LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 1996 >> Aerostar Van Window >> Repair and Diagnosis >> External Pages >> Different car >> Section 134 (Engine Controls - Adjustments - 3.0L) >> Adjustments >> Idle Speed & Mixture >> Aerostar

Idle Speed & Mixture: Aerostar

WARNING: This page is about a different car, the 1995 Mercury Villager, 1995 Ford Windstar, 1995 Ford Ranger, and 1995 Ford Aerostar. However, it is still accessible from the selected car via links, so may be relevant.
  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. Turn ignition off. Shift A/T to Park or M/T to Neutral, and apply parking brake. Disconnect IAC solenoid. Start engine and run at 2500 RPM for 30 seconds. Check idle speed. Idle speed should be 625-750 RPM. If idle speed is less than specified, go to next step. If idle speed is greater than specified, go to step 4).
  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 to obtain 625-750 RPM idle speed. If there is a plug from previous service, remove plug and turn screw in either direction to obtain 625-750 RPM 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 return 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 TP sensor fault code. If fault codes are present, repair as necessary. See TESTS W/CODES - EEC-IV (3.0L) article in the ENGINE PERFORMANCE section below. If TP sensor fault code is present, see THROTTLE POSITION (TP) SENSOR . If no fault codes are present, remove tape. Exit this procedure and see TESTS W/CODES - EEC-IV (3.0L) 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, proceed to TESTS W/O CODES - EEC-IV article in the ENGINE PERFORMANCE section below to locate other possible causes of high idle.
Fig 2: Locating Throttle Return Screw (All Models)
G93B76381Courtesy of FORD MOTOR CO.
scientia non olet · About LEMON Manuals