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.
Idle Shutdown - Feature Option. The Idle Shutdown feature is used to limit the amount of idle time. This is a fuel saving feature which automatically shuts the engine down after a programmed time at idle. The Idle Shutdown Timer determines the length of time before the engine shuts down.