The acceleration pedal doesn't have a physical connection with the throttle body, just position sensor, and wires. The throttle valve is electronically controlled by ETCS-I system (Electronic Throttle Control System - intelligent). The Toyota's ACIS varies the length of the intake manifold according to engine rpm by open and closes the intake air control valve. The 2GR engine has a variable geometry intake manifold made of plastic. The valve clearance is automatically adjusted via hydraulic lash adjusters (tappets). The valves are actuated via roller rocker arms. The valve timing is equipped with Toyota's Dual VVT-i system. The primary timing chain drives the intake camshafts only the exhaust camshafts are driven by intake camshafts via secondary chains. The engine has double overhead chain-driven camshafts (the intake and exhaust camshafts for both cylinder banks). There are steel-laminate type head gaskets between cylinder banks and heads. All components are made of aluminum alloy. The engine block is equipped with oil jets which spray oil on the pistons and reduce their temperature.Р”В®ach cylinder head is a three-piece unit: the cylinder head itself, the camshaft housing, and the valve cover. The aluminum alloy pistons have resin-coated skirts to reduce friction. The engine has a forged steel crankshaft with five counterweights and forged connecting rods.

The liners are cast into the block material. The V-angle between cylinder banks is 60 degrees. Like the 1GR-FE, the 2GR-FE has an open-deck type cast aluminum alloy cylinder block with spiny-type cast iron cylinder liners (sleeves).

Toyota 3l engine reliability