Mercedes-Benz is a well-known luxury car brand that is known for its style, performance, and durability. However, some Mercedes-Benz models have a common issue with plastic guide rails, which can lead to engine damage if not addressed promptly.
The plastic guide rails used in some Mercedes-Benz models are prone to wear and tear over time. The plastic material can become brittle and prone to cracking, which can lead to the failure of the guide rails. Additionally, exposure to high temperatures, high mileage, and heavy use can exacerbate the problem. The guide rail failure is more common in models built between 1998 and 2010, such as the E-Class, C-Class, S-Class, and CLK-Class.
The plastic guide rails are a critical part of the engine’s timing system, which is responsible for regulating the opening and closing of the engine’s valves. If the plastic guide rails fail, it can cause the timing chain to slip or jump, leading to engine damage.
Symptoms of Mercedes Plastic Guide Rail Failure
The symptoms of plastic guide rail failure in Mercedes-Benz vehicles can vary depending on the extent of the damage. However, the following are some common symptoms that you may notice:
- Unusual engine noise: The most common symptom of plastic guide rail failure is a rattling or clicking sound that gets louder when the engine is running. The noise is caused by the timing chain coming into contact with the damaged guide rails. The noise is usually most noticeable at idle or low engine speeds.
- Reduced engine performance: Plastic guide rail failure can also lead to reduced engine performance. This may include reduced power or acceleration, rough idling, or stalling. The reduced performance is caused by the timing chain slipping or jumping out of place.
- Check engine light turning on: If the check engine light is on, there are many reasons why it can happen. It may indicate a problem with the camshaft or crankshaft position sensor. These sensors are responsible for detecting the position of the engine’s components and sending the information to the engine control module. If the sensors detect an issue with the timing chain or guide rails, it can trigger the check engine light.
- Engine misfire: In severe cases, plastic guide rail failure can cause the engine to misfire or not start at all. The misfire is caused by the timing chain being out of sync with the engine’s valves, leading to improper combustion.
Fixing Mercedes Plastic Guide Rail Failure
If you notice any of the above symptoms in your Mercedes-Benz, it’s essential to bring it to our qualified mechanic as soon as possible. Our mechanic will perform a diagnostic test to confirm the guide rail failure and determine the extent of the damage. Typically, fixing the problem requires replacing the damaged plastic guide rail with a new one. The mechanic may also need to replace other engine components, such as the timing chain, tensioner, or sprocket, if they are damaged. The cost of repairs can vary depending on the extent of the damage.
Preventing Mercedes Plastic Guide Rail Failure
To prevent plastic guide rail failure in your Mercedes-Benz, it’s essential to perform regular maintenance on your vehicle. Regular maintenance can help detect issues early and prevent them from becoming major problems. It’s also important to replace the plastic guide rails with high-quality aftermarket or OEM parts that are designed to last longer and withstand higher temperatures.
Get Help from the Professional Mechanics at Vaughan Automotive
Mercedes plastic guide rail failure is a common 
issue that affects some Mercedes-Benz models. The failure is caused by the age and mileage of the vehicle and can lead to engine damage if not addressed promptly. To fix the problem, it’s essential to take your vehicle to a qualified mechanic who can replace the damaged guide rails and other engine components if necessary.
At Vaughan Automotive, we have certified, trusted technicians who can take care of any issues with your Mercedes. We are conveniently located in Atlanta, GA, and we serve drivers from Buckhead, Mableton, Marietta, Sandy Springs, Smyrna, and Vikings, GA. Call us now to set an appointment or to speak with our mechanics.