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HOMESERVICE MANUALSFORD1993PICKUP F250, 2D PICKUP, 5.0 N, STANDARD, M5OD-R2REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROLS - ADJUSTMENTSINTRODUCTIONIDLE SPEED & MIXTURE2.3L, 5.0L (WITH M/T OR C6 A/T) & 7.5L
1993 Ford Pickup F250, 2D Pickup, 5.0 N, Standard, M5OD-R2

2.3L, 5.0L (With M/T Or C6 A/T) & 7.5L

1993 Ford Pickup F250, 2D Pickup, 5.0 N, Standard, M5OD-R2SECTION 2.3L, 5.0L (With M/T Or C6 A/T) & 7.5L
  1. With engine off, disconnect negative battery cable for at least 5 minutes, then reconnect it. Start engine and allow idle speed to stabilize for 2 minutes. Snap throttle open and return to idle. Lightly press and release accelerator and allow engine to idle. If engine idles properly, idle speed adjustment is not required.
  2. If engine does not idle properly, unplug SPOUT in-line connector and verify base ignition timing is correct (2.3L and 5.0L only). On all models, with ignition off, disconnect IAC solenoid. Start engine and run at 2500 RPM for 30 seconds. Shift A/T to Park or M/T to neutral and apply parking brake. Check idle speed. If idle speed is less than specified in IDLE RPM SPECIFICATIONS table, go to next step. If idle speed is greater than specified, go to step 4).
    IDLE RPM SPECIFICATIONS

    Application RPM
    2.3L 475-575
    5.0L
    A/T 525-825
    M/T 550-850
    7.5L 500-700
  3. If idle speed is too low, check throttle body for presence of throttle plate orifice plug. See Fig 1. If there is no plug, rotate throttle return screw CLOCKWISE only to adjust idle speed. If there is a plug from previous service, remove it and turn screw in either direction to obtain correct idle speed. After adjustment, screw MUST be in contact with throttle lever pad.
    Fig 1: Installing Throttle Plate Plug
    G91J13440Courtesy of FORD MOTOR CO.
  4. If idle speed is too high, turn ignition off. Disconnect air cleaner hose. Using tape, block off orifice in throttle plate. See Fig 1. If orifice is already plugged, go to next step. On mass airflow engines, reconnect air cleaner hose. On all models, restart engine and check idle speed. If engine stalls, crack throttle plate open with throttle plate stop screw. See Fig 2. If idle speed is still too high, go to next step. If idle speed drops to specification, drops lower than specification or engine stalls, go to step 6).
  5. Perform a KOEO self-test. Check for fault codes, especially TPS fault code. If fault codes are present, repair as necessary. See appropriate TESTS W/CODES article in the ENGINE PERFORMANCE Section. If TPS fault code is present, check for proper TPS output. See THROTTLE POSITION SENSOR (TPS). If no fault codes are present, remove tape. Exit this procedure and see TESTS W/O CODES article in the ENGINE PERFORMANCE Section.
  6. Turn ignition off. Remove air cleaner hose. Remove tape from throttle plate orifice. See Fig 1. Select correct plug for orifice. Plugs are available in Throttle Plate Plug Kit (FOPE-9F652-AA).
  7. Reconnect air cleaner hose. Start engine. Recheck idle speed. If idle speed is not within specification, turn screw CLOCKWISE to obtain correct idle speed. Turn ignition off. Reconnect SPOUT in-line connector (if disconnected) and AIC solenoid lead.
  8. Move throttle plate to verify it is not stuck in bore and linkage is not keeping throttle from closing. Start engine and stabilize for 2 minutes. Snap throttle open and return to idle. With engine idling, lightly press and release accelerator to exercise ISC solenoid. If idle problem is still present, see TESTS W/O CODES article in the ENGINE PERFORMANCE Section to locate other possible causes of high idle.
Fig 2: Locating Throttle Return Screw (Typical)
G93B76381Courtesy of FORD MOTOR CO.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.