Every manufactured vehicle, whether luxury or teen-affordable, truck or convertible, brand new or used, is susceptible to component failure. The Porsche is not on an exclusion list. A common issue that plagues the Porsche 911 is the faulty Change Over Valves (COV) solenoid. However, it is worthy of note that each generation of the Porsche 911 has its unique issues which we will analyze.
Porsche owners should be well-informed of these issues so they can take preventive measures to avoid any form of catastrophe.
Some Common Porsche 911 Issues
When analyzing Porsche sports car issues, a good approach would be to categorize the issues according to generation. Every generation has its unique issue, and we will let you know the generation that is known to have the faulty COV solenoid. It should, however, be noted that every vehicle has its issues, and when these issues occur, you are advised to visit our Porsche expert repair shop right away.
The First Generation Porsche (1963 – 1989)
This generation comprises Porsche vehicles that come with air-cooled engines. As is the norm with vehicles, age usually takes its toll on vehicles. The Porsche is affected by this factor. As such, there is an array of worn-out components associated with this generation. Rust issues are also common with this generation, as their chassis are not galvanized, thus, becoming susceptible to corrosion. They also have extensive engine issues.
The Second Generation Porsche (1990–1994)
This generation comes with Porsche models whose brakes have been updated and with high-level tech, like the popular Automatic Brake System (ABS). This model was called 964, and it was well known to be reliable. Common issues of this generation include failed dual-mass flywheels, worn suspension bushings, worn distributor belts, and oil leaks.
The Third Generation Porsche (1995-1998)
No doubt, this generation was an improvement from previous generations. The vehicle was referred to as the 933, and many vehicle users loved the model. It was the last 911 model with an air-cooled engine. This generation also had its problems, such as secondary air injection faults, transmission problems, suspension issues, and valve guide wear.
The Fourth Generation Porsche (1999-2004)
This generation came equipped with a liquid-cooling engine. The fourth-generation Porsche 911 was called 996. This generation saw competitiveness in design with other sports car manufacturers. This generation equally had issues, like a weak InterMediate Shaft (IMS) bearing. When this bearing fails in vehicles, it causes expensive engine damage.
The Fifth Generation Porsche (2005-2011)
As usual, there is always an improvement on models from generation to generation. However, this generation equally had issues, which include coolant leaks, scored cylinder walls, oil leaks, and cracked coil packs.
The Sixth Generation Porsche (2012-2019)
This generation came equipped with the latest in high-speed technology. The model is referred to as Porsche 991. Due to the new nature of the model, the problems are still somewhat minimal, but it is worthy of note that users have made several complaints with the vacuum lines. However, users have also complained about faulty Change Over Valve (COV) solenoids.
The Change Over Valve (COV) Solenoid
A solenoid is an electro-hydraulic switch that helps to control the valves located in the valve body. The Porsche 991 car has multiple COV solenoids, and each of these solenoids is used to route the vacuum to different parts of the vehicle.
Also, the S-cars and Porsche Sports Exhaust (PSE) models rely on the COVs to open and close the exhaust valve.
The 991 comes with about 7 to 10 COVs, some of which are:
- air cleaner flap
- acoustic simulator
- heater shut-off valve
- exhaust flaps
- coolant shut-off valve on the engine bypass circuit
- tuning flap
The most common complaint of a faulty COV solenoid is usually the heater shut-off valve and the exhaust flaps. When the COV solenoid starts developing faults, it’s advised to visit our Porsche specialty service center.
Bavarian Auto for Porsche Repairs
Frequent car checks can help prevent COV solenoid faults. Should the fault occur, Bavarian Auto can give you peace of mind with our quality repairs by our licensed and experienced Porsche professionals. We are the service center for all Porsche owners in Ooltewah, Hixson, and the surrounding areas in Chattanooga, TN. Contact us today and book an appointment with our experts to get your Porsche back on the road in top condition!
* Porsche 911 Carrera S Car image credit goes to: Roman Stasiuk.