Even if you don't work with cars, you're likely familiar with many common automotive problems. Faulty brakes and failing alternators are easy to understand, and they tend to be issues that crop up on vehicles of any make or model. Variable valve timing may sound significantly more mysterious, but understanding a bit about this system can help you to spot trouble with your car.

What Is Variable Valve Timing (VVT)?

Variable valve timing is a generic term, but you may be more familiar with some manufacturers' proprietary systems. For example, some companies refer to their valve timing system as VTEC, while others use VANOS or Dual VANOS. The implementation details can vary significantly, but the basics typically remain the same between manufacturers.

As the name implies, variable valve timing is about altering your engine's intake and exhaust valve timing characteristics. Different timing characteristics may be more suitable for different situations, such as pushing your vehicle at wide-open throttle or gently cruising down the highway. By varying valve timing, vehicle engineers can maximize performance and efficiency in all conditions.

Why Should You Care?

If cars worked flawlessly at all times, then there wouldn't be any reason to concern yourself with the details of your engine's valve timing. Unfortunately, all mechanical systems can fail, and variable valve timing equipment is no exception. Most cars use a computer-controlled solenoid to engage the variable valve timing systems, and these are a common failure point.

A failing VVT solenoid can produce several symptoms that will impact your vehicle's drivability. A bad solenoid can also lead to additional engine wear over time. If the problem is left unaddressed, this can even result in internal engine damage. For these reasons, it can be extremely beneficial to understand and recognize a failing solenoid's symptoms.

How Will You Know if Your VVT Solenoid is Bad?

Unfortunately, problems with your car's VVT system can produce a wide range of issues. A faulty VVT solenoid will often increase your fuel consumption, decrease available power, and cause rough idling problems. If you are lucky, these faults will trigger a check engine light, allowing you to diagnose the issue more efficiently.

Since narrowing the problem down to the VVT solenoid can be challenging, it's usually a good idea to rely on a professional repair shop to diagnose vague drivability issues. If you notice a sudden change in your car's performance or fuel economy, you should always schedule a check-up as soon as you can. The earlier you address issues such as VVT solenoid failure, the less likely they are to cause severe damage. For more information, contact a car repair service.