Actually, the FCV (Flow Control Valve) has absolutely nothing to do with throttle control, that is strictly a function controlled by the ECM by the amount of fuel injected and boost levels to maintain the proper air/fuel ratio at any given RPM.
The only function of the FCV is to close off the butterfly plate under certain engine operating conditions to create a low pressure zone (slight vacuum) in the intake manifold to help facilitate allowing exhaust gas to be sucked into the intake manifold and then into the combustion chambers.
The MAF sensor provides air flow information to the ECM which determines how the FCV operates to inject exhaust gas. That is why many owners before delete kits came into being early on simply unplugged the MAF to prevent EGR operation or installed a blank in the exhaust feed tube.
The FCV also closed off when the engine was shut off to help bring it to a slightly quicker stop. This was determined by many as totally unnecessary and is never missed once totally removed or disabled.
It was also reported that the FCV would close off to help prevent an overrevving engine situation (runaway), but no one to date has reported any runaways with their FCV valve or butterfly totally removed.
Just wanted to set the record straight and did not want anyone thinking the FCV butterfly acted anything like a throttle plate on a gas powered engine.
It is a totally different animal....
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Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited
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