ENGINE COMPRESSION
Check engine compression with engine at normal operating temperature at specified cranking speed, all spark plugs removed and throttle wide open.
| Application | Specification |
|---|
| Compression Ratio | 8.9:1 |
| Minimum Compression Pressure | 100 psi (690 kPa) at 130 RPM |
| Maximum Compression Variation Between Cylinders | 25 Percent |
COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
All engines are equipped with hydraulic lifters and do not require valve adjustment. Valve clearance is zero lash with engine at operating temperature.
IGNITION COIL
| Application | Primary | Secondary |
|---|
| Diamond | 0.95-1.20 | 8500-15,300 |
| Toyodenso | 0.95-1.20 | 8500-13,300 |
IGNITION COIL RESISTANCE- Ohms @ 70-80°F (21-27°C)
HIGH TENSION WIRE RESISTANCE
| Application | Ohms |
|---|
| All Wires | 250-1000 Per Inch |
| All Wires | 3000-12,000 Per Foot |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | Plug No. | Gap - In. (mm) |
|---|
| 2.5L | (1) (2) RN12YC | .035 (.89) |
| (1) Tighten to 20 ft. lbs. (27 N.m) (2) Champion spark plug part number. |
| (1) | Tighten to 20 ft. lbs. (27 N.m) |
| (2) | Champion spark plug part number. |
Firing Order & Distributor Rotation (2.5L). Scheme 1
Scheme 1: Firing Order & Distributor Rotation (2.5L)
IGNITION TIMING
Note. Always refer to Emission Control Label in engine compartment before attempting service. If manual and label differ, always use emission label specifications.
| Application | (1) Degrees BTDC |
|---|
| Caravan & Voyager | 10-14 |
| Dakota | (2) |
| (1) At idle. (2) See emission control information label in engine compartment. |
| (2) | See emission control information label in engine compartment. |
ELECTRONIC SPARK ADVANCE CHECK
Note. Always refer to Emission Control Label in engine compartment before attempting service. If manual and label differ, always use emission label specifications.
| Application | Man. Trans. | Auto. Trans. |
|---|
| 2.5L | 17-25 @ 2000 | 17-25 @ 2000 |
ELECTRONIC SPARK ADVANCE (Degrees BTDC @ RPM)
FUEL PUMP
| Application | Pressure - psi (kPa) |
|---|
| Caravan & Voyager | 39 (269) |
| Dakota | 13.5-15.5 (93-107) |
| (1) Fuel pressure taken at engine idle (no load). |
| (1) | Fuel pressure taken at engine idle (no load). |
FUEL PUMP REGULATED PRESSURE (1)
IDLE SPEED
Note. Mixture is controlled by Powertrain Control Module (PCM). No adjustment is possible.
| Application | Man. Trans. | Auto. Trans. |
|---|
| 2.5L | 1050-1250 | 1050-1250 |
| Application | RPM |
|---|
| Caravan & Voyager | 800-1200 |
| Dakota | 1050-1250 |
THROTTLE BODY MINIMUM AIRFLOW IDLE SPECIFICATIONS
THROTTLE POSITION SENSOR
| Throttle Opening (2) | Volts |
|---|
| Idle | 0.5 |
| WOT | 4.0 |
| (1) Voltage should increase steadily as throttle opening is increased from idle position. (2) Measure voltage at throttle position sensor center terminal. |
| (1) | Voltage should increase steadily as throttle opening is increased from idle position. |
| (2) | Measure voltage at throttle position sensor center terminal. |
THROTTLE POSITION SENSOR VOLTAGE TEST (1)
