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.
The intake manifold flow control valve flaps are the mechanical components that restrict airflow to the intake ports. When the valves are moved upward, airflow is restricted and tumble occurs.he intake manifold flow control valve and variable valve timing work together to improve fuel economy, idle stability, and emissions.