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.
With manual transmission vehicles you work the clutch yourself to shift gears. With an automatic transmission system, shifting is controlled by a complicated hydraulic system, which uses control solenoids to direct the transmission fluid.(Bizhan33/iStock/Getty Images).omputer Controls. The opening and closing of control solenoids is controlled by the computer on the solenoid pack, the unit on which all the control solenoids are mounted.