Toronado V6-231 3.8L (1986)
Idle Speed/Throttle Actuator - Electronic: Testing and Inspection
Chart C-2C - Idle Air Control
DIAGNOSTIC AIDS
Engine idle speed may be adversely affected by:
Park/Neutral Switch - If the ECM interprets the transaxle as always being in neutral, the idle will not be controlled at specified RPM when in drive.
Leaking Injector(s) - Leaking injectors will cause fuel imbalance and poor idle quality. See Chart A-7.
Vacuum leaks - Vacuum leaks can result in higher than normal idle.
TPS Sticking - When the TPS or throttle shaft is binding or sticking in an open throttle position, the ECM does not interpret the vehicle as not moving
and will not control idle.
EGR - In addition to the electronic control of EGR examine the EGR valve for proper seating.
Electrical Connections - Faulty battery, cables, or connection can result in voltage variations. The ECM will try to compensate, resulting in erratic idle
