does the engine have a carburetor or is it fuel injected? A carbed engine has mixture screws along with a base idle screw, a fuel injected engine the idle is computer controlled.
by the set screw on throttle cable
At the base of the carburetor are 2 screws. One adjusts the idle speed and the other adjusts the idle mixture. Screw the idle mixture in until the engine starts missing then screw it out 1 turn. Then, adjust the idle speed screw to about 850 RPM.
To adjust the idle on a 1986 Ford Tempo, locate the idle air adjustment screw on the throttle body. With the engine warmed up, use a tachometer to monitor the RPM. Turn the screw clockwise to increase the idle speed or counterclockwise to decrease it, aiming for the specified RPM in the owner's manual. After adjustments, ensure the engine runs smoothly and check for any vacuum leaks that could affect idle performance.
To adjust the carburetor on a 6-cylinder Ford engine, start by ensuring the engine is warmed up and idling smoothly. Use a screwdriver to adjust the idle mixture screws, turning them in or out to achieve the highest and smoothest idle speed. Next, adjust the idle speed screw to set the desired RPM, typically around 600-800 RPM for most models. Finally, double-check the adjustments by re-evaluating the idle quality and making any necessary fine-tuning.
You can adjust the idle.
turn the idle screw!
Turn the Idle Adjusting screw.
If your engine has a carburettor turn the idle adjust screw so the idle is at the proper speed. If your engine has fuel injection the ECM controls the idle.
You cant. The idle is controlled by the ecu.
The idle speed is computer controlled
The engine idle is controlled by the ECU, and is not adjustable. If the engine is not idling properly, either too fast or too slow, take it to a shop and have them check the OBDII codes.
To find the idle adjust on a caterpillar 3406 engine refer to the owners manual. If this doesn't help, contact the manufacturer.