Does variable valve timing lower idle speed?
Variable Valve Timing (VVT) is a technology that’s used on many late model engines to improve fuel economy, idle smoothness, emissions and performance. Advancing valve timing improves idle quality and low RPM torque while retarding valve timing improves high end power.
What engines have variable valve timing?
Proprietary Terms for VVT
- Alfa Romeo – Twinspark technology.
- Audi – VVT.
- BMW – Valvetronic, VANOS and Double VANOS.
- Ford – Variable Cam Timing.
- GM – Double Continuous Variable Cam Phasing (DCVCP), Alloytec and Variable Valve Timing (VVT)
- Honda – VTEC, iVTEC and VTEC-E.
- Hyundai – MPI CVVT.
- Lexus – VVT-iE.
How does variable valve timing affect engine performance?
The timing, duration and lift of these valve events has a significant impact on engine performance. Without variable valve timing or variable valve lift, the valve timing is the same for all engine speeds and conditions, therefore compromises are necessary.
What are the codes for the Toyota Avalon?
Codes were Avalon: Hello, at my shop is a 2000 Toyota Avalon XLS 3.0 VVT-i. Hello, at my shop is… Hello, at my shop is a 2000 Toyota Avalon XLS 3.0 VVT-i. Came in for severe misfire at idle only. CEL blinking. Codes were P1349 VVT-I bank 1 problem, cyl 1 misfire p0301, cyl 3 misfire p0303, cyl 5 misfire p0305.
When did Alfa Romeo start using variable valve timing?
The system was engineered by Ing Giampaolo Garcea in the 1970s. All Alfa Romeo Spider models from 1983 onward used electronic VVT. In 1989, Honda released the VTEC system. While the earlier Nissan NVCS alters the phasing of the camshaft, VTEC switches to a separate cam profile at high engine speeds to improve peak power.
When did Nissan start using variable valve timing?
In 1987 Nissan debuted their electronic variable valve timing technology called NVCS in their DOHC VG20DET and VG30DE engines. In 1989, Honda released the VTEC system. While the earlier Nissan NVCS alters the phasing of the camshaft, VTEC switches to a separate cam profile at high engine speeds to improve peak power.