Chris and Alana Posted February 19, 2009 Share Posted February 19, 2009 (edited) What would happen in the IACV actuator on the sequential system was stuck open? Edit. - Also what would happen if it was stuck shut? Edited February 21, 2009 by Chris and Alana (see edit history) Quote Link to comment Share on other sites More sharing options...
TrickTT Posted February 20, 2009 Share Posted February 20, 2009 It would idle very fast all the time, and when you hit boost, it would all blow back out of your air filter Quote Link to comment Share on other sites More sharing options...
Ian C Posted February 21, 2009 Share Posted February 21, 2009 It would idle very fast all the time, and when you hit boost, it would all blow back out of your air filter My take is that it'd rev up to about 3000rpm and the ECU would cut the ignition as a failsafe so it'd drop back down, then the ignition would cut back in and it would repeat. So your car would sit and rev up and down with metronomic regularity. Also when you were on boost (as if you'd drive it in that state let alone boot it) the boost will be contained as there is a one way rubber flap valve sat between the ICV and the plenum. However. This assumes that you meant the Idle Control Valve, which is sometimes known as the Idle Air Control Valve but on the Supra you've got an Intake Air Control Valve on the sequential system... So which bit did you mean? If the Intake Air Control Valve on the sequential system was stuck open I'd say that you'll not get boost on turbo #1 as it'll merrily vent backwards through turbo #2 to atmosphere. -Ian Quote Link to comment Share on other sites More sharing options...
hodge Posted February 21, 2009 Share Posted February 21, 2009 So if the air intake control valve is stuck shut then turbo 2 would not boost correctly. is this correct. Quote Link to comment Share on other sites More sharing options...
Ian C Posted February 22, 2009 Share Posted February 22, 2009 If it was stuck shut then you'd never see boost from turbo #2 and your car would feel very anaemic over 4000rpm. Turbo #1 would be doing all the work, resulting in overspeeding the turbo, overheating the air charge, and probably detonation on top - nasty. -Ian Quote Link to comment Share on other sites More sharing options...
Chris and Alana Posted February 22, 2009 Author Share Posted February 22, 2009 Thanks Ian Quote Link to comment Share on other sites More sharing options...
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