May 30, 2024

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Symptoms of a Bad Variable Valve Timing Solenoid [HOW TO FIX!!]

VVT Solenoid - How To Fix - Replace

The majority of modern vehicles feature VVT solenoids to increase performance and fuel efficiency. Engine valve lift timing can be changed thanks to the VVT timing solenoid. By ensuring that the engine receives the proper amount of oil at the appropriate time, fuel efficiency is increased.

By extracting a tiny amount of current from the battery, solenoid valves regulate oil flow by using the electronic principles of electromagnetism. When there is a defective VVT timing solenoid, current flow and connection to the solenoid are halted. This causes issues while trying to start the car.

Symptoms of a Faulty VVT Timing Solenoid

The symptoms of a damaged timing belt are numerous. Among them are:

1. RPM Variations

Inappropriate engine idling is the first symptom of a broken VVT timing solenoid. Typically, this manifests itself as RPM variations. Incorrect VVT timing causes the engine to get more oil flow. As a result, the car revs while idle. Rough handling is typically caused by an engine that is improperly idled. Ignoring the RPM variations may result in the engine developing wear and tear before it should.

2. Check Engine Light

The check engine light in modern vehicles can be used to identify any odd activity thanks to the Electronic Control Unit (ECU). All action that occurs inside the car, including engine activity, is compared and reported by ECU monitors. Anytime a circumstance is discovered to conflict with predetermined values, the check engine light will illuminate.

It is advised that you take your vehicle to a qualified mechanic as soon as you can to have it thoroughly inspected. Decoding the engine light scenario on your own can be challenging.

3. Fuel Efficiency

The timing of when engine valves open and shut, allowing oil to enter the engine, is controlled by the VVT solenoid. Fuel efficiency will decrease due to insufficient oil infusion and a defective VVT timing solenoid. The car would be seen to be using more fuel than usual.

You should watch out for dramatic drops in fuel use. Some people also detect “unburned” fuel, which is a sign that the VVT sensor is malfunctioning. This is only accurate, though, if engine oil continues to be of high quality. The performance of the car might be directly impacted by dirty or subpar engine oil. Additionally, it can cause the Variable Valve Timing solenoid to clog.

A Bad VVT Timing Solenoid Replacement

When you identify and confirm that the VVT solenoid in your automobile is malfunctioning, you should have it replaced as quickly as possible. If you are familiar with cars, you can simply handle the replacement on your own. If not, be sure to go to a dependable, licensed auto technician.

How To Fix?

To quickly and effectively replace a damaged VVT timing solenoid, these steps must be followed.

1. Unplug the battery

Making sure that there is no battery acid spill, you must unplug the car battery by loosening the terminals. Extreme caution must be used when carrying out this step. To avoid any potential short, make sure to keep both terminals apart at all times. The capacitors may occasionally store a little quantity of charge.

2. Open the engine cover

The plastic cover for the engine must next be taken off. Every model’s plastic body is unique. But typically, nuts and bolts are used to secure them. Remove all nuts using the proper ratchet, and store them safely.

3. Track down the VVT Solenoid

To find your way around the engine, get the owner’s manual for the car. The solenoid for the variable valve timing, which is typically located around the valve corner, should be discovered with great care. Additionally, you can look for it by contrasting it with an image or a brand-new VVT solenoid (if you purchased one). Once located, remove any wires and other clutter from the area.

Since the solenoid valves are frequently secured using mounts and bolts, you should also keep an eye out for those. The majority of the time, there is just one bolt, but occasionally there may be two. Be careful not to drop the bolts in the engine room when you remove them. Since they can be difficult to replace, keep them safe.

4. Discard the Previous Solenoid

The connector fixed to the old VVT solenoid must be taken off as the first step in removing it. Make careful that you do not disturb any connections to the connector. To unlock the lock, push the tab on the valve’s side. To completely remove the solenoid, use two channel locks. You might need to pull and grasp the metal component. If pulling directly doesn’t work, try utilizing whirling motions instead.

Never dispose of an outdated VVT timing solenoid without first giving it a thorough inspection. Sometimes the solenoid is not the issue; rather, it is something completely different. Examine it carefully to be sure it is flawed. Additionally, check sure that no extra parts, such as the O-ring, were left in the engine room. Before installing a new one, clean and dry the area with a towel to remove any dust or debris.

5. Fresh Install

Before being repaired, solenoids need to be properly lubricated. Once you unbox it, be careful to grease it. Remember to keep an eye out for seals. Put lithium grease on them to lubricate. Utilizing the mounting screws, place the solenoid and secure it. To tighten the screws, use the proper amount of torque.

Now that the Variable Valve Timing solenoid has been connected, the connectors and jacks need to be installed. You stop corrosion, make sure to oil the connector’s face and seal with dielectric grease. To confirm that everything is in working order, double-check all the bolts and connectors.

Reinstall the engine cover and tighten each screw. You can now reconnect the car’s battery.

6. Bad motor oil

The engine oil must be clear, with reduced lubricity, and free of debris for the VVT to operate as intended. It obstructs the solenoid’s path to the VVT chain when it is dirty and clogged with debris. The VVT solenoid, chain, and gear drive are all harmed by the unclean engine oil if it isn’t changed. By changing the engine oil as directed by the manufacturer, you can prevent this.


Your engine’s VVT timing solenoid is a crucial component that contributes significantly to overall performance. Faster wear and tear and occasionally even the necessity for car body repairs might be brought on by malfunctioning components. I hope the article will help you with how to replace the VVT with a new one.

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Image Credits: Pexels