Engine Controls - Adjustments Ford Econoline E350

IDENTIFICATION

Note. Unless otherwise specified, references to Pickup include the F350 Super Duty commercial chassis.

MODEL IDENTIFICATION

MODEL IDENTIFICATION

ENGINE MECHANICAL

Before performing any on-vehicle adjustments to fuel or ignition systems, ensure engine mechanical condition is okay.

VALVE CLEARANCE

Note. Valve cover(s) must be removed before performing valve adjustment. See appropriate article in the ENGINES section for removal and installation procedures.

2.3L Valve Clearance Adjustment

Note. Valve clearance is nonadjustable, but clearance can be checked to determine if worn components exist.

1. Rotate camshaft so base circle of camshaft lobe is positioned on valve to be checked. Using Valve Spring Compressor (T88T-6565-BH), apply pressure on cam follower until lash adjuster is fully collapsed.
2. While holding lash adjuster in fully collapsed position, use feeler gauge to measure clearance between base circle of camshaft and camshaft follower. See «2.3L COLLAPSED LIFTER VALVE CLEARANCE»(/ford/econoline-e350/1985-1999/remont/adjustments/#engine-controls-adjustments) .
3. If clearance is not within specification, inspect camshaft follower for damage. If camshaft follower is not damaged, check for sticking valve, worn valve spring or camshaft lobe(s). If components are okay, check for defective lash adjuster. Replace components as necessary.

2.3L COLLAPSED VALVE LIFTER CLEARANCE

2.9L Valve Clearance Adjustment

1. Position camshaft lobe on cylinder to be adjusted so that rocker arm is on the base circle area. Loosen adjusting screw on rocker arm until a distinct lash between rocker arm pad and valve tip can be noticed. Plunger of lash adjuster should be fully extended.
2. Carefully screw in the adjusting screw until rocker arm slightly touches valve stem. To achieve nominal working position of the plunger, screw in adjusting screw an additional 1 1/2 turns, which is equivalent to .07" (2 mm).

3.0L Valve Clearance Adjustment

Note. Hydraulic valve lifters are used; no valve adjustment is required. If incorrect valve clearance is suspected, lifter must be collapsed before clearance can be checked.

1. Position No. 1 piston at TDC of compression stroke. Slowly apply pressure until valve lifter is completely collapsed on No. 1 intake.
2. Holding lifter in collapsed position, measure clearance between rocker arm and tip of valve stem. If clearance is not within specification, repair or replace components as necessary. See «3.0L COLLAPSED VALVE LIFTER SPECIFICATIONS»(/ford/econoline-e350/1985-1999/remont/adjustments/#engine-controls-adjustments) .
3. Repeat procedure for exhaust valves No. 1, No. 2 and No. 4, and intake valves No. 3 and No. 6. Rotate crankshaft 360 degrees (one revolution). Repeat procedure for exhaust valves No. 3, No. 5 and No. 6, and intake valves No. 2, No. 4 and No. 5.

3.0L COLLAPSED VALVE LIFTER SPECIFICATIONS

4.0L Valve Clearance Adjustment

Note. Hydraulic roller valve lifters and nonadjustable rocker arms are used; valve adjustment is not possible. Manufacturer supplies no procedure for checking valve clearance. If valve lifters are found to be excessively worn or noisy, test and repair or replace as necessary.

4.9L Valve Clearance Adjustment

Note. Hydraulic valve lifters are used; no valve adjustment is required. If valve clearance is incorrect, use oversize or undersize push rods to correct clearance.

1. Position crankshaft so No. 1 piston is at TDC on compression stroke. Using chalk, make 2 marks on vibration damper. The first mark must be 120 degrees from timing mark. Make the second mark 120 degrees from first mark. This will divide the damper into three equal parts to facilitate checking valve clearance on all cylinders.
2. Ensure rocker arm bolts on cylinder No. 1 are tightened to 17-23 ft. lbs. (23-31 N.m). Using Lifter Bleed Down Wrench (T70P-6513-A), slowly apply pressure to bleed down lifter until plunger is completely bottomed.
3. Measure clearance between rocker arm and valve stem. See «4.9L COLLAPSED VALVE LIFTER CLEARANCE»(/ford/econoline-e350/1985-1999/remont/adjustments/#engine-controls-adjustments) . If clearance is not within specification, install longer or shorter push rod to obtain correct clearance.
4. Rotate engine to next mark on vibration damper. Repeat procedure on each succeeding cylinder in firing order (1-5-3-6-2-4), rotating engine to next mark on damper before checking clearance.

4.9L COLLAPSED VALVE LIFTER CLEARANCE

5.0L Valve Clearance Adjustment

Note. Hydraulic valve lifters are used; no valve adjustment is required. If valve clearance is incorrect, use oversize or undersize push rods to correct clearance.

1. Rotate crankshaft in normal operation direction until No. 1 cylinder is at TDC of compression stroke. Using Lifter Bleed Down Wrench (T71P-6513-B), apply pressure to No. 1 intake valve lifter tappet until lifter is completely bottomed.
2. Hold valve lifter in this position while measuring clearance between valve lifter and valve stem. Record measurement. Repeat this procedure for intake valves No. 7 and No. 8, and exhaust valves No. 1, No. 5 and No. 4.
3. Rotate crankshaft 180 degrees (1/2 turn). Bleed lifter and check intake valves No. 5 and No. 4, and exhaust valves No. 2 and No. 6. Rotate crankshaft 270 degrees (3/4 turn). Bleed lifter down and check intake valves No. 2, No. 3 and No. 6, and exhaust valves No. 3, No. 7 and No. 8. Record measurement and compare it to specification. See «5.0L COLLAPSED VALVE LIFTER CLEARANCE»(/ford/econoline-e350/1985-1999/remont/adjustments/#engine-controls-adjustments) . If clearance is not within specification, use shorter or longer push rod to obtain correct clearance.

5.0L COLLAPSED VALVE LIFTER CLEARANCE

5.8L Valve Clearance Adjustment

Note. Hydraulic valve lifters are used; no valve adjustment is required. If valve clearance is incorrect, use oversize or undersize push rod to obtain correct clearance.

1. Rotate crankshaft in normal operation direction until No. 1 cylinder is at TDC of compression stroke. Using Lifter Bleed Down Wrench (T71P-6513-B), apply pressure to No. 1 intake valve lifter until lifter is completely bottomed.
2. Hold valve lifter in this position while measuring clearance between valve lifter and valve stem. Record measurement. Repeat this procedure for intake valves No. 4 and No. 8, and exhaust valves No. 1, No. 3 and No. 7.
3. Rotate crankshaft 180 degrees (1/2 turn). Bleed lifter and check intake valves No. 3 and No. 7, and exhaust valves No. 2 and No. 6. Rotate crankshaft 270 degrees (3/4 turn). Bleed lifter down and check intake valves No. 2, No. 5 and No. 6, and exhaust valves No. 4, No. 5 and No. 8. Record measurement and compare it to specification. See «5.8L COLLAPSED VALVE LIFTER CLEARANCE»(/ford/econoline-e350/1985-1999/remont/adjustments/#engine-controls-adjustments) . If clearance is not within specification, use shorter or longer push rod to obtain correct clearance.

5.8L COLLAPSED VALVE LIFTER CLEARANCE

7.3L (Diesel) Valve Clearance Adjustment

Note. Hydraulic valve lifters are used; no valve adjustment is required. If incorrect valve clearance is suspected, lifter must be collapsed before clearance can be checked.

Position each piston at TDC of compression stroke so both valves are closed. Using Lifter Bleed Down Wrench (T83T-6500-A), bleed down lifters until lifter plunger bottoms. Check valve clearance. See 7.3L (DIESEL) COLLAPSED VALVE LIFTER SPECIFICATIONS . If clearances are not correct, check valve train components for wear and damage. Replace as necessary.

7.3L (DIESEL) COLLAPSED VALVE LIFTER SPECIFICATIONS

7.5L Valve Clearance Adjustment

Note. Hydraulic valve lifters are used and no valve adjustment is required. If valve clearance is incorrect, use oversize or undersize push rod to obtain correct clearance.

1. Rotate crankshaft in normal operation direction until No. 1 cylinder is at TDC of compression stroke. Using Lifter Bleed Down Wrench (T71P-6513-B), apply pressure to No. 1 intake valve lifter until lifter is completely bottomed.
2. Hold valve lifter in this position while measuring clearance between lifter and valve stem. Record measurement. Repeat this procedure for intake valves No. 3, No. 7 and No. 8, and exhaust valves No. 1, No. 4, No. 5 and No. 8.
3. Rotate crankshaft 360 degrees (one turn). Bleed lifter and check intake valves No. 2, No. 4, No. 5 and No. 6, and exhaust valves No. 2, No. 3, No. 6 and No. 7. Record measurement and compare it to specification. See «7.5L COLLAPSED VALVE LIFTER CLEARANCE»(/ford/econoline-e350/1985-1999/remont/adjustments/#engine-controls-adjustments) . If clearance is not within specification, use shorter or longer push rod to obtain correct clearance.

7.5L COLLAPSED VALVE LIFTER CLEARANCE

GASOLINE ENGINES

Note. Ignition timing on 2.3L with DIS and 4.0L with EDIS is not adjustable.

INITIAL TIMING (TFI-IV)

1. Place transmission in Park or Neutral. Ensure A/C and heater are off. Connect inductive timing light and tachometer to engine. With engine off, disconnect the single-wire in-line SPOUT (Yellow/Light Green wire near distributor) connector or remove shorting bar from the double-wire SPOUT connector. For location (Scheme 1) Start and warm engine to normal operating temperature.
2. With engine at idle speed, check/adjust initial timing to 10 degrees BTDC. Turn engine off and reconnect the single-wire in-line SPOUT connector or reinstall shorting bar on double-wire SPOUT connector. Start engine and check timing advance to verify distributor is advancing beyond initial setting. Remove test equipment and reconnect all disconnected components.

Scheme 1

STATIC TIMING

1. Remove fast idle bracket and solenoid from injection pump. Using Pump Mounting Wrench (T83T-9000-B), loosen nuts holding injection pump to pump mounting adapter. Install Rotating Wrench (T83T-9000-C) on front of pump, and rotate to align timing mark on pump mounting flange with timing mark on pump mounting adapter. (Scheme 2)
2. Align timing marks to within.030". Remove rotating wrench and tighten nuts to 84 INCH lbs. (9.5 N.m). Ensure timing marks are aligned. Install fast idle bracket and solenoid.

Scheme 2

DYNAMIC TIMING

Note. Engine must be at normal operating temperature of 192-212°F (89-100°C) when checking/setting dynamic timing.

1. Bring engine to normal operating temperature. Stop engine and install Dynamic Timing Meter (078-00200) into timing probe hole until it almost touches vibration damper. (Scheme 3)
2. Attach clamp from Timing Meter Adapter (078-00201) to line pressure sensor on No. 1 injector nozzle ("F" Series) or No. 4 injector nozzle ("E" Series), and connect to dynamic timing meter. Connect dynamic timing meter to battery and dial in minus 20 degrees offset on meter.
3. Disconnect cold start advance terminal connector from solenoid terminal. (Scheme 4) With transmission in Neutral and rear wheels raised, start engine. Using Throttle Control Tool (D83T-9000-E), set engine speed to 2000 RPM with no accessory load.
4. Observe injection timing on dynamic timing meter. Injection timing should be 8.5 degrees BTDC at 2000 RPM. Apply battery voltage to cold start advance solenoid. Activating cold start advance solenoid terminal can increase engine speed. Adjust throttle if necessary.
5. Timing at 2000 RPM should be at least one degree before the timing obtained in first timing check. If advance is less than one degree, replace fuel injection pump top cover assembly. If dynamic timing is not within +/-2 degrees of specification, adjust pump timing.

Scheme 3

Scheme 4

Fast idle speed is computer controlled. Adjustment procedures are not available.

7.3L Diesel

1. Connect tachometer. Place transmission in Neutral or Park. Start engine and bring to normal operating temperature. Disconnect fast idle solenoid from harness and apply battery voltage to activate solenoid.
2. Rev engine momentarily to set solenoid. Fast idle should be 800-850 RPM. Adjust by turning solenoid plunger. (Scheme 4) Recheck fast idle and adjust if necessary. Reconnect solenoid connector.

Idle Adjustment Precautions

Idle speed, on all engines, is controlled by ECA and idle speed control air by-pass valve. If control system is operating properly, engine idle RPM is fixed and cannot be changed by standard adjustments. Many engines do not provide an RPM specification. A scan tester must be used on these systems because control strategy and idle speed specification is controlled by ECA.

Before performing idle speed adjustment procedure, complete a thorough basic inspection and self-test (KOEO, KOER, Continuous Memory self-tests) to confirm operation of sub-systems contributing to idle speed control problems. See appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section.

Before performing idle speed check and adjustment procedures, ensure throttle bore and both sides of throttle plate(s) are clean. Ensure throttle plate does not stick in bore and/or linkage is not limiting throttle plate operation. Throttle lever MUST be resting on throttle stop screw. When idle speed control device (air by-pass solenoid or DC motor) is disconnected to set minimum air rate, engine may stall. This is acceptable only if throttle plate and linkage are not stuck.

Some throttle bodies use sludge tolerant throttle plate designs. See THROTTLE PLATE COATING INDEX for application.

THROTTLE PLATE COATING INDEX

These units must not be cleaned because a protective coating is applied to the lip of throttle plate(s). (Scheme 5)for location of identification label.

Scheme 5

Turn off all accessories before checking and adjusting idle speed. Ensure cooling system is filled to correct level. Ensure there are no vacuum leaks or unmetered air entering the throttle chamber on mass airflow design systems. If vehicle is equipped with electric cooling fan, check and adjust idle speed when fan is off.

Scheme 6

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 depress 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, disconnect the SPOUT in-line connector and verify base ignition timing is correct (2.3L only). With ignition off, disconnect idle speed control air by-pass solenoid. Start engine and run at 2500 RPM for 30 seconds. Place A/T in Park (Neutral on M/T) and apply parking brake. Check idle speed. If idle speed is less than 475-575 RPM (2.3L), 550-675 RPM (3.0L), 555-725 RPM (4.0L) or 500-800 RPM (7.5L), go to next step. If idle speed is greater than specified, go to step 5.
3. If idle speed is too low, check throttle body for presence of throttle plate orifice plug. (Scheme 6) If there is no plug, turn idle adjusting screw CLOCKWISE only to adjust idle speed. If there is a plug from previous service, remove it and turn screw to obtain correct idle speed. After adjustment, idle adjusting screw MUST be in contact with throttle lever pad.
4. Turn engine off and disconnect battery for 5 minutes. Reconnect SPOUT in-line connector and ISC by-pass solenoid power lead. Move throttle plate to ensure it is not stuck in bore. Start engine and stabilize for 2 minutes. Snap throttle open and let it return to idle. With engine idling, lightly depress and release accelerator to exercise the ISC solenoid.
5. If idle speed is too high, turn ignition off. Disconnect air cleaner hose. Using tape, block off orifice in throttle plate. (Scheme 6) 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 using throttle plate stop screw. (Scheme 7) If idle speed is still too high, go next step. If idle speed drops to specification, drops lower than specification, or engine stalls, go to step 7.
6. 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)»(/ford/econoline-e350/1985-1999/remont/adjustments/#engine-controls-adjustments). If no fault codes are present, remove tape. Exit this procedure and refer to TESTS W/O CODES article in the ENGINE PERFORMANCE section.
7. Turn ignition off. Remove air cleaner hose. Remove tape covering the throttle plate orifice. (Scheme 6) Select correct plug for the orifice. Plugs are available in Throttle Plate Plug Kit (FOPE-9F652-AA).
8. Reconnect air cleaner hose and start engine. Recheck idle speed. If idle speed is not within specification, turn adjusting screw CLOCKWISE to obtain correct idle speed. Turn ignition off. Connect SPOUT in-line connector (2.3L only) and ISC by-pass solenoid power lead.
9. Move throttle plate to ensure 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 depress and release accelerator to exercise ISC solenoid. If idle problem is still present, refer to TESTS W/O CODES article in the ENGINE PERFORMANCE section to locate other possible causes of high idle.

Scheme 7

2.9L, 4.0L & 7.5L Without Sludge Tolerant Throttle Body

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 depress and release accelerator.
2. Allow engine to idle. Ensure electric cooling fan is off. If engine idle is okay, idle speed adjustment is not required. If engine does not idle properly, turn ignition off. Disconnect idle speed control air by-pass solenoid.
3. Place A/T in Park (Neutral on M/T). Start engine and run at 2500 RPM for 30 seconds. Apply parking brake. Check idle speed. If idle speed is not 600-725 RPM (2.9L), 550-725 RPM (4.0L) or 500-800 RPM (7.5L), turn throttle plate stop screw to obtain specification. (Scheme 7) Turn ignition off. Reconnect idle speed control air by-pass solenoid and recheck idle speed.
4. If idle speed is still not correct, 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)»(/ford/econoline-e350/1985-1999/remont/adjustments/#engine-controls-adjustments). If fault codes are not present, exit this procedure and refer to TESTS W/O CODES article in the ENGINE PERFORMANCE section.
5. Move throttle plate to ensure 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 depress and release accelerator. If idle problem is still present, refer to TESTS W/O CODES article in the ENGINE PERFORMANCE section to locate other possible causes of high idle.

5.0L (Except E4OD)

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 depress 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, turn engine off. Install a.050" (1.27 mm) feeler gauge (A/T) or.030" (.76 mm) feeler gauge (M/T) between throttle plate stop screw and throttle lever. Disconnect SPOUT in-line connector and verify base ignition timing is correct. With ignition off, disconnect idle speed control air by-pass solenoid. Start engine and allow to idle for 120 seconds. Place A/T in Park (Neutral on M/T) and apply parking brake. Check idle speed. If idle speed is less than 525-825 RPM (A/T) or 550-850 RPM (M/T), go to next step. If idle speed is greater than specified, go to step 5.
3. If idle speed is too low, check throttle body for presence of throttle plate orifice plug. (Scheme 6) If there is no plug, turn idle adjusting screw CLOCKWISE only to adjust idle speed. If there is a plug from previous service, remove it and turn screw to obtain correct idle speed. After adjustment, idle adjusting screw MUST be in contact with lever pad.
4. Turn engine off and disconnect battery for 5 minutes. Reconnect SPOUT in-line connector and ISC by-pass solenoid power lead. Move throttle plate to ensure it is not stuck in bore. Start engine and stabilize for 2 minutes. Snap throttle open and let it return to idle. With engine idling, lightly depress and release accelerator to activate the ISC solenoid.
5. If idle speed is too high, turn ignition off. Disconnect air cleaner hose. Using tape, block off orifice in throttle plate. (Scheme 6) 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 using throttle plate stop screw. (Scheme 7) 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 7.
6. 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)»(/ford/econoline-e350/1985-1999/remont/adjustments/#engine-controls-adjustments). If fault codes are not present, remove tape. Exit this procedure and refer to TESTS W/O CODES article in the ENGINE PERFORMANCE section.
7. Turn ignition off. Remove air cleaner hose. Remove tape covering throttle plate orifice. (Scheme 6) Select correct plug for orifice. Plugs are available in Throttle Plate Plug Kit (FOPE-9F652-AA).
8. Reconnect air cleaner hose, remove feeler gauge and start engine. Recheck idle speed. If idle speed is not within specification, turn adjusting screw CLOCKWISE to obtain correct idle speed. Turn ignition off. Connect SPOUT in-line connector and ISC by-pass solenoid power lead.
9. Move throttle plate to ensure 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 depress and release accelerator to activate ISC solenoid. If idle problem is still present, refer to TESTS W/O CODES article in the ENGINE PERFORMANCE section to locate other possible causes of high idle.
10. On vehicles equipped with AOD transmission, check throttle valve pressure adjustment.

Note. Engine RPM oscillations may occur if throttle plate is open far enough to expose canister purge port. To verify, disconnect and plug purge port on throttle body. If problem no longer exists, close throttle plate just enough to eliminate oscillations.

4.9L, 5.0L (With E4OD) & 5.8L

1. Connect scan tester to diagnostic connector. Enter KOER self-test. A single-pulse tone indicates entry mode has been successfully entered. Observe scan tester read-out.
2. If a constant tone, solid light or STO LO is displayed, base idle speed is within range and adjustment is not necessary. Exit self-test.
3. If a beeping tone, flashing light or STO LO at 8 Hz is displayed, TPS is out of range and adjustment may be required. Perform adjustment and repeat test.
4. If a beeping tone, flashing light or STO LO at 4 Hz is displayed, base idle speed is too high. Go to step 8.
5. If a beeping tone, flashing light or STO LO at one Hz is displayed, base idle speed is too low. Go to next step.
6. DO NOT clean throttle bore. Check throttle plate for presence of throttle plate orifice plug. (Scheme 6) If there is no plug, turn idle adjusting screw CLOCKWISE only to adjust idle speed until conditions in step 2) are obtained. If there is a plug from previous service, remove plug and turn screw to obtain conditions in step 2. After adjustment, screw MUST be in contact with throttle lever pad.
7. Perform a KOEO Self-Test to ensure TPS fault code is not present. Move throttle plate to ensure it is not stuck in bore and linkage is not keeping throttle from closing. On models with automatic overdrive transmissions, check throttle valve adjustment.
8. If idle speed is too high, turn engine off. Using tape, block off orifice in throttle plate. (Scheme 6)
9. 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 using throttle plate stop screw. If idle speed is still too high, go to next step. If idle speed drops to specification or drops lower than specification, go to step 11.
10. Perform KOEO self-test. 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)»(/ford/econoline-e350/1985-1999/remont/adjustments/#engine-controls-adjustments). Ensure adjustment screw is in contact with lever pad. If fault codes are not present, see TESTS W/O CODES article in the ENGINE PERFORMANCE section.
11. Turn ignition off. Remove air cleaner hose and remove tape covering throttle plate orifice. Select correct color plug for orifice. Plugs are available in Throttle Plate Plug Kit (FOPE-9F652-AA).
12. Reconnect air cleaner hose and start engine. Recheck idle speed. If idle speed is not within specification, turn adjusting screw CLOCKWISE to obtain correct idle speed. After adjustment, screw MUST be in contact with throttle lever pad.
13. On all models, perform a KOEO self-test to ensure TPS fault code is not present. Move throttle plate to ensure it is not stuck in bore and linkage is not keeping throttle from closing. On models with automatic overdrive transmissions, check throttle valve pressure adjustment.

IDLE ADJUSTMENT PROCEDURES (DIESEL ENGINES)

1. Place transmission in Neutral or Park and bring engine up to normal operating temperature. Check idle speed with transmission in Neutral (M/T) or Drive (A/T). Ensure curb idle adjustment screw is against the stop. If adjustment screw is not against the stop, correct linkage.
2. Connect tachometer and check curb idle speed. Idle speed should be 600-700 RPM. Adjust idle speed using curb idle speed adjustment screw. (Scheme 4) Repeat check, and adjust again if necessary.

Note. Throttle Position Sensor (TPS) on gasoline engines is not adjustable. Replace TPS if sensor is not within specification.

1. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion or loose wires; repair as necessary. Connect Breakout Box (T83L-50-EEC-IV) and reconnect ECA to breakout box. Connect digital voltmeter positive lead to pin No. 47 and negative lead to pin No. 46. Turn ignition on. Observe voltmeter reading while moving throttle slowly to Wide Open Throttle (WOT) position. Release throttle slowly to closed position. See «TPS VOLTAGE SPECIFICATIONS»(/ford/econoline-e350/1985-1999/remont/adjustments/#engine-controls-adjustments) .
2. If voltage is not as specified, ensure throttle stop screw and linkage are adjusted correctly. Remove TPS and check for damaged, corroded or misadjusted pins. If pins are okay, install sensor. Ensure sensor is seated correctly. Repeat step 1 . If voltage is not as specified, perform KOEO self-test. See appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section.

TPS VOLTAGE SPECIFICATIONS (1)

Scheme 8

1. Install scan tester and enter Key On Engine Off (KOEO) self-test while holding throttle in Wide Open Throttle (WOT) position. After last service code has been displayed, remain in self-test. Place a 0.515" (13.08 mm) Gauge Block (T83T-7B200-AH) between fuel pump lever travel screw and gauge boss. (Scheme 8)
2. Cycle Overdrive Cancel Switch (OCS) once. Observe Self-Test Output (STO) on scan tester for the following conditions: Constant tone, solid light, or STO LO readout indicates throttle position sensor is within range. Cycle OCS to exit test. Fast beeping tone, flashing light, or STO LO erratic readout (4 per second) indicates throttle position sensor requires adjustment. Slow beeping tone, flashing light, or STO LO erratic readout (one per second) indicates throttle position sensor requires adjustment. No tone, solid light, or STO LO readout indicates throttle position sensor may have worn internal components. Check by trying to move sensor.
3. If FIPL sensor and bracket screws are tight and there are no signs of wear between mounted parts, loosen FIPL sensor attachment screws. (Scheme 9) Rotate sensor one way or the other until a constant tone, solid light, or STO LO readout is obtained. Tighten FIPL sensor attachment screws. Remove gauge block. Cycle throttle lever to WOT 5 times. Reinsert gauge block to verify setting.

Scheme 9

See also:
• 2.3L COLLAPSED LIFTER VALVE CLEARANCE