system for the fuel tank, and a canister filled with activated charcoal to capture the fuel vapors. The charcoal canister captures and stores the vapors as they expand. When the engine is started, a valve is opened allowing the engine to draw air through the charcoal canister thereby also drawing in and burning the stored fuel vapors.

Exhaust Gas Recirculation
The EGR system recirculates exhaust gases back into the intake system. The introduction of these gases lowers the temperature of the combustion chambers which reduces oxides of nitrogen.

Fill Pipe Restrictor​
To prevent the introduction of leaded fuel to the system, a fillpipe restrictor is installed. This prevents the larger diameter fuel nozzles used for leaded fuels from entering the fillpipe. Leaded fuel will permanently contaminate the oxygen sensor, and the catalytic converter.

Positive Crankcase Ventilation​
The PCV system prevents blowby (emissions produced by the engine combustion chambers which escape into the crankcase) from entering the atmosphere. By recirculating the gases back into the intake system, blowby gases are burnt along with the incoming air/fuel mixture.

Regards, Robert O. (filling in for Dutch... Hibbo Ohlings)


93 SL500, 95 SL320, 96 S320, 98 S500, 2002 E320 4Matic Wagon & A little 91 5.0 FORD Mustang
8,701 Posts
Thank very much Robert for sharing the information.

Martin Vargas
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