Mercedes-Benz SLC EGR valve replacement

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Mercedes-Benz SLC EGR valve replacement

When do Mercedes-Benz SLC EGR valves need to be replaced?

The exhaust gas recirculation (EGR) valve recirculates a portion of the exhaust gas that would normally go through your Mercedes-Benz SLC's exhaust system and mixes it in with the fresh air inside the intake manifold. These gases are then burned off as they pass back through the combustion process.

Reducing the volume of emissions going through an exhaust system lengthens the life of a catalytic converter and helps the environment, and most modern vehicles have either an external or internal EGR valve.

The EGR valve is a vacuum or electric-controlled unit that is bolted onto the engine. Exhaust gases travel through pipes entering one port of the EGR and then exit out another port into the intake manifold.

On an internal EGR, various methods are utilised to recirculate the exhaust gases to be part of the combustion process. 

An EGR valve can fail when it loses vacuum, the diaphragm is perforated, it is full of gunk, or the valve gets stuck open. When this happens the EGR valve will need to be replaced. With electric EGR valves, the problem could be an issue with the wiring.

Symptoms of a faulty EGR:

  • Scan tool shows EGR error code
  • Service engine light on
  • Engine misfire
  • Engine vibration

When your Mercedes-Benz SLC EGR valve fails, the check engine warning light will usually illuminate on the dash and the vehicle may run rough. The engine may run lean or rich, depending on why the valve has failed.

If left for too long a faulty EGR valve can lead to permanent engine damage. Best to get it replaced as soon as possible to avoid further complications and expenses.

You may want to consider periodic carbon cleaning of the EGR valve. If cleaning is not an option, it will need to be replaced.

If your looking for a top mechanic to replace your Mercedes-Benz SLC EGR valve book the best through AutoGuru.


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