Tune-Up - v8 Ford LTD Crown Victoria I

VEHICLE IDENTIFICATION NUMBER CODE

Engine can be identified by the eighth character of the Vehicle Identification Number (VIN) which is stamped on plate on top left corner of instrument panel, and which is visible through the windshield.

VIN ENGINE CODES

TUNE-UP NOTES

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

Due to late changes and corrections, always refer to Engine Tune-Up Decal in engine compartment, before attempting tune-up. In the event manual specifications and decal specifications are different, always rely on the specifications on the Engine Tune-Up Decal.

On 5.8L Engines, if the Dura Spark 2-piece distributor cap must be removed, first remove top portion, then rotor, and then bottom portion. If any spark plug wire is disconnected with this system, the connection must first be coated with silicone grease before reconnection.

When connecting a tachometer to Dura Spark ignition coil, install the alligator clip on tachometer into "DEC" (TACH TESTING) cavity of coil.

Do not allow or create a condition of engine misfire in more than one cylinder for more than 30 seconds. Damage to converter may result due to loading converter with unburned air/fuel mixture.

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. Maximum variation between cylinders should not exceed 25%.

SPARK PLUGS

SPARK PLUG TYPE

SPARK PLUG INSTALLATION

HIGH TENSION WIRE RESISTANCE

1. Loosen wires from spark plugs by twisting spark plug boot carefully to loosen seal on 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. If any wire has more than 7000 ohms resistance per foot, remove wire from cap and recheck. If resistance still exceeds 7000 ohms per foot, replace wire.

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

VALVE CLEARANCE

VALVE CLEARANCE ADJUSTMENT

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).

DISTRIBUTOR

On 5.0L models, the TFI-IV ignition system is used. On 5.8L Police models, the Dura Spark II with UIC (Universal Integrated Circuit) ignition system is used. No adjustments are required on either system.

5.0L SFI Firing Order & Timing Marks (Exc. Mark VII LSC & Mustang). Scheme 1

5.0L SFI H.O. (Mark VII LSC & Mustang) & 5.8L 2-Bbl. Firing Order & Timing Marks. Scheme 2

IGNITION TIMING

Note. Timing instrument should be connected to number one spark plug using inductive adapter or snap-on connector. Do not puncture spark plug wire or boot to make connection.

Carbureted Models

1. Set parking brake and block wheels. Disconnect automatic parking brake release. Place transmission in "P" (auto. trans.). Turn air conditioner and heater off. Disconnect and plug vacuum lines at distributor. Connect timing light and tachometer to engine.
2. Disconnect 2-wire connector from ignition module and install a jumper wire between the 2 pins (Yellow and Black wires).
3. Start engine and warm to normal operating temperature. With engine at timing RPM, adjust timing. Remove jumper wire. Reconnect all connectors and vacuum hoses. Remove all test equipment.

Fuel Injected Models

1. Set parking brake and block wheels. Disconnect automatic parking brake. Turn all accessories off. Place transmission in Drive (auto. trans.) or Neutral (man. trans.). Connect timing light to engine. Disconnect single in-line spout connector near distributor.
2. Start engine and warm to normal operating temperature. With engine at timing RPM, adjust timing. Turn off engine, disconnect timing light and reconnect single in-line spout connector.

IGNITION TIMING SPECIFICATIONS

HOT (SLOW) IDLE RPM

Note. Relocate air cleaner while making adjustments, but leave all hoses connected. Install air cleaner while making speed checks. Do not apply foot brake on hydro-boost systems as engine RPM will be affected during speed checks.

Scheme 3

1. Start engine and warm to normal operating temperature. Place transmission in "D". Place A/C heater selector in "OFF" position. Disconnect and plug vacuum hose at throttle kicker. Adjust curb idle using curb idle speed adjusting screw on throttle lever. (Scheme 3)
2. Place transmission in Neutral. Increase engine speed momentarily. Let engine return to idle and recheck curb idle speed. Apply a slight pressure on top of nylon nut located on accelerator pump to take up linkage clearance.
3. Turn nylon nut on accelerator pump rod clockwise until a.010 F.005 in. (.25 F.13 mm) clearance is obtained between top of accelerator pump and pump lever. Turn accelerator pump rod one turn counterclockwise to set lever lash preload. Remove plug from throttle kicker vacuum hose and reconnect.

Throttle Kicker Adjustment - Carbureted

1. Start engine and warm to normal operating temperature. Place transmission in "D". Place A/C heater selector in "OFF" position. Disconnect and plug vacuum hose at VOTM kicker. Connect a vacuum pump to VOTM and apply a minimum of 10 in. Hg to VOTM kicker.
2. Check/adjust VOTM idle speed. If adjustment is required, turn saddle bracket adjustment screw. (Scheme 3) Remove vacuum pump. Remove vacuum hose plug and connect vacuum hose to throttle kicker.

No idle adjustments are possible on fuel injected models.

CURB IDLE SPEED (RPM)

IDLE MIXTURE ADJUSTMENT

No idle mixture adjustment is possible 5.8L engines.

Scheme 4

1. Place transmission in Park. Start engine and warm to normal operating temperature. Disconnect and plug vacuum hose at EGR valve. Place fast idle screw on second step of fast idle cam and adjust fast idle RPM. (Scheme 4)
2. Increase engine speed momentarily. After engine has returned to idle, again place fast idle screw on specified step of fast idle cam. Recheck fast idle RPM. Reconnect vacuum line to EGR valve and remove test equipment.

No fast idle adjustments are possible on fuel injected models.

FAST IDLE SPEED

AUTOMATIC CHOKE

Note. No on-car choke adjustment is possible on 5.8L engines.

Check fuel pump volume and pressure with pump on engine, engine at idle RPM, and engine warmed to normal operating temperature.

Disconnect return line at fuel rail and connect hose to container. Connect pressure gauge at diagnostic fitting on throttle body. Disconnect wiring connector at fuel tank and apply 12 volts to pump with jumper wire.

FUEL PUMP SPECIFICATIONS

Distributors

On 5.0L models, the TFI-IV ignition system is used. On 5.8L Police models, the Dura Spark II with UIC (Universal Integrated Circuit) ignition system is used. No adjustments are required on either system.

IGNITION COIL RESISTANCE (OHMS)

FUEL SYSTEM

CARBURETOR

FUEL INJECTION

BATTERY

BATTERY SPECIFICATIONS

STARTER

Motorcraft positive engagement type.

STARTER SPECIFICATIONS @ 12 VOLTS

ALTERNATOR

ALTERNATOR SPECIFICATIONS

ALTERNATOR REGULATOR

Models using an external regulator use the Motorcraft Solid State Electronic Regulator, calibrated and preset by manufacturer. No adjustment is required or possible on this unit.

SERVICE INTERVALS

REPLACEMENT INTERVALS

BELT ADJUSTMENT

BELT ADJUSTMENT (1)

CAPACITIES

COOLING SYSTEM CAPACITIES

ENGINE OIL & FUEL CAPACITIES

TRANSMISSION & DIFFERENTIAL CAPACITIES

SYSTEM REFRIGERANT CAPACITIES