At this point they are considered incertae sedis;in other words, we know that they are theropods; and probably coelurosaurs; but we don't know who they are related to or how they fit into the big picture of theropod phylogeny.
Idle speed is adjusted by means of the idle control valve, which is a solenoid-operated valve that is generally automatically adjusted by a computer. One problem that can occur with this component is a loss of power (from a severed line or a short) but a more common problem is simply dirt and grime.
A continuously variable valve timing mechanism, called a controller or. actuator, is used to adjust the camshaft from the starting stage to the. high speed traveling state. A camshaft timing Oil Control Valve (OCV), controlled by the ECM, directs engine oil pressure to the advance or retard side of the VVT-i. controller. Smooth Idle - At idle rpm, valve overlap is eliminated by retarding the. camshaft.