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 |
| 2.5L | 8.9:1 |
| 3.0L | 8.85:1 |
| 3.3L | 8.9:1 |
| 3.9L | 9.0:1 |
| 5.2L | 9.0:1 |
| 5.9L | 8.1:1 |
| Compression Pressure |
| 3.0L | (1) 178 psi (12.5 kg/cm 2 ) |
| All Other Engines | (2) 100 psi (7.0 kg/cm 2 ) |
| (1) At 250 RPM. (2) Minimum compression pressure is given. Maximum difference between each cylinder should not exceed 25 percent. |
| (2) | Minimum compression pressure is given. Maximum difference between each cylinder should not exceed 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 |
|---|
| 2.5L & 3.0L |
| Chrysler Prestolite | 1.34-1.55 | 9,400-11,700 |
| Diamond | 0.96-1.18 | 11,300-15,300 |
| Toyodenso | 0.95-1.20 | 11,300-13,300 |
| 3.3L |
| Diamond | 0.52-0.63 | 11,600-15,800 |
| Toyodenso | 0.51-0.61 | 11,500-13,500 |
| 3.9L, 5.2L & 5.9L |
| Chrysler Essex | 1.34-1.55 | 9,000-12,200 |
| Chrysler UTC | 1.34-1.55 | 9,000-12,200 |
| Diamond | 1.34-1.55 | 15,000-19,000 |
IGNITION COIL RESISTANCE (Ohms @ 70-80°F (21-27°C)
HIGH TENSION WIRE RESISTANCE
| Application | Minimum Ohms | Maximum Ohms |
|---|
| All Wires | 250 Per Inch | 1000 Per Inch |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | Champion No. |
|---|
| 2.5L | RN12YC |
| 3.0L |
| Standard | RN11YC4 |
| Optional | BPR5ES-II |
| 3.3L | RN16YC5 |
| 3.9L | RN12YC |
| 5.2L & 5.9L | RN12YC |
| Application | Gap In. (mm) | Torque Ft. Lbs. (N.m) |
|---|
| 2.5L | .036 (.91) | 20 (28) |
| 3.0L | .041 (1.00) | 20 (28) |
| 3.3L | .050 (1.27) | 20 (28) |
| 3.9L, 5.2L & 5.9L | .035 (.89) | 30 (41) |
SPARK PLUG SPECIFICATIONS
FIRING ORDER & TIMING MARKS
| WARNING | On 3.0L V6, the firing order and the spark plug connection order on the top of the distributor do not match. Circuits internal to the distributor cap differ from the external spark plug wire connections. This is intentional and is done to avoid spark plug wires crossover. (Scheme 2) |
Firing Order & Distributor Rotation (2.5L). Scheme 1
Scheme 1: Firing Order & Distributor Rotation (2.5L)
Firing Order & Distributor Rotation (3.0L). Scheme 2
Scheme 2: Firing Order & Distributor Rotation (3.0L)
Firing Order (3.3L). Scheme 3
Scheme 3: Firing Order (3.3L)
Firing Order & Distributor Rotation (3.9L). Scheme 4
Scheme 4: Firing Order & Distributor Rotation (3.9L)
Scheme 5
Scheme 5: Firing Order & Distributor Rotation (5.2L & 5.9L)
IGNITION TIMING
| Application | Man. Trans. | Auto. Trans. |
|---|
| 2.5L | 10-14 @ 850 | 10-14 @ 850 |
| 3.0L | N/A | 10-14 @ 700 |
| 3.3L | N/A | (1) 14-18 @ 750 |
| 3.9L, 5.2L & 5.9L | (2) 8-12 | (2) 8-12 |
| (1) Ignition timing is not adjustable. (2) At idle. |
| (1) | Ignition timing is not adjustable. |
IGNITION TIMING (Degrees BTDC @ RPM)
ELECTRONIC SPARK ADVANCE CHECK
Note. Always refer to Emissions 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 |
| 3.0L | N/A | 34-42 @ 2000 |
| 3.3L (1) |
| Federal | N/A | 24-32 @ 2000 |
| California | N/A | 33-41 @ 2000 |
| 3.9L, 5.2L & 5.9L | N/A | N/A |
| (1) Ignition timing is not adjustable. |
| (1) | Ignition timing is not adjustable. |
ELECTRONIC SPARK ADVANCE (Degrees BTDC @ RPM)
FUEL PUMP
Note. Fuel pump performance means fuel pressure and volume availability, not regulated fuel pressure.
| Application | Pressure psi (kg/cm 2 ) |
|---|
| 2.5L |
| Dakota | 14.5 (1.0) |
| Caravan & Voyager | 39 (2.7) |
| 3.0L & 3.3L | 48 (3.4) |
| 3.9L, 5.2L & 5.9L | 14.5 (1.0) |
IDLE SPEED & MIXTURE
Note. Mixture is controlled by Single Board Engine Controller (BEC). No adjustment is possible.
| Application | Man. Trans. | Auto. Trans. |
|---|
| 2.5L | 850 | 850 |
| 3.0L | N/A | 700 |
| 3.3L | N/A | 750 |
| 3.9L, 5.2L & 5.9L | N/A | N/A |
| Application | RPM |
|---|
| 2.5L | 1050-1250 |
MINIMUM AIRFLOW RATE SPECIFICATIONS - 4-CYLINDER
| Application | RPM |
|---|
| 3.0L | 750-950 |
| 3.3L & 3.9L | 700-950 |
MINIMUM AIRFLOW RATE SPECIFICATIONS - V6
THROTTLE POSITION SENSOR
| Terminals | Volts |
|---|
| At Idle | 1.5 |
| At Wide Open Throttle | 3.4 |
| (1) Measure voltage at throttle position sensor center terminal. |
| (1) | Measure voltage at throttle position sensor center terminal. |
THROTTLE POSITION SENSOR VOLTAGE TEST (1)
