ENGINE COMPRESSION
Check engine compression with engine at normal operating temperature at specified cranking speed, all spark plugs removed and throttle wide open.
| CAUTION | Depressurize fuel system before checking engine compression. |
| Application | Specification |
|---|---|
| Compression Ratio | 9.5:1 |
| Compression Pressure (1) | 160-170 psi (11.2-12.0 kg/cm 2 ) |
| Maximum Variation Between Cylinders | 10 psi (.70 kg/cm 2 ) |
| (1) Minimum cranking speed is 300 RPM. | |
| (1) | Minimum cranking speed is 300 RPM. |
COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
| Application | (1) In. (mm) |
|---|---|
| Intake & Exhaust | .012-.014 (.30-.36) |
| (1) Adjust valves with engine cold. | |
| (1) | Adjust valves with engine cold. |
VALVE CLEARANCE SPECIFICATIONS
IGNITION COIL
| Application | Primary | Secondary |
|---|---|---|
| XJS & XJ6 | 0.5 | 6000 |
IGNITION COIL RESISTANCE - OHMS @ 68°F (20°C)
HIGH TENSION WIRE RESISTANCE
| Application | Ohms |
|---|---|
| No. 1 Cylinder Wire | 5600-13,200 |
| No. 2 Cylinder Wire | 6000-14,000 |
| No. 3 Cylinder Wire | 6600-15,500 |
| No. 4 Cylinder Wire | 7700-18,200 |
| No. 5 Cylinder Wire | 9500-22,300 |
| No. 6 Cylinder Wire | 9100-21,400 |
| Ignition Coil Wire | 1800-4100 |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | Type |
|---|---|
| XJS & XJ6 | Champion No. RC9YC |
SPARK PLUG TYPE
| Application | Gap: In. (mm) | Torque: Ft. Lbs. (N.m) |
|---|---|---|
| XJS & XJ6 | .035 (.89) | 106-144 (12-16) |
SPARK PLUG SPECIFICATIONS
Firing Order & Distributor Rotation (4.0L 6-Cylinder). Scheme 1
IGNITION TIMING
Note. Ignition timing is electronically controlled and is not adjustable.
FUEL PUMP
| Application | Psi (kg/cm 2 ) |
|---|---|
| XJS & XJ6 | 43.5 (3.0) |
FUEL PUMP PERFORMANCE
INJECTOR RESISTANCE
Information is not available from manufacturer.
IDLE SPEED & MIXTURE
| Application | Idle RPM | % CO Level |
|---|---|---|
| XJS & XJ6 | 650-750 | 0.5 |
IDLE SPEED & CO LEVEL
FAST IDLE SPEED
Note. Fast idle speed is electronically controlled. No adjustment is necessary.
MASS AIRFLOW SENSOR
| Condition | Volts |
|---|---|
| Idle | 1.10-1.40 |
| Full Throttle | 3.0-3.3 |
| (1) Measure voltage between terminals No. 1 and 3. | |
| (1) | Measure voltage between terminals No. 1 and 3. |
MASS AIRFLOW SENSOR VOLTAGE (1)