Please see the "Related Links" section of this answer for a detailed overview.
Yes Toyota vehicles with a 3.3L V6 engine that has VVT-i have timing belts.
No, older Prius used Toyota's 1.5 VVT-i and the current model uses the 1.8 VVT-i both use chains that are good for the life of the engine.
No, only 2000 and up
no
VVT-i, or Variable Valve Timing with intelligence, is an automobile variable valve timing technology developed by Toyota, similar in performance to the BMW's VANOS. The Toyota VVT-i system replaces the Toyota VVT offered starting in 24 December 1991 on the 5-valve per cylinder 4A-GE engine. The VVT system is a 2-stage hydraulically controlled cam phasing system. The Toyota motors CEO has been reported to have said, "VVT is the heart of every modern Toyota!"[citation needed]VVT-i, introduced in 1996, varies the timing of the intake valves by adjusting the relationship between the camshaft drive (belt, scissor-gear or chain) and intake camshaft. Engine oil pressure is applied to an actuator to adjust the camshaft position. Adjustments in the overlap time between the exhaust valve closing and intake valve opening result in improved engine efficiency.[1] Variants of the system, including VVTL-i, Dual VVT-i, VVT-iE, and Valvematic, have followed.
The P1520 code on a 2002 Toyota Tacoma indicates an issue with the Variable Valve Timing (VVT) system, specifically related to the VVT sensor or the VVT controller. This code often arises from a malfunctioning VVT sensor, low oil levels, or problems with the timing chain or belt. It can lead to reduced engine performance and efficiency. To resolve it, a thorough inspection of the VVT components and related systems is recommended.
The Toyota ones have a very good rep
Trouble code P1349 means: VVT System Malfunction
The procedure for finding the problem depends on what the problem is that you failed to list.
271 hp 4.7l i-force V8 W/VVT-I engine
"What is the VVT Cam Gear Unit?"
how to change vvt solenoid 2000echo