When does an engine go from high rpm to idle speed?

An engine must go from high RPM operation to idle, almost instantly. The idle circuit eases the transition and allows a more controlled reduction of speed. When the idle circuit fails, the engine may stall when we suddenly release the throttle.

When to move throttle control to slow or fast?

Move the application throttle control to the slow position, then to fast. Check the engine control to assure it stops against the high idle RPM stop bracket. NOTE: When the application throttle control lever is in the slow position the engine governor spring must be free of tension or pushing pressure. A non- free spring can affect the RPM.

How to change the accelerator pedal release position?

Accelerator Pedal Release Position Learning Procedure. Make sure that the accelerator pedal is fully released. Turn ignition switch “ON” and wait at least 2 seconds. Turn ignition switch “OFF” wait at least 10 seconds. Turn ignition switch “ON” and wait at least 2 seconds. Turn ignition switch “OFF” wait at least 10 seconds.

How to reset the idle speed in a GM TBI?

Unplug the IAC valve located on the passenger side, rear of the throttle body. Start the engine. Insert a T-30 size Torx driver into the Idle adjustment screw that is located behind the plug removed earlier. Turn the screw to adjust the idle speed to 650 RPM +/- 50 RPM.

How is the throttle connected to the accelerator?

In the old days, there used to be a cable that was connected from the throttle to the accelerator. But now in the technological age, the car’s computer controls when the throttle opens and closes by the feedback it gets about the acceleration of the vehicle.

What do you need to adjust the RPM of a car?

What you will need is a paperclip, torx screwdriver (T-25) to make adjustments and an accurate RPM gauge. If you can afford a diagnostic RPM gauge, we recommend that as the dashboard gauge isn’t exactly calibrated for tune up type of jobs. Start the car and let it warm to operating temperature.