How does the intake valve work on a Toyota VVTi?
Engine designers have known for a long time that they could get better performance out of an engine under certain circumstances by allowing the intake valve to open slightly before the exhaust valve closes. This increases the time for the fuel/air mixture to enter the cylinder during the intake stroke.
When did Toyota start using variable valve timing?
VVT-i, or Variable Valve Timing with intelligence, is an automobile variable valve timing technology developed by Toyota, similar to the i-VTEC technology by Honda. The Toyota VVT-i system replaces the Toyota VVT offered starting in 1991 on the 4A-GE 20-Valve engine.
When did the Toyota VVTi engine come out?
In 1998, “ Dual” VVT-i (adjusts both intake and exhaust camshafts) was first introduced in the RS200 Altezza’s 3S-GE engine. Dual VVT-i is also found in Toyota’s new generation V6 engine, the 3.5L 2GR-FE V6. This engine can be found in the Avalon, RAV4, and Camry in the US, the Aurion in Australia, and various models in Japan, including the Estima.
What causes a car engine to have vibration?
If the cylinder’s coil is broken, it is quite easy to determine and repair. However, many engines use one coil to power two cylinders, so if that single coil has any problem, both cylinders are mostly die as well. Also, if you get a lean condition notification diagnostic code, you most likely to have a failure fuel injector.
What happens if you overheat your Toyota engine?
Overheating decreases your fuel economy and can cause serious damage to the engine. Pistons, rods, bearings and gaskets are just a few things vulnerable to overheating. Boiling coolant can ruin the radiator and hoses. Never ignore a high temperature reading on the dash gauge. Make sure your thermostat is working properly.
How does the VVT system in a Toyota work?
Most VVT is measured in early and late valve opening and closing. Closing intakes later, for example, can result in reduced pumping losses in partial load conditions, which reduces nitric oxide (NOx) emissions while only marginally affecting torque output.