ENGINE COMPRESSION
Check engine compression with engine at normal operating temperature, all spark plugs removed and throttle wide open.
| Application | Specification |
|---|---|
| Compression Ratio | 9.4:1 |
| Normal Compression Pressure | (1) |
| Minimum Compression Pressure | (1) |
| (1) Lowest compression reading should not be less than 70% 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% 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 |
|---|---|
| 3.8L | 30,000 Maximum |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | AC Spark Plug |
|---|---|
| 3.8L | 41-921 |
SPARK PLUG TYPE
| Application | Gap In. (mm) | Torque Ft. Lbs. (N.m) |
|---|---|---|
| 3.8L | .060 (1.52) | 11 (15) |
SPARK PLUG SPECIFICATIONS
FIRING ORDER
Note. For firing order, see appropriate illustration. (Scheme 1)
Firing Order (Except "F" Body). Scheme 1
Firing Order ("F" Body). Scheme 2
IGNITION TIMING
Note. All engines are equipped with an electronic computer-controlled ignition system. Timing on these systems is not adjustable.
FUEL PUMP
| Application | Pressure - psi (kg/cm 2 ) |
|---|---|
| 3.8L | 48-55 (3.37-3.87) |
FUEL PUMP PERFORMANCE
INJECTOR RESISTANCE
| Application | Ohms |
|---|---|
| 3.8L | (1) 11.4-12.6 |
| (1) Injector resistance specification is at 50-95°F (10-35°C). | |
| (1) | Injector resistance specification is at 50-95°F (10-35°C). |
INJECTOR RESISTANCE SPECIFICATIONS
IDLE SPEED & MIXTURE
Note. Idle mixture is controlled by Powertrain Control Module (PCM). Adjustment is neither required nor possible.
THROTTLE POSITION (TP) SENSOR
Note. TP sensor is not adjustable. For further testing procedures, refer to the TESTS W/CODES - 3.8L article or see the SYSTEM/COMPONENT TESTS - 3.8L article.
| Application | (1) Volts |
|---|---|
| 3.8L | (2) (3) |
| (1) Voltage range is from idle position to wide open throttle position. (2) TP sensor is not adjustable. (3) Voltage range is less than one volt at closed throttle to greater than 4 volts at wide open throttle. | |
| (1) | Voltage range is from idle position to wide open throttle position. |
| (2) | TP sensor is not adjustable. |
| (3) | Voltage range is less than one volt at closed throttle to greater than 4 volts at wide open throttle. |
TP SENSOR ADJUSTMENT VOLTAGE