ENGINE COMPRESSION
Check engine compression with engine at normal operating temperature, all spark plugs removed and throttle wide open.
| Application | Specification | ||
|---|---|---|---|
| Compression Ratio | |||
| 2.3L | |||
| VIN A | 10.0:1 | ||
| VIN D & 3 | 9.5:1 | ||
| 3.1L | |||
| VIN M | 9.5:1 | ||
| Normal Compression Pressure | (1) | ||
| Minimum Compression Pressure | (1) | ||
| (1) Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 100 psi (7 kg/cm 2 ). | |||
| (1) | Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 100 psi (7 kg/cm 2 ). |
COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
Note. All models are equipped with hydraulic lifters. Adjustment is not required.
HIGH TENSION WIRE RESISTANCE
| Application | Ohms |
|---|---|
| 2.3L & 3.1L | 30,000 Maximum |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | AC Spark Plug | |
|---|---|---|
| 2.3L | ||
| VINs A & D (M/T) | 41-602 | |
| VINs D (A/T) & 3 | 41-603 | |
| 3.1L | R44LTSM | |
SPARK PLUG TYPE
| Application | Gap: In. (mm) | Torque: Ft. Lbs. (N.m) |
|---|---|---|
| 2.3L | .035 (0.89) | 16 (22) |
| 3.1L | .045 (1.14) | 11 (15) |
SPARK PLUG SPECIFICATIONS
Firing Order (2.3L). Scheme 1
Firing Order (3.1L). Scheme 2
IGNITION TIMING
Note. For timing procedures, see ADJUSTMENTS article in the ENGINE PERFORMANCE section.
| Application | M/T | A/T |
|---|---|---|
| 2.3L & 3.1L | (1) | (1) |
| (1) Not adjustable. | ||
| (1) | Not adjustable. |
IGNITION TIMING (Degrees BTDC @ RPM)
FUEL PUMP
| Application | Pressure: psi (kg/cm 2 ) |
|---|---|
| 2.3L, 3.1L | 41-47 (2.88-3.30) |
FUEL PUMP PERFORMANCE
INJECTOR RESISTANCE
| Application | Ohms |
|---|---|
| 2.3L | 1.9-2.1 |
| 3.1L | 11.8-12.6 |
| (1) Injector resistance specification is at 140°F (60°C). | |
| (1) | Injector resistance specification is at 140°F (60°C). |
INJECTOR RESISTANCE SPECIFICATIONS (1)
IDLE SPEED & MIXTURE
Note. Idle mixture is controlled by Engine Control Module (ECM) or Powertrain Control Module (PCM). Idle mixture adjustment is neither required nor possible.
THROTTLE POSITION (TP) SENSOR
Note. For further testing, see TESTS W/CODES - 3.1L and TESTS W/CODES - 2.3L articles in the ENGINE PERFORMANCE section.
| Application | (1) Volts |
|---|---|
| 2.3L | (2) .60-4.80 |
| 3.1L | (2) .50-4.80 |
| (1) Voltage range is from idle position to wide open throttle position. (2) TP sensor is not adjustable. | |
| (1) | Voltage range is from idle position to wide open throttle position. |
| (2) | TP sensor is not adjustable. |
TP SENSOR ADJUSTMENT VOLTAGE