Your Mercedes-Benz Sprinter's exhaust gas recirculation valve (EGR) is an integral part of your exhaust gas system. It is responsible for reducing NOx emissions by recirculating exhaust gasses back into your vehicle's intake manifold. Think of it as a manager of exhaust gas flow. It is located in your vehicle's engine compartment and is controlled by your engine control module (ECM), which uses sensors to monitor the EGRs output while driving.
From time to time, your Mercedes-Benz Sprinter's EGR valve could malfunction due to clogging or all-out malfunction due to heavy wear and tear. Specifically, excessive carbon deposits, debris, dirt, and soot could accumulate in your EGR valve, causing it to remain stuck. This is especially true with urban driving.
One of the most prominent signs of a defective EGR valve is a loose diaphragm, which moves within the casing if shaken. A rough idle and decreased fuel economy are other telling signs.
Sprinter EGR valve stuck? Keep reading below to understand Sprinter EGR valve symptoms, your Sprinter EGR valve location, how to test EGR valve, and how to troubleshoot, diagnose, and repair.
What Are Some Common Problems With Your Mercedes-Benz Sprinter's EGR valve?
Let's focus on common issues and solutions for your Mercedes-Benz Sprinter's EGR valve.
Sudden Loss of Power
Defective Mercedes-Benz Sprinter EGR valves usually result in a sudden loss of power with a sudden stalling or shaky feeling. If you notice excessive rough idle and increased fuel economy, this could also be a cause.
Knocking Sounds From Engine
If your Mercedes-Benz Sprinter EGR valve is closed all of the time, it could cause excessive engine noise due to premature igniting of fuel at a higher temperature at lower RPMs.
Check Engine Light Turns On
Your Mercedes-Benz Sprinter's check engine light may signal a defective EGR valve. However, this is not a foolproof method, as it may turn on for other reasons. There are hundreds of trouble codes that are associated with your vehicle's diagnostics system. To be sure of the problem, purchase an OBD scanner, and run a diagnostic test.
In general, you should check your Mercedes-Benz Sprinter's EGR valves every 50,000 miles to ensure proper operation.
How Do I Test My Mercedes-Benz Sprinter's EGR Valve?
Testing an EGR valve is a straightforward process. Simply locate your EGR valve, disconnect the valve's vacuum hose, connect a hand vacuum pump to the valve, and apply a small amount of vacuum pressure to test for diaphragm movement. If the valve doesn't hold your vacuum, it may be time for a replacement.
How Do I Go About Fixing Mercedes-Benz Sprinter EGR Valve Problems?
For Mercedes-Benz Sprinter EGR valve issues, there are several steps you can take to troubleshoot and repair on your own. One of these steps is to carbon clean your EGR valve to get rid of all the carbon and grime that has accumulated over time.
You will need a pair of eye goggles, carb cleaner, and a pair of work gloves for this process.
- Locate your Mercedes-Benz Sprinter's EGR valve.
- Remove the rubber vacuum line and conduct a visual inspection. If there are any signs of damage or heavy wear and tear, you will need to replace it.
- Disconnect your EGR valve's electrical harness and EGR valve assembly from the engine by loosening all nuts and bolts. On occasion, it may feel 'stuck' or difficult to remove. In this case, tap it several times with a rubber mallet to loosen it.
- Remove the gasket.
- Once you remove the EGR valve, soak it in carb cleaner, preferably outdoors, as it carries an overpowering smell. For best results, clean all surfaces using a small brush to really dig into the soot and grime. Keep it soaked in carb cleaner overnight. Be careful not to submerge any electrical connections, or else you will have to replace the entire assembly.
- Reinstall your EGR valve and connect the vacuum hose back as well as all electrical connections.