How to Approach Repair of a Variable Valve Timing Unit Failure in a Volvo

by techplusaadmin June 28, 2023

Variable Valve Timing (VVT) is an advanced technology used in modern engines that optimizes fuel efficiency and engine performance. Volvo cars also use this technology, and a failure of the variable valve timing unit can lead to serious engine problems.

The VVT system relies on oil pressure and precise electronic control to adjust the timing of the engine’s valves, which can be affected by various factors such as oil issues or electrical problems. Volvo owners can take preventative measures to ensure the longevity and reliability of their vehicle’s engine if they know the causes and signs of failure in this car component.

Below are the most common causes we see of a variable valve timing unit failure in volvos that come to our shop.

Lack of Maintenance

The VVT unit in your Volvo engine requires proper lubrication to function correctly. Over time, oil and other contaminants can build up and clog the VVT system, causing it to fail. Regular engine oil changes are crucial in preventing VVT unit failure as they help ensure that fresh oil is circulated through the engine and the VVT system, preventing build-up and clogs.

Oil Issues

VVT units rely on engine oil pressure to operate correctly. Low oil levels, dirty or contaminated oil, or a clogged oil filter can all cause the VVT unit to fail. Regular oil checks and changes can help avoid these issues. If your Volvo has a history of low oil pressure issues, it may be time to have your oil pump inspected or replaced.

Electrical Problems

The VVT system in your Volvo relies on an electronic solenoid to control the flow of oil to the variable valve timing mechanism. Electrical issues such as a damaged or corroded wiring harness, blown fuse, or faulty solenoid can cause the VVT unit to fail. Regular vehicle inspections and maintenance can help prevent electrical problems.

Timing Chain or Belt Problems

The VVT unit in your Volvo is controlled by a timing chain or belt. If these components become worn or damaged, they can cause the VVT unit to fail. This can occur due to a lack of maintenance or driving conditions such as high mileage, harsh driving, or extreme temperatures. It is crucial to have your timing chain or belt inspected and replaced at the recommended intervals to avoid VVT unit failure.

Watch for These Indications of a VVT Unit Failure

• Engine Misfire: When the VVT unit fails, it can cause the engine to misfire. This occurs when the engine’s timing is off, causing the engine to run poorly and produce a rough idle or loss of power.
• Engine Warning Light: A VVT unit failure can cause the check engine light to illuminate on the dashboard. This warning light can indicate various problems with the engine, including VVT unit failure.
• Engine Noise: A VVT unit failure can cause strange noises to emanate from the engine, including a ticking or tapping sound. This noise is caused by the VVT unit not functioning correctly and can be accompanied by decreased engine performance.
• Poor Fuel Efficiency: When the VVT unit fails, it can cause the engine to consume more fuel than usual, leading to decreased fuel efficiency. This is because the engine is not running as efficiently as it should be.

Diagnosing VVT Unit Failure

To diagnose a VVT unit failure, our mechanics may use diagnostic equipment to read fault codes stored in the engine control module (ECM) and perform visual inspections of the VVT unit and related components. Depending on the severity of the failure, the VVT unit may need to be replaced, and other components, such as the timing chain, tensioner, and guides, may need to be inspected and replaced if necessary.

Get Help From Experts At Tech Plus Automotive

If you suspect that your Volvo has a variable valve timing unit failure, then you should bring it to our repair shop, specializing in Volvo vehicles. Tech Plus Automotive is your go-to auto Volvo garage in the area!

When you bring your Volvo to Tech Plus Automotive, our mechanics will properly diagnose and repair the issue to get your car or SUV running in top condition again. We are happy to help car owners from Phoenix, Paradise Valley, McCormick Ranch, and Scottsdale, AZ and the surrounding areas. Book an appointment now to enjoy our quality service!