Your idle speed regulator and motor are both working fine. The idle speed regulator on the DeLorean is not spring loaded. The rotary slide valve rotates clockwise/counter clockwise, but it DOES NOT spin 360º. How the airflow is controlled: Attached to the end of the shaft inside of the motor is a piece of metal that blocks the airflow going into the engine. As the motor turns it either blocks to opening to decrease the amount of air going into the engine, or slides out of the way to allow more air to enter. How the motor works: Think of it like this: You have 2 electro magnets, and between them is a steel ball. If you want the ball to roll to the left, you would obviously give power to the left magnet. And when the ball has reached to point you want it to be at, you simply shut the magnet off and vice versa. The idle speed regulator works much in the same way. When idle is increased the ECU grounds the connection on one side to force the motor to rotate counterclockwise to open up airflow. Once the idle has reached it's desired RPM's, the ECU kills power to the magnet and again vice versa. How the entire idle speed system works: When the engine is on, power is applied to the idle speed ECU. When the gas pedal is at rest the throttle plates fully close (to give total control over to the ECU), and a microswitch is tripped. When this switch is tripped, it grounds a wire connection telling the ECU to activate. On the left side of the ignition coil is a white/slate wire. This wire feeds a signal back to the ECU to report the RPM's of the engine. From this signal the ECU determines weather or not to either increase or decrease the amount of air going into the engine in an effort to match the RPM's of the engine to the predetermined amount programmed into the ECU. The purpose of this is to keep the engine from dying if a load is placed on it while idling (i.e. air conditioning is turned on), and to keep the car fuel efficient and environmentally friendly (slower the engine runs, the less gas it will use, and the less emissions it will create). The only other part of the ECU is a thermal probe in the "Y" pipe on top of the engine. When the water is below a certain temp (50 some odd degrees or so), the ECU switches over to a cold temp RPM setting. Functions of the ECU are not disabled nor do they change in any way, the idle speed setting is only temporarily increased to slightly speed up the car's idle (a cold engine has more friction, plus it somewhat helps to warm the catalytic converter up quicker to reduce emissions). Even though the idle speed ECU shares the connection from the igntion coil with the ignition ECU for example, it works independantly of all other ECU's and their components. To test that your idle control system is working properly, try this: When your car is idling @ a normal temp, unplug the motor, then flip the A/C on. -Robert vin 6585 (The DeLorean from hell.) --- In dmcnews@xxxxxxxxxxx, Delorean17@xxxx wrote: <SNIP> when I remove the connector to the idle > speed motor nothing happens at all and it continues to idle fine. I thought > the car would die when the idle speed motor stopped. <SNIP>