Tune-Up - v8 Ford Cab & Chassis Ranger

ENGINE IDENTIFICATION

Engine can be identified by the eighth character of Vehicle Identification Number. Number is stamped on a metal plate, which is riveted to upper left corner of instrument panel and visible through left side of windshield.

VIN ENGINE CODE

TUNE-UP NOTES

Note. When performing tune-up procedures described in this article, the following notes and precautions must be followed.

For Tune-Up purposes "Light Duty" refers to vehicles up to 8500 lbs. GVW. "Heavy Duty" refers to vehicles exceeding 8500 lbs. GVW.

If Dura-Spark 2-piece distributor cap must be removed, first remove top portion, then rotor, then bottom portion (adapter). If any spark plug wire is disconnected with this system, connection must be first greased with silicone grease before it is reattached.

When connecting a tachometer to Dura-Spark ignition coil, install the alligator clip on tachometer into the "DEC" (Tach Testing) cavity.

When connecting tachometer to SSI ignition coil, install the alligator clip on tachometer into the "DEC" (TACH TEST) cavity.

Due to changes and corrections, always refer to Engine Tune-Up Decal in engine compartment before performing tune-up. If manual and decal differ, always use decal specifications.

Do not allow or create a condition of engine misfire in one or more cylinders for an extended period of time. Damage to converter from overheating may occur due to loading with unburned fuel.

ENGINE COMPRESSION

Test compression with all spark plugs removed and engine at normal operating temperature. Crank engine through at least 5 compression strokes before recording reading.

COMPRESSION SPECIFICATIONS

VALVE ARRANGEMENT

1. Right Bank - I-E-I-E-I-E-I-E (Front-to-rear).
2. Left Bank - E-I-E-I-E-I-E-I (Front-to-rear).

SPARK PLUGS

SPARK PLUG TYPE

SPARK PLUG SPECIFICATIONS

HIGH TENSION WIRE RESISTANCE

1. Loosen wires from spark plugs by twisting spark plug boot carefully to loosen seal on spark plug. Remove wires by pulling on plug boot. Remove distributor cap from distributor, leaving wires connected to cap. NOTE: DO NOT disconnect wires from distributor cap unless replacement is necessary.
2. Using an ohmmeter, check resistance of each wire by connecting one ohmmeter lead to spark plug terminal and other lead to distributor cap insert. Replace any wire with over 5000 ohms resistance per INCH. New wires should have a resistance of 7000 ohms per FOOT.

Note. Whenever a high tension wire is disconnected, the interior of spark plug terminal boot must be coated with dielectric silicone grease before connection.

HIGH TENSION WIRE RESISTANCE (OHMS)

Mechanical

Check mechanical fuel pump at curb idle RPM, with engine at normal operating temperature, and transmission in Neutral.

Electrical

Electric fuel pump system used with the 5.0L EFI engine consists of two fuel pumps; low pressure pump mounted in the fuel tank and a high pressure fuel pump mounted on the frame rail.

Electric fuel pump used with the 7.5L engine is a low pressure pump located in the fuel tank.

FUEL PUMP SPECIFICATIONS

VALVE CLEARANCE

All engines are equipped with hydraulic lifters. Adjust all valves to zero lash.

DISTRIBUTOR

Light Duty models with 5.0L and 5.8L Calif. (man. trans.) engines are equipped with EEC-IV TFI-IV (Thick Film Integrated) ignition system. All other models are equipped with Dura-Spark II ignition system. No adjustments are required.

5.0L & 7.5L Timing Marks & Firing Order (Magnetic Probe Is Located At 135 Degrees ATDC). Scheme 5

5.8L Timing Marks & Firing Order (Magnetic Probe Is Located At 135 Degrees ATDC). Scheme 6

IGNITION TIMING

Note. Magnetic probe timing device may be used if instrument is available and engine is so equipped. Timing probe offset is 135° ATDC.

1. Determine specified timing and mark degree line on damper (on some vehicles mark both pointer and damper notch). Disconnect and plug vacuum line(s) at distributor.
2. Connect tachometer. Connect timing light to No. 1 spark plug wire. If vehicle is equipped with a barometric sensor, disconnect the sensor from module. Connect Black and Yellow wires in module connector. If vehicle is equipped with EEC-IV, disconnect single wire Black connector near distributor. Set timing to specifications.

IGNITION TIMING SPECIFICATIONS (DEGREES BTDC @ RPM)

HOT (SLOW) IDLE RPM

Note. After engine adjustments are complete, reconnect all vacuum lines or hoses to their original positions. Reinstall air cleaner assembly. Run engine at 2500 RPM for 15 seconds and recheck curb idle speed. Final curb idle speed check must be made with air cleaner installed. Adjust as necessary and recheck dashpot clearance.

5.0L 2-Bbl. Idle Speed

1. Set the parking brake and block wheels. Place transmission in Neutral or "P". With engine at normal operating temperature, disconnect EVAP purge solenoid connector. Disconnect and plug vacuum line to Vacuum Operated Throttle Modulator (VOTM) kicker.
2. Place transmission in Drive. Check curb idle speed. If adjustment is necessary, loosen TSP-dashpot mounting bracket hold-down screw. Use the saddle bracket adjusting screw to adjust curb idle speed.
3. Place transmission in Neutral or Park. Increase engine speed momentarily. Place transmission in Drive and recheck curb idle. Adjust if required. Retighten TSP-dashpot mounting bracket hold-down screw. Reconnect VOTM kicker and EVAP purge solenoid.
4. Whenever idle speed is adjusted more than 50 RPM on automatic overdrive transmission (AOT) equipped vehicles, adjustment screw on the linkage lever at the carburetor should also be adjusted.
5. Place shift lever in Neutral position, and set parking brake. With engine off, back out linkage adjusting screw completely. Turn adjusting screw in to obtain .005" (.13 mm) clearance between end of screw and throttle lever. Turn screw in an additional 4 turns. Recheck curb idle.

IDLE SPEED (RPM)

Note. Curb idle speed is controlled by the EEC-IV processor and the Idle Speed Control (ISC) device. If the control system is operating properly, these speeds are self-compensating and cannot be changed by traditional adjustment techniques.

5.0L EFI Idle Speed Check

1. Set parking brake and block wheels. Bring engine to normal operation temperature and turn off. Place transmission in Neutral or "P". Turn A/C-Heat selector to the off position.
2. Ensure throttle linkage is free and travel is unobstructed. Ensure cruise control cable (if so equipped) is not holding the throttle open. Check for vacuum leaks.
3. Operate engine at 1800 RPM for at least 30 seconds. Place transmission in "D" (auto. trans.) or Neutral (man. trans.). Allow engine to stabilize. Check idle speed.
4. If curb idle speed is equal to or less than 675 RPM (auto. trans.), 775 RPM (man. trans.) do not adjust. If speeds exceed specified RPM turn engine off and disconnect the positive terminal of the battery and then reconnect. Repeat step 3).
5. If speeds still exceed specifications, perform EEC-IV Diagnosis/Repair then repeat step 3).
6. If idle speed is still not correct, back out idle air set screw until speed reaches 580-620 RPM (auto. trans.) or 680-720 RPM (man. trans.). Then back out the curb idle screw one-half additional turn to bring the throttle plate linkage into the nominal operating range of the ISC system.

5.8L 2-Bbl. Light Duty Idle Speed

1. With transmission in Neutral (man. trans.) or "P" (auto. trans.), start engine and let run until it reaches normal operating temperature. Disconnect and plug the vacuum hose to the VOTM kicker (leave connected on vehicles operating at elevations above 4000 ft.). Disconnect the EVAP purge solenoid electrical connector.
2. Run engine in Neutral at 2000 RPM for 120 seconds. Return engine to idle and place transmission in Neutral (man. trans.) or in "D" (auto. trans.).
3. Check/adjust curb idle RPM. If adjustment is required, loosen saddle bracket locking screw. Adjust idle speed using saddle bracket adjusting screw. Adjustment must be made within 90 seconds. Tighten saddle bracket locking screw.
4. Remove plug from VOTM vacuum hose and connect to VOTM (if disconnected). Connect EVAP purge solenoid electrical connector. Increase engine speed momentarily. Check idle speed. Readjust if necessary.

CURB IDLE (RPM)

5.8L 4-Bbl. Light Duty Idle and VOTM Speed

1. Place transmission in Neutral (man. trans.) or "P" (auto. trans.). With engine at normal operating temperature, turn A/C and heater selector switch off. Disconnect and plug vacuum hoses at air control valve, EGR valve and purge control valves. Disconnect EVAP purge solenoid connector. Disconnect and plug vacuum line to VOTM kicker.
2. Place transmission in Park (man. trans.) or "D" (auto. trans.). Check curb idle. If adjustment is necessary, use curb idle screw.
3. Place transmission in Neutral or Park, and increase engine speed momentarily. Place transmission in specified position, recheck curb idle. Adjust if required.
4. Connect an external vacuum source to the VOTM kicker and apply 10 in. Hg vacuum. Place transmission in Park (man. trans.) or "D" (auto. trans.). Check VOTM kicker speed. Loosen locknut on VOTM kicker and adjust to 700 RPM if necessary. Retighten locknut and remove vacuum source.
5. Remove plug from vacuum hose on VOTM kicker and reconnect. Reconnect all other vacuum hoses.

5.8L 2-Bbl. Heavy Duty Idle and Decel Throttle Control Speed

1. With transmission in Neutral (man. trans.) or "P" (auto. trans.), start engine and let run until it reaches normal operating temperature. Turn A/C and heater "OFF". Disconnect and plug vacuum hose from throttle kicker or from throttle kicker portion of TSP (Throttle Solenoid Positioner).
2. Install a slave vacuum hose from throttle kicker portion of TSP to intake manifold vacuum. Speed up engine momentarily. Check and adjust the decel throttle kicker RPM to specification by turning throttle kicker screw located in mounting bracket.
3. Disconnect slave vacuum hose from throttle kicker and intake manifold vacuum source. On auto. trans. models, increase engine speed momentarily, place transmission in "D" and check and adjust curb idle speed (TSP "ON") by adjusting bolt on back of TSP.
4. Disconnect Blue electrical wiring clip connecting TSP to engine wiring harness. Using curb idle speed set screw, check and adjust TSP "Off" RPM on (auto. trans.) or curb idle speed (man. trans.).
5. Remove plug and reconnect vacuum hose to throttle kicker or throttle kicker portion of TSP. Reconnect Blue electrical clip to TSP.

IDLE SPEED (RPM)

DECEL THROTTLE KICKER IDLE (RPM)

7.5L Vehicles Idle and Decel Throttle Control Speed

1. With transmission in Neutral (man. trans.) or "P" (auto. trans.), and A/C off, start engine. Operate engine until it reaches normal operating temperature. Remove air cleaner. Disconnect and plug decel throttle control kicker diaphragm vacuum hose.
2. Connect a slave vacuum hose from intake manifold vacuum to decel throttle control kicker. Run engine at 2500 RPM for 15 seconds. Release throttle. If decel throttle control kicker RPM is not within 50 RPM of specifications, adjust to proper RPM.
3. Disconnect slave vacuum hose and allow engine to return to idle. Check and adjust curb idle if necessary, using curb idle speed adjusting screw. Unplug, and reconnect vacuum hose to decel throttle control kicker diaphragm. Reinstall air cleaner.

IDLE SPEED (RPM)

DECEL THROTTLE KICKER (RPM)

IDLE MIXTURE ADJUSTMENT

Note. Idle mixture adjustment is not part of a normal tune-up. DO NOT adjust mixture unless carburetor has been disassembled or vehicle fails emissions testing.

Propane Enrichment Procedure

Note. This procedure is for Carbureted Light Duty Vehicles only.

1. Leave all vacuum signal hoses attached to air cleaner assembly when relocating air cleaner for carburetor adjustments. Air cleaner MUST be installed for engine speed checks. CAUTION: Do not let engine idle for extended periods, as catalyst overheating may cause excessive underbody temperatures.
2. Apply parking brake and block wheels. Disconnect automatic brake release, and plug vacuum connection. Remove the crankcase vent hose at the air cleaner, and allow hose to vent air from under hood. Connect tachometer.
3. Disconnect flexible fresh air tube from air cleaner duct or adapter. Insert hose from propane enrichment tool (Rotunda T75L 9600 A) about 3/4 of the way into duct or fresh air tube. Disconnect PCV valve from grommet, and allow valve to draw underhood air during adjustment.
4. For light duty trucks equipped with thermactor, disconnect and plug hoses of dump valves equipped with 2 vacuum fittings. If valves have one fitting or combination air by-pass/air control valve, remove and plug hose at valve. Connect slave hose to dump valve and intake manifold vacuum source.
5. For 5.0L and 5.8L vehicles equipped with 2-Bbl. carburetors, disconnect battery negative cable for 10 seconds and reconnect. Disconnect electrical connector from engine coolant temperature sensor. Remove and plug hose from the VOTM hose. Disconnect and plug hose from Manifold Absolute Pressure (MAP) sensor. Connect vacuum pump to MAP and apply 20 in. Hg. vacuum.
6. Check and adjust ignition timing if necessary. With engine at normal operating temperature, check curb idle speed or A/C "OFF" idle. Adjust as necessary. Run engine at 2500 RPM for 15 seconds before each mixture check.
7. With engine idling and transmission in Neutral, gradually open propane tool valve and watch for engine speed gain on tachometer. When speed reaches maximum and begins to drop off, note amount of speed gain. NOTE: Propane cartridge must be in vertical position. If engine speed will not drop off, check bottle gas supply. If necessary, repeat test with new bottle.
8. Compare measured speed gain with specifications. If mixture adjustment is necessary, adjust so gain is within "Reset RPM" specifications. If propane enrichment speed gain is within "RPM Gain" specifications, proceed to step 11).
9. If measured speed gain is greater than specification, turn mixture screws counterclockwise in equal amounts, and recheck until measured speed rise is within "Reset RPM" specifications. Proceed to step 11).
10. If measured speed gain is less than specification, turn mixture screws clockwise in equal amounts, and recheck until measured speed rise is within "Reset RPM" specifications.
11. Check curb idle, and remove all test equipment. Reconnect hoses and wiring to original locations, and connect crankcase vent hose.

PROPANE MIXTURE ADJUSTMENT (RPM) (1)

COLD (FAST) IDLE RPM

Note. Before adjusting Cold (Fast) Idle RPM, perform Hot (Slow) Idle RPM preliminary adjustments.

5.0L 2-Bbl.

1. With transmission in Neutral (man. trans.) or "P" (auto. trans.), warm engine to operating temperature. Disconnect and plug hoses at both EGR valve and thermactor air by-pass valve. Disconnect vacuum hose and electrical connector on EVAP purge solenoid.
2. Place fast idle adjusting screw on highest step of fast idle cam. Check and adjust (if necessary) fast idle by turning fast idle adjusting screw. Reconnect vacuum hoses and electrical connector.

FAST IDLE SPEED (RPM)

5.8L Light Duty

1. With transmission in Neutral (man. trans.) or "P" (auto. trans.), warm engine to operating temperature.
2. Disconnect and plug vacuum hose at EGR valve and purge valve. Disconnect electrical connector at EVAP purge solenoid (2-Bbl. models). Disconnect and plug vacuum hose at purge valve (4-Bbl. models).
3. Place fast idle adjusting screw on highest step of fast idle cam. Check and adjust (if necessary) fast idle by turning fast idle adjusting screw. Unplug and connect vacuum hoses. Connect electrical connector on 2-Bbl. models.

FAST IDLE SPEED (RPM)

5.8L Heavy Duty

1. With transmission in Neutral (man. trans.) or "P" (auto. trans.), warm engine to normal operating temperature. Disconnect and plug the hose between carburetor spacer and purge valve at carburetor spacer and plug nipple on the carburetor spacer. Disconnect and plug vacuum hose at EGR valve. Disconnect and plug vacuum hose at throttle kicker or at throttle kicker portion of TSP.
2. Place fast idle adjusting screw on 2nd step of fast idle cam and adjust fast idle to specified RPM by turning fast idle adjusting screw. Unplug and reconnect vacuum hoses.

FAST IDLE SPEED (RPM)

7.5L

1. With transmission in Neutral (man. trans.) or "P" (auto. trans.) and A/C "OFF", start engine and let run until it reaches normal operating temperature. Remove the air cleaner. Disconnect and plug throttle decel control diaphragm vacuum hose.
2. Disconnect and plug evaporative emission purge valve hose (if equipped) and EGR valve vacuum hose. Depress throttle lever and turn fast idle cam, by hand, until fast idle adjusting screw sets on the 2nd step of fast idle cam. Adjust fast idle to specified RPM by turning fast idle adjusting screw.
3. Unplug and reconnect all vacuum hoses. Reinstall air cleaner.

FAST IDLE SPEED (RPM)

DASHPOT ADJUSTMENT

1. Ensure idle speed and mixture are properly adjusted. Remove air cleaner and loosen dashpot lock nut. With choke open, hold throttle plate closed (idle position).
2. Check clearance between throttle lever pad and dashpot plunger tip. Plunger MUST be completely collapsed to check clearance. Turn dashpot in or out to obtain .090-.140 (2.3-3.6 mm) clearance. Tighten lock nut.

SOLENOID VENT VALVE TEST (5.0L & 5.8L)

1. Remove air cleaner. Turn ignition on and off. Solenoid should click if it is operating properly.
2. If not, disconnect electrical lead and connect a voltmeter between lead and ground. Turn ignition on and check for battery voltage. If not present, repair wiring as required.
3. If 12 volts are present at lead connector, check valve for binding and/or plugged condition. Repair as required. If valve is not binding and/or plugged, replace solenoid valve assembly. Reinstall air cleaner.

AUTOMATIC CHOKE

Loosen choke thermostat cover screws and turn choke cover in direction indicated on cover to specified setting.

AUTOMATIC CHOKE SPECIFICATIONS

5.0L and Light Duty 5.8L Calif. (man. trans.) models are equipped with Motorcraft TFI-IV EEC-IV ignition system. All other models are equipped with Motorcraft Dura-Spark II ignition system. Units are self-contained and require no outside adjustments.

DISTRIBUTOR PICK-UP COIL RESISTANCE

TOTAL SPARK ADVANCE @ 2500 RPM

COIL RESISTANCE - OHMS @ 75°F (24°C)

FUEL SYSTEMS

CARBURETORS

FUEL INJECTION

BATTERY

BATTERY SPECIFICATIONS

STARTER

All models use Motorcraft positive engagement type starters with either a 4" or 4 1/2" armature.

STARTER SPECIFICATIONS

ALTERNATOR

All models use Motorcraft alternators.

ALTERNATOR SPECIFICATIONS

ALTERNATOR REGULATOR

Two Motorcraft electronic voltage regulators are used. Although both look alike, they are not interchangeable.

REGULATOR IDENTIFICATION

BELT ADJUSTMENT

BELT ADJUSTMENT (TENSION IN LBS. (KG) USING STRAND TENSION GAUGE)

SERVICE INTERVALS

REPLACEMENT INTERVALS

CAPACITIES

COOLING SYSTEM CAPACITIES

FLUID CAPACITIES (EXCEPT COOLING)

SYSTEM REFRIGERANT CAPACITIES