What does a VVT controller do?
In internal combustion engines, variable valve timing (VVT) is the process of altering the timing of a valve lift event, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with variable valve lift systems.
What are the symptoms of a bad VVT actuator?
Symptoms of a Bad or Failing Variable Valve Timing (VVT) Solenoid
- 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.
- Engine oil is dirty.
- Rough engine idle.
- Decrease in fuel economy.
What is VVTI engine technology?
VVT-i, or Variable Valve Timing with intelligence, is an automobile variable valve timing technology developed by Toyota. The Toyota VVT-i system replaces the Toyota VVT offered starting in 1991 on the 5-valve per cylinder 4A-GE engine. The VVT system is a 2-stage hydraulically controlled cam phasing system.
How does VVT-i system work?
The system works by using a variable-speed head for the camshaft. This increases or decreases the speed of the camshaft in relation to the engine’s drive timing. That, in turn, changes the duration of the valve lifting to control intake and exhaust.
What does VVT I stand for?
Variable Valve Timing-intelligent
Tokyo―TOYOTA MOTOR CORPORATION announced today the development of its new “Variable Valve Timing-intelligent” (VVT-i) technology, which increases performance and fuel economy. Engine development today necessitates both better fuel economy and advanced vehicle performance.
Is a VVT engine good?
Benefits of VVT There are many benefits to using VVT and virtually no drawbacks. One benefit is an increase in maximum engine speed (and therefore more peak power) – as much as a 25% increase. Low speed torque is also increased, providing better handling and drivability.
Can you drive with a bad VVT actuator?
Can You Drive with a Bad VVT Solenoid? Even though you may technically be able to continue driving with a bad VVT solenoid, the issue can cause damage to additional parts, such as the VVT actuator. So, you should address the issue as soon as possible.
Does VVT save fuel?
VVT and related lift systems help to improve combustion. That leads to better operation of the engine, lower emissions and a 1 to 6% reduction in fuel consumption.
Is a VVT I 2JZ?
2JZ. The 2,997 cc (3.0 L; 182.9 cu in) 2JZ has been produced since 1991 (first released in the 1991 Toyota Aristo). Cylinder bore and stroke is 86 mm × 86 mm (3.39 in × 3.39 in). VVT-i variable valve timing was added later in 1997 for the 1998 model year.
What are VVT gears?
More & more vehicles are equipped with VVT cam gear to improve fuel economy performance. The electronic technology allows right amount of oil supply to get into engine via variable valve timing solenoid adjustment. Automakers have their own names to this technology. Ford calls it Variable Camshaft Timing, VCT.
What does variable valve timing ( VVT ) do?
Variable Valve Timing (VVT) is used to vary engine performance and enhancements. On dual cam systems, the PCM controls the amount of variance on both cams separately. There are two actuators in the system; one for the exhaust cam and one for the intake cam.
When did Toyota start using the VVT-i system?
VVT-i came soon after, entering the market in 1996 by adding intake valve timing to the VVT’s cam phasing, becoming the norm in most of Toyota’s engine lineup today. Variations of VVT-i include: Why Vary the Lift and Timing?
When was the Dual VVT-i timing system introduced?
The Dual VVT-i system adjusts timing on both intake and exhaust camshafts. It was first introduced in 1998 on the RS200 Altezza’s 3S-GE engine.
When did the VVT system come out on the GTE?
The VVT system is a 2-stage hydraulically controlled cam phasing system. VVT-i, introduced on the 1JZ-GTE/2JZ-GTE engine in 1996, varies the timing of the intake valves by adjusting the relationship between the camshaft drive (belt or chain) and intake camshaft.