Symptoms of a Bad or Failing Variable Valve Timing (VVT) Solenoid

In the early to mid-1960's, American automotive giants Chrysler, Ford, and General Motors ruled the streets and drag strips across the land. With every new car produced, the "Big Three" learned more about engine performance and how to squeeze every ounce of horsepower out of their engines by manually adjusting valve lash and ignition timing. One of the biggest breakthroughs was the development of variable valve timing (VVT), a new system that utilized advanced (for the time) electronic technology to apply variable electronic signals from the ignition system by way of a variable valve timing solenoid. Today, a VVT system can be found in virtually all production vehicles sold throughout the United States.

Each automotive manufacturer has their own unique VVT system, but most of them rely on a fully functional variable valve timing solenoid to control the flow of oil to the VVT system as it is engaged. This system typically activates when there is a significant load against the engine. Some examples of this include while a vehicle is carrying additional weight, traveling up hills, or when acceleration is expedited through throttle control. When the VVT solenoid activates, oil is sent to lubricate the variable valve timing chain and gear assembly. If the VVT solenoid fails or is blocked, the lack of proper lubrication can cause the timing chain and gear to prematurely wear or break entirely.

There are several other problems that may occur when a VVT solenoid is wearing out or has broken that may extend to complete engine failure. In order to reduce the potential of these serious situations occurring, listed below are a few warning signs to be aware of that might indicate a problem with the VVT solenoid. Here are a few symptoms of a worn out or broken VVT solenoid.

1. Check Engine Light comes on

Since today's modern cars are controlled by an Engine Control Unit (ECU), virtually all individual components are monitored by the ECU. When one part is beginning to fail, the ECU will store a specific trouble code that will let a mechanic using a scan tool know that a problem exists. Once the code has been generated, it will signal the driver by illuminating a specific zone warning. The most common light to illuminate when a VVT solenoid is failing is the Check Engine Light.

Due to the fact that every automotive manufacturer has different codes they utilize, it's critical for a car owner to contact a local ASE Certified mechanic to inspect the car, download the code through the correct diagnostic tool and determine the precise source of the problem. In fact, there are literally dozens of individual codes for VVT solenoid issues for every automotive manufacturer. Once the mechanic has this initial information, they can begin to resolve the specific issue.

2. Engine oil is dirty

This is more of a cause as opposed to a symptom. The VVT solenoid works best when the engine oil is clean, free of debris, or has lost some of its lubricity or viscosity. When the engine oil becomes clogged with debris, dirt or other foreign particles, it tends to clog up the passageway from the solenoid to the VVT chain and gear. If your engine oil has not been changed out on schedule, it could damage the VVT solenoid, the VVT chain, and the gear drive.

To avoid this situation, make sure to have your engine oil changed as recommended by the vehicle manufacture. Low oil levels can also cause problems with the VVT solenoid and other timing system components.

3. Rough engine idle

Typically the VVT system does not activate until the engine is at higher RPM or is introduced to load bearing situations like driving uphill. However, if the VVT solenoid is malfunctioning, it is possible that it will introduce additional engine oil to the VVT gears. This can cause the engine to idle rough, specifically the engine RPM to fluctuate as the system is activated. If not checked quickly, it can cause additional engine components to wear prematurely. If your engine idle is rough, make sure to have a certified mechanic inspect this as soon as possible.

4. Decrease in fuel economy

The purpose of variable valve timing is to ensure that the valves open and close at the right time to maximize engine performance and reduce fuel consumption. When the VVT solenoid is malfunctioning, the entire system can be compromised, which may result in intake and exhaust valves opening and closing at the wrong time. This typically causes the fuel economy to drastically reduce.

If you recognize any of the above warning signs of a bad or failing variable valve timing solenoid, contact a local ASE certified mechanic from YourMechanic. They can inspect your vehicle, replace the variable valve timing solenoid if needed, and keep your car or truck running strong.


Next Step

Schedule Vehicle Engine Mechanical Inspection

The most popular service booked by readers of this article is Vehicle Engine Mechanical Inspection. Once the problem has been diagnosed, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. YourMechanic’s technicians bring the dealership to you by performing this job at your home or office 7-days a week between 7AM-9PM. We currently cover over 2,000 cities and have 100k+ 5-star reviews... LEARN MORE

SEE PRICING & SCHEDULING

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Recent Vehicle Engine Mechanical Inspection reviews

Excellent Rating

(4)

Rating Summary
4
0
0
0
0
4
0
0
0
0

Jeremy

21 years of experience
802 reviews
Jeremy
21 years of experience
Kia Soul L4-1.6L - Vehicle Engine Mechanical - West Palm Beach, Florida
Highly experienced Able to provide every relevant answer for the case. Highly recommended Thank you Jeremy
Ram 1500 - Starter - Lake Worth, Florida
I don't let others work on my vehicle, but was unable to replace my starter due to a back injury. Jeremy showed up early, had all necessary tools and equipment, completed the job in a timely manner, and left the work area clean. Excellent mechanic and will call him again if needed before my back heals.

Ronald

42 years of experience
519 reviews
Ronald
42 years of experience
Ford Mustang V8-5.0L - Vehicle Engine Mechanical Inspection - Houston, Texas
Great personality and very friendly and helpful.

Raymond

38 years of experience
613 reviews
Raymond
38 years of experience
Cadillac Brougham V8-5.7L - Vehicle Engine Mechanical - Las Vegas, Nevada
Talent and passion for what you do in any field is critical, Raymond seems to have both. I have dealt with many Mechanics in my day Raymond is one of the best. Thank you sir.

Rusty

24 years of experience
567 reviews
Rusty
24 years of experience
GMC Sonoma L4-2.2L - Vehicle Engine Mechanical Inspection - Arlington, Texas
Great overall impressions. Vechile is driveable and runs terrific now.

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

Related articles

How Long Does an Oil Pump Cover Gasket Last?
In In order for the oil in your car to get to where it needs to go, it will need the right amount of pressure. There are a number of different systems and parts on a car that help to...
How Long Does a Variable Valve Timing (VVT) Solenoid Last?
One One of the biggest concerns that most people have about their car is how it runs and idles. Most car owners fail to realize just how many different components have to work together in order for this type of...
How to Replace an Exhaust Gas Recirculation (EGR) Control Solenoid
Exhaust gas recirculation (EGR) systems are controlled by the EGR control solenoid, which is controlled by the powertrain control module (PCM).

Related questions

Check engine light flashing, sucking fuel, procrastinating when accelerating...
This is a very odd set of symptoms. I would suggest ruling out any fuel-related issues as the poor fuel economy and lack of power could be related to faulty sensors like the throttle body sensor, mass air flow sensor,...
Timing chain positioning
This system is a bit complex. I can give you some instructions, but I highly recommend getting a hold of a repair manual or purchasing a yearly subscription for just your vehicle from AllData. It is only $25 for a...
2010 VW Routan. current meilage is 56500 the freeway MPG is 24 which is good howver the local mpg now drop from 17 to 11. Why?
Gas mileage can be affected by vehicle condition, tire pressure, or even driving style. If you have been sharing the use of the car in the past year, it could be that your partner has a heavier foot than you...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com