What is the idle stop screw setting on a 1993 Ford F150 with 4.9 six?

There isn't a single "idle stop screw setting" for a 1993 Ford F150 4.9L engine. The idle speed is controlled by a combination of factors, primarily the Throttle Position Sensor (TPS) and the computer's programmed idle air control. There's no adjustment screw in the traditional sense like on older carburetors.

While there might be a screw on the throttle body related to the idle air control, adjusting it is not recommended. Improper adjustment will likely lead to poor idle quality, stalling, drivability issues, and potentially damage to the engine control system.

If your 1993 F-150 4.9L has an idle speed problem (too high or too low), the issue is likely *not* a simple screw adjustment. Instead, you should:

* Check the battery and charging system: Low voltage can affect idle.

* Inspect the vacuum lines: Leaks in the vacuum system can cause idle problems.

* Clean the throttle body: A dirty throttle body can restrict airflow.

* Have the computer system scanned for trouble codes: A diagnostic code reader will help identify any underlying problems.

A qualified mechanic with a scanner can diagnose the precise cause of your idle issue and make the necessary repairs or adjustments. Attempting to adjust screws blindly could cause more problems than it solves.