ENGINE COMPRESSION
Ensure battery is fully charged. Warm engine to normal operating temperature. Disconnect wire at ignition coil to prevent engine from starting. Check engine compression with all spark plugs removed and throttle wide open.
| Application | Specification |
|---|
| Compression Ratio |
| Caravan |
| 2.4L | 9.4:1 |
| 3.0L | 8.9:1 |
| 3.3L | 8.9:1 |
| 3.8L | 9.6:1 |
| Dakota |
| 2.5L, 3.9L & 5.9L | 9.1:1 |
| 4.7L | 9.0:1 |
| Durango |
| 4.7L | 9.0:1 |
| 5.2L & 5.9L | 9.1:1 |
| Ram Pickup |
| 3.9L, 5.2L & 5.9L (Gasoline) | 9.1:1 |
| 5.9L (Diesel) | 16.5:1 |
| 8.0L | 8.4:1 |
| Ram Van & Ram Wagon | 9.1:1 |
| Town & Country |
| 3.3L | 8.9:1 |
| 3.8L | 9.6:1 |
| Voyager |
| 2.4L | 9.4:1 |
| 3.0L | 8.9:1 |
| 3.3L | 8.9:1 |
| Normal Compression Pressure |
| Caravan |
| 2.4L | 170-225 psi (11.9-15.7 kg/cm 2 ) |
| 3.0L | 178 psi (12.5 kg/cm 2 ) |
| 3.3L & 3.8L | (1) |
| Dakota |
| 2.5L | 120-150 psi (8.4-10.5 kg/cm 2 ) |
| 3.9L, 4.7L & 5.9L | (1) |
| Durango | (1) |
| Ram Pickup, Ram Van & Ram Wagon | (1) |
| Town & Country | (1) |
| Voyager |
| 2.4L | 170-225 psi (11.9-15.7 kg/cm 2 ) |
| 3.0L | 178 psi (12.5 kg/cm 2 ) |
| 3.3L | (1) |
| Minimum Compression Pressure |
| Caravan, Town & Country, & Voyager | 100 psi (7.0 kg/cm 2 ) |
| Dakota |
| 2.5L & 4.7L | (1) |
| 3.9L & 5.9L | 100 psi (7.0 kg/cm 2 ) |
| Durango |
| 4.7L | (1) |
| 5.2L & 5.9L | 100 psi (7.0 kg/cm 2 ) |
| Ram Pickup |
| 3.9L, 5.2L & 5.9L (Gasoline) & 8.0L | 100 psi (7.0 kg/cm 2 ) |
| 5.9L (Diesel) | (1) |
| Ram Van & Ram Wagon | 100 psi (7.0 kg/cm 2 ) |
| Maximum Variation Between Cylinders |
| Caravan, Town & Country & Voyager | 25 Percent |
| Dakota |
| 2.5L | 30 psi (2.1 kg/cm 2 ) |
| 3.9L, 4.7L & 5.9L | (1) |
| Durango | (1) |
| Ram Pickup, Ram Van & Ram Wagon | (1) |
| (1) Information is not available from manufacturer. |
| (1) | Information is not available from manufacturer. |
COMPRESSION SPECIFICATIONS
Gasoline Models
All engines are equipped with hydraulic lifters. No adjustments are required.
5.9L Diesel (Ram Pickup)
Valve adjustment is recommended every 150 months or 150,000 miles during normal service, every 135,000 miles during severe service. Severe service is described as frequent short trip operation of less than 5 miles, long periods of engine idling, trailer towing, police, taxi, local delivery service, or operating in dusty or excessively hot conditions. See VALVE CLEARANCE SPECIFICATIONS (DIESEL) table.
| Application | In. (mm) |
|---|
| Intake Valve | .006-.015 (.15-.38) |
| Exhaust Valve | .015-.030 (.38-.76) |
| (1) Adjust valves with engine temperature less than 140°F (60°C). |
| (1) | Adjust valves with engine temperature less than 140°F (60°C). |
VALVE CLEARANCE SPECIFICATIONS (DIESEL) (1)
IGNITION COIL
| Application | Primary | Secondary |
|---|
| Caravan |
| 2.4L |
| Diamond (Copper Towers) | .53-.65 | 11,500-13,500 |
| Weastec (Steel Towers) | .45-.65 | 10,900-14,700 |
| 3.0L | (1) | (1) |
| 3.3L & 3.8L | .45-.65 | 7000-15,800 |
| Dakota & Durango |
| 2.5L, 3.9L, 5.2L & 5.9L |
| Diamond (Copper Towers) | .97-1.18 | 11,300-15,300 |
| Toyodenso (Steel Towers) | .95-1.20 | 11,300-13,300 |
| 4.7L | .60-.90 | 6,000-9,000 |
| Ram Pickup |
| 3.9L, 5.2L & 5.9L |
| Diamond (Copper Towers) | .97-1.18 | 11,300-15,300 |
| Toyodenso (Steel Towers) | .95-1.20 | 11,300-13,300 |
| 8.0L | .53-.65 | 10,900-14,700 |
| Ram Van & Ram Wagon |
| Diamond (Copper Towers) | .97-1.18 | 11,300-15,300 |
| Toyodenso (Steel Towers) | .95-1.20 | 11,300-13,300 |
| Town & Country |
| 3.3L & 3.8L | .45-.65 | 7000-15,800 |
| Voyager |
| 2.4L |
| Diamond (Copper Towers) | .53-.65 | 11,500-13,500 |
| Weastec (Steel Towers) | .45-.65 | 10,900-14,700 |
| 3.0L | (1) | (1) |
| 3.3L | .45-.65 | 7000-15,800 |
| (1) Information is not available from manufacturer. |
| (1) | Information is not available from manufacturer. |
IGNITION COIL RESISTANCE - Ohms @ 70-80°F (21-27°C)
HIGH TENSION WIRE RESISTANCE
| Application | Ohms |
|---|
| Caravan (1) |
| 2.4L |
| Cylinder No. 1 Or 4 | 4200 |
| Cylinder No. 2 Or 3 | 3200 |
| 3.0L |
| Cylinder No. 1 | 14,000 |
| Cylinder No. 2 | 10,400 |
| Cylinder No. 3 | 14,900 |
| Cylinder No. 4 | 11,500 |
| Cylinder No. 5 | 17,500 |
| Cylinder No. 6 | 10,300 |
| Ignition Coil Wire | 11,100 |
| 3.3L & 3.8L |
| Cylinder No. 1 | 18,500 |
| Cylinder No. 2 | 15,500 |
| Cylinder No. 3 | 20,400 |
| Cylinder No. 4 | 21,200 |
| Cylinder No. 5 | 27,700 |
| Cylinder No. 6 | 26,700 |
| Dakota & Durango |
| All High Tension Wires | (2) |
| Ram Pickup, Ram Van & Ram Wagon |
| All High Tension Wires | (2) |
| Town & Country (1) |
| 3.3L & 3.8L |
| Cylinder No. 1 | 18,500 |
| Cylinder No. 2 | 15,500 |
| Cylinder No. 3 | 20,400 |
| Cylinder No. 4 | 21,200 |
| Cylinder No. 5 | 27,700 |
| Cylinder No. 6 | 26,700 |
| Voyager (1) |
| 2.4L |
| Cylinder No. 1 Or 4 | 4200 |
| Cylinder No. 2 Or 3 | 3200 |
| 3.0L |
| Cylinder No. 1 | 14,000 |
| Cylinder No. 2 | 10,400 |
| Cylinder No. 3 | 14,900 |
| Cylinder No. 4 | 11,500 |
| Cylinder No. 5 | 17,500 |
| Cylinder No. 6 | 10,300 |
| Ignition Coil Wire | 11,100 |
| 3.3L |
| Cylinder No. 1 | 18,500 |
| Cylinder No. 2 | 15,500 |
| Cylinder No. 3 | 20,400 |
| Cylinder No. 4 | 21,200 |
| Cylinder No. 5 | 27,700 |
| Cylinder No. 6 | 26,700 |
| (1) Maximum wire resistance is listed according to high tension wire application. For cylinder identification, see FIRING ORDER & TIMING MARKS . (2) Resistance should be 250-1000 ohms per one inch or 3000-12,000 ohms per 12 inches. |
| (1) | Maximum wire resistance is listed according to high tension wire application. For cylinder identification, see FIRING ORDER & TIMING MARKS . |
| (2) | Resistance should be 250-1000 ohms per one inch or 3000-12,000 ohms per 12 inches. |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | Champion No. |
|---|
| Caravan |
| 2.4L | RC12YC5 |
| 3.0L | RN11YC4 |
| 3.3L & 3.8L | RN14PMP5 |
| Dakota |
| 2.5L | RC12ECC |
| 3.9L, 5.2L & 5.9L | RC12LC4 |
| 4.7L | RC12MCC4 |
| Durango |
| 4.7L | RC12MCC4 |
| 5.2L & 5.9L | RC12LC4 |
| Ram Pickup |
| 3.9L, 5.2L & 5.9L | RC12LC4 |
| 8.0L | QC9MC4 |
| Ram Van & Ram Wagon |
| 3.9L, 5.2L & 5.9L | RC12LC4 |
| Town & Country |
| 3.3L & 3.8L | RN14PMP5 |
| Voyager |
| 2.4L | RC12YC5 |
| 3.0L | RN11YC4 |
| 3.3L | RN14PMP5 |
| (1) Check spark plug application on underhood vehicle emission control label. If application differs from application listed, use application on underhood vehicle emission control label. |
| (1) | Check spark plug application on underhood vehicle emission control label. If application differs from application listed, use application on underhood vehicle emission control label. |
| Application | Gap In. (mm) | Torque Ft. Lbs. (N.m) |
|---|
| Caravan |
| 2.4L | .048-.053 (1.22-1.35) | 21 (28) |
| 3.0L | .039-.044 (1.00-1.12) | 21 (28) |
| 3.3L & 3.8L | .048-.053 (1.22-1.35) | 21 (28) |
| Dakota |
| 2.5L | .035 (.89) | 26-30 (35-41) |
| 3.9L, 5.2L & 5.9L | .040 (1.01) | 26-30 (35-41) |
| 4.7L | .040 (1.01) | 20 (27) |
| Durango |
| 4.7L | .040 (1.01) | 20 (27) |
| 5.2L & 5.9L | .040 (1.01) | 26-30 (35-41) |
| Ram Pickup |
| 3.9L, 5.2L & 5.9L | .040 (1.01) | 30 (41) |
| 8.0L | .045 (1.14) | 30 (41) |
| Ram Van & Ram Wagon |
| 3.9L, 5.2L & 5.9L | .040 (1.01) | 30 (41) |
| Town & Country |
| 3.3L & 3.8L | .048-.053 (1.22-1.35) | 20 (27) |
| Voyager |
| 2.4L | .048-.053 (1.22-1.35) | 21 (28) |
| 3.0L | .039-.044 (1.00-1.12) | 21 (28) |
| 3.3L | .048-.053 (1.22-1.35) | 21 (28) |
| (1) Check spark plug gap specification on underhood vehicle emission control label. If specification differs from that listed above, use specification on underhood vehicle emission control label. |
| (1) | Check spark plug gap specification on underhood vehicle emission control label. If specification differs from that listed above, use specification on underhood vehicle emission control label. |
SPARK PLUG SPECIFICATIONS (1)
FIRING ORDER & TIMING MARKS
Scheme 1
Scheme 1: Firing Order & Coil Identification 2.4L 4-Cyl. (Caravan & Voyager)
Scheme 2
Scheme 2: Firing Order & Distributor Rotation 2.5L 4-Cyl. (Dakota)
Scheme 3
Scheme 3: Firing Order & Distributor Rotation 3.0L V6 (Caravan & Voyager)
Scheme 4
Scheme 4: Firing Order & Coil Identification 3.3L & 3.8L V6 (Caravan, Town & Country, & Voyager)
Scheme 5
Scheme 5: Firing Order & Distributor Rotation 3.9L V6 (Dakota, Durango, Ram Pickup, Ram Van & Ram Wagon)
Scheme 6
Scheme 6: Firing Order & Coil Identification 4.7L V8 (Dakota & Durango)
Scheme 7
Scheme 7: Firing Order & Distributor Rotation 5.2L & 5.9L Gasoline V8 (Dakota, Durango, Ram Pickup, Ram Van &
Scheme 8
Scheme 8: Firing Order 5.9L Diesel 6-Cyl. (Ram Pickup)
Scheme 9
Scheme 9: Firing Order & Coil Identification 8.0L V10 (Ram Pickup)
IGNITION TIMING
Note. On all models, ignition timing is controlled by Powertrain Control Module (PCM). Ignition timing is non-adjustable. DO NOT attempt to adjust ignition timing.
Note. On Dakota, Durango, Ram Pickup, Ram Van and Ram Wagon equipped with 3.9L, 5.2L and 5.9L (gasoline) engines, the distributor can be checked for proper position. See FUEL SYSTEM SYNCHRONIZATION under FUEL SYSTEM in ON-VEHICLE ADJUSTMENTS.
FUEL PUMP (GASOLINE)
| Application | Pressure psi (kg/cm 2 ) | (1) Min. Vol. In 7 Sec. Pts. (L) |
|---|
| Caravan |
| 2.4L & 3.0L | (2) 43-53 (3.0-3.7) | (3) |
| 3.3L |
| Flex-Fuel | (2) 50-60 (3.5-4.2) | (3) |
| Except Flex-Fuel | (2) 43-53 (3.0-3.7) | (3) |
| 3.8L | (2) 43-53 (3.0-3.7) | (3) |
| Dakota & Durango | (4) 44-54 (3.0-3.8) | .5 (.25) |
| Ram Pickup, Ram Van & Ram Wagon | (4) 44-54 (3.0-3.8) | .5 (.25) |
| Town & Country |
| 3.3L |
| Flex-Fuel | (2) 50-60 (3.5-4.2) | (3) |
| Except Flex-Fuel | (2) 43-53 (3.0-3.7) | (3) |
| 3.8L | (2) 43-53 (3.0-3.7) | (3) |
| Voyager |
| 2.4L & 3.0L | (2) 43-53 (3.0-3.7) | (3) |
| 3.3L |
| Flex-Fuel | (2) 50-60 (3.5-4.2) | (3) |
| Except Flex-Fuel | (2) 43-53 (3.0-3.7) | (3) |
| (1) DO NOT run fuel pump for longer than 7 seconds with fuel line disconnected, fuel module reservoir may run empty. (2) Manufacturer lists fuel pressure with engine off, ignition on and using scan tool to activate fuel pump. (3) Information is not available from manufacturer. (4) Manufacturer lists fuel pressure with engine idling. |
| (1) | DO NOT run fuel pump for longer than 7 seconds with fuel line disconnected, fuel module reservoir may run empty. |
| (2) | Manufacturer lists fuel pressure with engine off, ignition on and using scan tool to activate fuel pump. |
| (3) | Information is not available from manufacturer. |
| (4) | Manufacturer lists fuel pressure with engine idling. |
FUEL TRANSFER PUMP (DIESEL)
Note. For fuel injection pump timing, see ON-VEHICLE ADJUSTMENTS article.
| Application | Pressure psi (kg/cm 2 ) |
|---|
| 5.9L Diesel Fuel Transfer Pump (1) |
| Engine Cranking | Minimum 7 (.5) |
| Engine Running | Minimum 10 (.7) |
| (1) Fuel transfer pump is an electric fuel pump located on left side of engine block, above starter motor. |
| (1) | Fuel transfer pump is an electric fuel pump located on left side of engine block, above starter motor. |
FUEL TRANSFER PUMP PERFORMANCE (DIESEL)
Note. For testing of fuel transfer pump, see BASIC DIAGNOSTIC PROCEDURES article.
INJECTOR PRESSURES (DIESEL)
| Application | Psi (bar) |
|---|
| 5.9L Diesel |
| Injector Pop Off Pressure | 4250-4750 (293-328) |
| Injector Leak Down Pressure | 291 (20) Lower Than Pop Off Pressure |
INJECTOR PRESSURES (DIESEL)
INJECTOR RESISTANCE
| Application | Ohms @ 68°F (20°C) |
|---|
| Caravan, Town & Country & Voyager | 10-16 |
| Dakota, Durango, Ram Pickup, Ram Van & Ram Wagon | 10.8-13.2 |
IDLE SPEED & MIXTURE
Note. On gasoline engines, idle speed and mixture are controlled by Powertrain Control Module (PCM). Diesel engines are controlled by 2 different modules. Fuel and emissions are controlled by an Engine Control Module (ECM) located on left side of cylinder block. A/C, charging system, speed control and transmission are controlled by a Powertrain Control Module (PCM) located in right rear of engine compartment. No adjustment is necessary on gasoline or diesel engines.
| Application | RPM |
|---|
| Gasoline & Diesel Models | (1) |
| (1) Idle speed is not adjustable. |
| (1) | Idle speed is not adjustable. |
IDLE SPEED SPECIFICATIONS
THROTTLE BODY MINIMUM AIRFLOW IDLE SPEED
| Application | RPM |
|---|
| Caravan |
| 2.4L (1) |
| 1000 Miles Or Less | (2) 500-875 |
| More Than 1000 Miles | (2) 550-875 |
| 3.0L (1) |
| 1000 Miles Or Less | (2) 560-910 |
| More Than 1000 Miles | (2) 610-910 |
| 3.3L & 3.8L (1) |
| 1000 Miles Or Less | (2) 525-875 |
| More Than 1000 Miles | (2) 575-875 |
| Dakota |
| 2.5L | 500-900 |
| 3.9L, 5.2L & 5.9L | (3) 500-900 |
| 4.7L | (4) |
| Durango |
| 4.7L | (4) |
| 5.2L & 5.9L | (3) 500-900 |
| Ram Pickup |
| 3.9L, 5.2L & 5.9L (Gasoline) | (3) 500-900 |
| 8.0L | (4) |
| Ram Van & Ram Wagon |
| 3.9L, 5.2L & 5.9L | (3) 500-900 |
| Town & Country |
| 3.3L & 3.8L (1) |
| 1000 Miles Or Less | (2) 525-875 |
| More Than 1000 Miles | (2) 575-875 |
| Voyager |
| 2.4L (1) |
| 1000 Miles Or Less | (2) 500-875 |
| More Than 1000 Miles | (2) 550-875 |
| 3.0L (1) |
| 1000 Miles Or Less | (2) 560-910 |
| More Than 1000 Miles | (2) 610-910 |
| 3.3L (1) |
| 1000 Miles Or Less | (2) 525-875 |
| More Than 1000 Miles | (2) 575-875 |
| (1) Specification listed in accordance with vehicle mileage. (2) Specification listed with Air Metering Fitting (6457) installed. (3) Specification listed with Air Metering Fitting (6714) installed. (4) Information is not available. |
| (1) | Specification listed in accordance with vehicle mileage. |
| (2) | Specification listed with Air Metering Fitting (6457) installed. |
| (3) | Specification listed with Air Metering Fitting (6714) installed. |
| (4) | Information is not available. |
THROTTLE BODY MINIMUM AIRFLOW IDLE SPEED SPECIFICATIONS
THROTTLE POSITION SENSOR
| Throttle Opening | (1) Volts |
|---|
| Caravan, Town & Country, & Voyager (2) (3) |
| At Idle | .50 |
| At Full Throttle | 4.49 |
| Dakota & Durango (2) (3) |
| At Idle | .26 |
| At Full Throttle | 4.49 |
| Ram Pickup |
| 3.9L, 5.2L, 5.9L (Gasoline) & 8.0L (2) (3) |
| At Idle | .26 |
| At Full Throttle | 4.49 |
| 5.9L (Diesel) (4) |
| At Idle | Less Than One Volt |
| At Full Throttle | More Than 3 Volts |
| Ram Van & Ram Wagon (2) (3) |
| At Idle | .26 |
| At Full Throttle | 4.49 |
| (1) Specification is approximate and may vary slightly due to sensor and throttle body tolerances. (2) Measure voltage at center terminal on throttle position sensor with ignition on. (3) Voltage should increase smoothly when moving throttle from idle to full throttle. (4) Diesel Accelerator Pedal Position Sensor (APPS) is not adjustable. The APPS is calibrated and permanently positioned on a mounting bracket. |
| (1) | Specification is approximate and may vary slightly due to sensor and throttle body tolerances. |
| (2) | Measure voltage at center terminal on throttle position sensor with ignition on. |
| (3) | Voltage should increase smoothly when moving throttle from idle to full throttle. |
| (4) | Diesel Accelerator Pedal Position Sensor (APPS) is not adjustable. The APPS is calibrated and permanently positioned on a mounting bracket. |
THROTTLE POSITION SENSOR VOLTAGE SPECIFICATIONS
