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 & Durango | 9.1:1 |
| Ram Pickup |
| 3.9L, 5.2L & 5.9L (Gasoline) | 9.1:1 |
| 5.9L (Diesel) | 17.5:1 |
| 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, 5.2L & 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 | (1) |
| 3.9L, 5.2L & 5.9L | 100 psi (7.0 kg/cm 2 ) |
| Durango | 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, 5.2L & 5.9L | (1) |
| Durango, 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 | .010 (.25) |
| Exhaust Valve | .020 (.51) |
| (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 & Grand Caravan |
| 2.4L |
| Diamond (1) (2) | .53-.65 | 11,500-13,500 |
| Weastec (1) | .45-.65 | 10,900-14,700 |
| 3.0L | (3) | (3) |
| 3.3L & 3.8L | .45-.65 | 7000-15,800 |
| Dakota & Durango |
| Diamond (1) (2) | .97-1.18 | 11,300-15,300 |
| Toyodenso (1) | .95-1.20 | 11,300-13,300 |
| Ram Pickup |
| Except 8.0L |
| Diamond (1) (2) | .97-1.18 | 11,300-15,300 |
| Toyodenso (1) | .95-1.20 | 11,300-13,300 |
| 8.0L | .53-.65 | 10,900-14,700 |
| Ram Van & Ram Wagon |
| Diamond (1) (2) | .97-1.18 | 11,300-15,300 |
| Toyodenso (1) | .95-1.20 | 11,300-13,300 |
| Town & Country | .45-.65 | 7000-15,800 |
| Voyager & Grand Voyager |
| 2.4L |
| Diamond (1) (2) | .53-.65 | 11,500-13,500 |
| Weastec (1) | .45-.65 | 10,900-14,700 |
| 3.0L | (3) | (3) |
| 3.3L | .45-.65 | 7000-15,800 |
| (1) This is the manufacturer of ignition coil. (2) Brass terminals. (3) Information is not available from manufacturer. |
| (1) | This is the manufacturer of ignition coil. |
| (3) | Information is not available from manufacturer. |
IGNITION COIL RESISTANCE - Ohms @ 70-80°F (21-27°C)
HIGH TENSION WIRE RESISTANCE
| Application | Ohms |
|---|
| Caravan & Grand Caravan (As Applicable) (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) |
| 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 & Grand Voyager (As Applicable) (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 & Grand Caravan |
| 2.4L | RC12YC5 |
| 3.0L | RN11YC4 |
| 3.3L & 3.8L | RN14PMP5 |
| Dakota |
| 2.5L | RC12ECC |
| 3.9L, 5.2L & 5.9L | RC12LC4 |
| Durango | RC12LC4 |
| Ram Pickup |
| 3.9L, 5.2L & 5.9L | RC12LC4 |
| 8.0L | QC9MC4 |
| Ram Van & Ram Wagon | RC12LC4 |
| Town & Country | RN14PMP5 |
| Voyager & Grand 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 & Grand Caravan |
| 2.4L | .048-.053 (1.22-1.35) | 20 (27) |
| 3.0L | .039-.044 (1.00-1.12) | 20 (27) |
| 3.3L & 3.8L | .048-.053 (1.22-1.35) | 20 (27) |
| Dakota |
| 2.5L | .035 (.89) | 30 (41) |
| 3.9L, 5.2L & 5.9L | .040 (1.01) | 30 (41) |
| Durango | .040 (1.01) | 30 (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 | .040 (1.01) | 30 (41) |
| Town & Country | .048-.053 (1.22-1.35) | 20 (27) |
| Voyager & Grand Voyager |
| 2.4L | .048-.053 (1.22-1.35) | 20 (27) |
| 3.0L | .039-.044 (1.00-1.12) | 20 (27) |
| 3.3L | .048-.053 (1.22-1.35) | 20 (27) |
| (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 2.4L 4-Cyl. (Caravan & Voyager). Scheme 1
Scheme 1: Firing Order 2.4L 4-Cyl. (Caravan & Voyager)
Firing Order & Distributor Rotation 2.5L 4-Cyl. (Dakota). Scheme 2
Scheme 2: Firing Order & Distributor Rotation 2.5L 4-Cyl. (Dakota)
Firing Order & Distributor Rotation 3.0L V6 (Caravan & Voyager). Scheme 3
Scheme 3: Firing Order & Distributor Rotation 3.0L V6 (Caravan & Voyager)
Firing Order 3.3L & 3.8L V6 (Caravan, Town & Country, & Voyager). Scheme 4
Scheme 4: Firing Order 3.3L & 3.8L V6 (Caravan, Town & Country, & Voyager)
Firing Order & Distributor Rotation 3.9L V6 (Dakota, Durango, Ram Pickup, Ram Van & Ram Wagon). Scheme 5
Scheme 5: Firing Order & Distributor Rotation 3.9L V6 (Dakota, Durango, Ram Pickup, Ram Van & Ram Wagon)
Firing Order & Distributor Rotation 5.2L & 5.9L Gasoline V8 (Dakota, Durango, Ram Pickup, Ram Van & Ram Wagon). Scheme 6
Scheme 6: Firing Order & Distributor Rotation 5.2L & 5.9L Gasoline V8 (Dakota, Durango, Ram Pickup, Ram Van & Ram Wagon)
Firing Order 5.9L Diesel 6-Cyl. (Ram Pickup). Scheme 7
Scheme 7: Firing Order 5.9L Diesel 6-Cyl. (Ram Pickup)
Firing Order 8.0L V10 (Ram Pickup). Scheme 8
Scheme 8: Firing Order 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 3.9L, 5.2L and 5.9L, Durango, Ram Pickup 3.9L, 5.2L and 5.9L (gasoline), Ram Van and Ram Wagon, the distributor can be checked for proper location. See FUEL SYSTEM SYNCHRONIZATION under FUEL SYSTEM in ON-VEHICLE ADJUSTMENTS.
FUEL PUMP (GASOLINE)
| Application | Pressure psi (kg/cm 2 ) | Min. Vol. In 7 Sec. Pts. (L) |
|---|
| Caravan |
| 2.4L & 3.0L | (1) 43-53 (3.0-3.7) | (2) |
| 3.3L |
| Flex-Fuel | (1) 50-60 (3.5-4.2) | (2) |
| Except Flex-Fuel | (1) 43-53 (3.0-3.7) | (2) |
| 3.8L | (1) 43-53 (3.0-3.7) | (2) |
| Dakota & Durango | (3) 44-54 (3.0-3.8) | .5 (24) |
| Ram Pickup, Ram Van & Ram Wagon | (3) 44-54 (3.0-3.8) | .5 (24) |
| Town & Country |
| 3.3L |
| Flex-Fuel | (1) 50-60 (3.5-4.2) | (2) |
| Except Flex-Fuel | (1) 43-53 (3.0-3.7) | (2) |
| 3.8L | (1) 43-53 (3.0-3.7) | (2) |
| Voyager |
| 2.4L & 3.0L | (1) 43-53 (3.0-3.7) | (2) |
| 3.3L |
| Flex-Fuel | (1) 50-60 (3.5-4.2) | (2) |
| Except Flex-Fuel | (1) 43-53 (3.0-3.7) | (2) |
| (1) Manufacturer lists fuel pressure with engine off, ignition on and using scan tool to activate fuel pump. (2) Information is not available from manufacturer. (3) Manufacturer lists fuel pressure with engine idling. |
| (1) | Manufacturer lists fuel pressure with engine off, ignition on and using scan tool to activate fuel pump. |
| (2) | Information is not available from manufacturer. |
| (3) | Manufacturer lists fuel pressure with engine idling. |
FUEL INJECTION PUMP & FUEL TRANSFER PUMP (DIESEL)
Note. For fuel injection pump timing, see ON-VEHICLE ADJUSTMENTS article.
| Application | Output Pressure psi (kg/cm 2 ) |
|---|
| Ram Pickup 5.9L | (1) |
| (1) Pressure testing procedure and output pressure is not available from manufacturer. |
| (1) | Pressure testing procedure and output pressure is not available from manufacturer. |
FUEL INJECTION PUMP PERFORMANCE (DIESEL)
Note. For testing of fuel transfer pump, see BASIC DIAGNOSTIC PROCEDURES article.
FUEL INJECTOR OPENING PRESSURE (DIESEL)
| Application | Psi (kg/cm 2 ) |
|---|
| Ram Pickup 5.9L | 4500 (316) |
FUEL INJECTOR OPENING PRESSURE (DIESEL)
FUEL INJECTOR RESISTANCE
| Application | Ohms @ 68°F (20°C) |
|---|
| All Models | 10-16 |
IDLE SPEED & MIXTURE
Note. On all except diesel models, idle speed and mixture are controlled by Powertrain Control Module (PCM). No adjustment is required.
| Application | RPM |
|---|
| Gasoline Models | (1) |
| Diesel Models | (2) |
| (1) Idle speed is controlled by Powertrain Control Module PCM) and idle air control motor. Idle speed is nonadjustable. (2) Idle speed is controlled by PCM. Idle speed is nonadjustable. |
| (1) | Idle speed is controlled by Powertrain Control Module PCM) and idle air control motor. Idle speed is nonadjustable. |
| (2) | Idle speed is controlled by PCM. Idle speed is nonadjustable. |
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 | (3) 500-900 |
| 3.9L, 5.2L & 5.9L | (3) 500-900 |
| Durango | (3) 500-900 |
| Ram Pickup |
| 3.9L, 5.2L & 5.9L (Gasoline) | (3) 500-900 |
| 8.0L | (4) |
| Ram Van & Ram Wagon | (3) 500-900 |
| Town & Country (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) Does not apply to this application. |
| (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) | Does not apply to this application. |
THROTTLE BODY MINIMUM AIRFLOW IDLE SPEED SPECIFICATIONS
THROTTLE POSITION SENSOR
| Throttle Opening | Volts |
|---|
| Caravan, Town & Country, & Voyager (1) (2) |
| At Idle | .38-1.20 |
| At Full Throttle | 3.10-4.40 |
| Dakota & Durango (1) (2) |
| At Idle | .26-.90 |
| At Full Throttle | Less Than 4.50 |
| Ram Pickup |
| 3.9L, 5.2L, 5.9L (Gasoline) & 8.0L (1) (2) |
| At Idle | .35-.90 |
| At Full Throttle | Less Than 4.50 |
| 5.9L (Diesel) | (3) |
| Ram Van & Ram Wagon (1) (2) |
| At Idle | .35-.90 |
| At Full Throttle | Less Than 4.50 |
| (1) Measure voltage at center terminal on throttle position sensor with ignition on. (2) Voltage should increase smoothly when moving throttle from idle to full throttle. (3) Diesel Accelerator Pedal Position Sensor (APPS) is not adjustable. Voltage should be less than one volt at idle and more than 3 volts at full throttle. |
| (1) | Measure voltage at center terminal on throttle position sensor with ignition on. |
| (2) | Voltage should increase smoothly when moving throttle from idle to full throttle. |
| (3) | Diesel Accelerator Pedal Position Sensor (APPS) is not adjustable. Voltage should be less than one volt at idle and more than 3 volts at full throttle. |
THROTTLE POSITION SENSOR VOLTAGE SPECIFICATIONS
