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What is Variable Timing Solenoid
In older conventional engines, the time for which the valves remained open was optimised only for single engine speed. However, as the engine speed increases, it considerably reduces the time required to fill the cylinders fully.As a result, the engine would receive less amount of charge (air-fuel mixture) which causes power-loss especially when the engine runs at high speed.
To overcome this deficiency, the engineers developed VVT or ‘Variable Valve Timing’ mechanism. The VVT varies the timing of opening and closing of valves for multiple engine speeds. At high speed, the Inlet valves open quite earlier so that more air-fuel mixture or ‘charge’ enters the cylinders. This helps to increase engine’s breathing which also improves its ‘volumetric efficiency’ to a large extent.
Symptoms of a Bad or Failing Variable Valve Timing Solenoid
Check Engine Light On
This is the thing about modern cars that the ECU or engine control unit starts to warn you as soon as it finds some problem in the engine. It can, in fact, practically monitor all the individual parts of the car. So, in case of an impending variable valve timing solenoid failure, it is due to war you with check engine light.
Dirty Engine Oil
This is one of the variable valve timing solenoid symptoms that are also the cause. The VVT solenoid system performs the best with clean engine oil. When the oil has a lot of impurities, it loses viscosity. This can also cause clogging in the variable valve timing solenoid system, thus also clogging the chain and the gear.
If you see dirty engine oil, chances are that the VVT solenoid system is going out of order.
Roughness in Idling Engine
The passing of additional oil to the VVT gears is a possibility if the system is not working properly. This very phenomenon manifests itself in the rough idling of the engine. It is primarily because the engine’s RPM fluctuates as the VVT starts working. When this symptom is ignored, it can cause premature wearing out of the engine.
Decline in Fuel Efficiency
The function of the VVT is to control the open and shut timing of the valves so as to maximize fuel economy. Any malfunction here can cause wastage of fuel or dip in performance. If you notice decreased fuel economy, chances are that the variable valve timing sensor or some other part of the VVT system is failing.
How to replace the Variable Valve Timing Solenoid
1.Opening the Hood and Engine Cover and Disconnecting the Battery
Disconnect the battery carefully by loosening both the terminals. Now simply twist and pull to remove. Make sure that you keep the cables aside by preferably trying them down with a bungee cord. This assures that they don’t come in contact with each other.
2.Locating the VVT Solenoid， disconnecting and Removing the Solenoid
In order to do so, simply remove the connector that you see on the solenoid. Pull gently on the connector so that the wire isn’t pulled. Most of them open by pressing the tab to release the lock.
Once removed, take a good look and ensure the entire thing is out. Sometimes the o-ring screen or any small part of the valve may be left behind. Check the solenoid mounting surface for the same. Also remove any kind of debris that you find with a long pick or needle nose pliers.
3.Preparing and Inserting the New Solenoid
Lubricate the new solenoid. Also lube up the seals on the solenoid spool (the part where you insert the solenoid) with lithium grease.
Now, insert the fresh variable valve timing solenoid into the mounting surface hole. If you feel a little resistance, don’t force. Try twisting while pushing. It works.
4.Securing the VVT Solenoid and Install the Connector
Take dielectric grease and apply some on the seal and the connecter’s face to prevent corrosion later and ease the installation now. So, it’s optional but advised.
Jose mendoza
Reviewed in the United States on May 4, 2025
Excelente producto
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