ENGINE COMPRESSION
Check engine compression with engine at normal operating temperature, all glow (diesel) or spark plugs (gasoline) removed (on dual plugs, remove exhaust side only), and throttle wide open. Ensure crankcase is full and oil is of correct viscosity. With compression gauge installed, use remote starter switch to crank engine.
Crank engine at least 5 revolutions, and record highest reading. Repeat procedure for all cylinders, using approximately same number of revolutions. Lowest compression reading should not be less than 75 percent of highest compression reading. No cylinder compression reading should be less than 100 psi (7 kg/cm 2 ).
VALVE CLEARANCE
Note. All models are equipped with hydraulic valve lifters; valve adjustment is not required. If valves are noisy or incorrect clearance is suspected, worn components are indicated. Check collapsed valve lifter clearance. See appropriate article in ENGINES.
HIGH TENSION WIRE RESISTANCE
| Application | Ohms |
|---|---|
| Except Villager | 7000 Per Foot |
| Villager | 9100 Per Foot |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
Note. If reusing originally installed spark plugs, reinstall them in original position. Some cylinders use platinum ground electrodes and some cylinders use platinum positive electrodes. Replacement platinum spark plugs are double platinum electrode spark plugs and are used for all cylinders.
SPARK PLUG TYPE (4-CYLINDER)
| Application | Motorcraft No. |
|---|---|
| 2.5L | AWSF-32F, Or AWSTF-32F |
SPARK PLUG TYPE (4-CYLINDER)
SPARK PLUG TYPE (V6)
| Application | Motorcraft No. | |
|---|---|---|
| 3.0L OHV | ||
| Ranger | (1) AWSF-32P/AWSF-32PG, Or (2) AGSF-32PP | |
| Ranger (Flex-Fuel) | AGSF-12PP | |
| Windstar | AWSF-32PP | |
| 3.3L | AGSP-32FP | |
| 3.8L | (1) AWSF-42EG/AWSF-42E, Or (2) AWSF-42EE | |
| 4.0L OHV & SOHC | ||
| Cylinders No. 1-3 | (1) AGRF-22PG Or (2) AGSF-22PP | |
| Cylinders No. 4-6 | (1) AGRF-22P Or (2) AGSF-22PP | |
| 4.2L | ||
| Cylinders No. 1-3 | (1) AWSF-32PG, Or (2) AGSF-34EE | |
| Cylinders No. 4-6 | (1) AWSF-32P, Or (2) AGSF-34EE | |
| (1) Original spark plug. (2) Service spark plug. | ||
| (1) | Original spark plug. |
| (2) | Service spark plug. |
SPARK PLUG TYPE (V6)
SPARK PLUG TYPE (V8)
| Application | Motorcraft No. | |
|---|---|---|
| 4.6L | ||
| Econoline | AWSF-32P | |
| Expedition | AWSF-22E, Or AWSF-32PP | |
| F150 | AWSF-12E, Or AWSF-32PP | |
| 5.0L | ||
| Cylinders No. 1-4 | (1) AGSF-32EG, Or (2) AWSF-32EE | |
| Cylinders No. 5-8 | (1) AGSF-32E, Or (2) AWSF-32EE | |
| 5.4L (2V) | ||
| Econoline (Except CNG), Expedition & F250/F350 Pickup | AWSF-22E | |
| Econoline & F150 Pickup (CNG) | (3) AWSF-22FM1, Or (4) AGSF-22FMI | |
| F150 Pickup (Lightning) | AGSF-12E, Or AGSF-12FMI | |
| F150 Pickup (Except Lightning) | AWSF-12E, Or AWSF-22E | |
| Navigator (4V) | AWSF-22E, Or AWSF-32P | |
| (1) Original spark plug. (2) Service spark plug. (3) Applies to vehicles with build dates before February, 1999. (4) Applies to vehicles with build dates from February, 1999 and up. | ||
| (1) | Original spark plug. |
| (2) | Service spark plug. |
| (3) | Applies to vehicles with build dates before February, 1999. |
| (4) | Applies to vehicles with build dates from February, 1999 and up. |
SPARK PLUG TYPE (V8)
SPARK PLUG TYPE (V10)
| Application | Motorcraft No. | |
|---|---|---|
| 6.8L | ||
| Econoline | AWSF-22E, Or AWSF-22W | |
| Excursion & Pickup | AWSF-22E | |
SPARK PLUG TYPE (V10)
FIRING ORDER & TIMING MARKS
Note. Use illustrations for firing order and timing marks. (Scheme 1)- (Scheme 21). Timing mark information is not available for all models.
Identifying Firing Order & Timing Marks (2.5L). Scheme 1
Scheme 2
Scheme 3
Scheme 4
Identifying Firing Order & Timing Marks (3.0L - VIN "U &V" & 4.0L - VIN "X"). Scheme 5
Scheme 6
Identifying Firing Order (3.3L). Scheme 7
Scheme 8
Scheme 9
Identifying Firing Order & Timing Marks (4.0L - VIN "E"). Scheme 10
Scheme 11
Identifying Firing Order & Timing Marks (4.2L). Scheme 12
Scheme 13
Identifying Firing Order & Timing Marks (4.6L With Light-Duty Emissions). Scheme 14
Scheme 15
Identifying Firing Order & Timing Marks (5.0L). Scheme 16
Scheme 17
Identifying Firing Order & Timing Marks (5.4L). Scheme 18
Scheme 19
Identifying Firing Order (6.8L). Scheme 20
Identifying Firing Order (7.3L Diesel). Scheme 21
IGNITION TIMING
Note. On all models with distributorless electronic ignition, manufacturer does not recommend checking ignition timing, as faulty readings are common and timing is not adjustable.
| Application | Degrees BTDC |
|---|---|
| Villager | 13-17 |
| All Others | 8-10 |
BASE IGNITION TIMING
FUEL PUMP
Note. For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS article.
IDLE SPEED & MIXTURE
Note. Idle mixture is not adjustable. For additional information, see SELF-DIAGNOSTICS - EEC-V article.
THROTTLE POSITION (TP) SENSOR
Note. Throttle Position (TP) sensor is not serviceable. If TP sensor service is required, see CIRCUIT TEST DH in SELF-DIAGNOSTICS - EEC-V article.
TP SENSOR OUTPUT (VILLAGER)
| Throttle Position | (1) Voltage |
|---|---|
| Closed | .4 |
| 1/4 | 1.3 |
| Half Open | 2.2 |
| 3/4 | 3.1 |
| Fully Open | 4.1 |
| (1) Values may vary by 15 percent. | |
| (1) | Values may vary by 15 percent. |
TP SENSOR OUTPUT (VILLAGER)
TP SENSOR OUTPUT (EXCEPT VILLAGER)
| Throttle Angle Degrees | (1) Volts | |
|---|---|---|
| Clockwise | ||
| 20 | 1.00 | |
| 40 | 2.00 | |
| 60 | 3.00 | |
| 80 | 3.80 | |
| 100 | 4.50 | |
| Counterclockwise | ||
| 0 | 1.00 | |
| 20 | 2.00 | |
| 40 | 3.00 | |
| 60 | 3.80 | |
| 80 | 4.65 | |
| (1) Throttle position may vary by 6 percent. For testing, refer to TEST DH in SELF - DIAGNOSTICS - EEC-V article. | ||
| (1) | Throttle position may vary by 6 percent. For testing, refer to TEST DH in SELF - DIAGNOSTICS - EEC-V article. |
TP SENSOR OUTPUT (EXCEPT VILLAGER)