ENGINE COMPRESSION
Check engine compression with engine at normal operating temperature at specified cranking speed, all spark plugs removed and throttle wide open.
| CAUTION | Release fuel system pressure before checking engine compression. |
| Application | Specification |
|---|
| Compression Pressure | (1) |
| Maximum Variation Between Cylinders | 25% |
| (1) Information is not available from manufacturer. |
| (1) | Information is not available from manufacturer. |
COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
| Application | (1) In. (mm) |
|---|
| S-Type | (2) |
| XJR, XJ8, XKR & XK8 |
| Intake | .007-.009 (.18-.22) |
| Exhaust | .009-.011 (.22-.27) |
| (1) Adjust valves with engine cold. (2) Information is not available from manufacturer. |
| (1) | Adjust valves with engine cold. |
| (2) | Information is not available from manufacturer. |
VALVE CLEARANCE SPECIFICATIONS
SPARK PLUGS
| Application | Part No. |
|---|
| S-Type | (1) |
| XJR & XKR | NGK PFR6G-13E |
| XJ8 & XK8 | NGK PFR5G-11E |
| (1) Information is not available from manufacturer. |
| (1) | Information is not available from manufacturer. |
| Application | Gap In. (mm) | Torque Ft. Lbs. (N.m) |
|---|
| S-Type | (1) | (1) |
| XJR & XKR | .047-.051 (1.2-1.3) | 19-21 (25-29) |
| XJ8 & XK8 | .039-.043 (1.0-1.1) | 19-21 (25-29) |
| (1) Information is not available from manufacturer. |
| (1) | Information is not available from manufacturer. |
SPARK PLUG SPECIFICATIONS
Firing Order (V6). Scheme 1
Scheme 1: Firing Order (V6)
Firing Order (V8). Scheme 2
Scheme 2: Firing Order (V8)
IGNITION TIMING
Note. Ignition timing is electronically controlled. No adjustment is necessary.
FUEL PUMP
| Application | Pressure psi (kPa) |
|---|
| S-Type | (1) |
| XJR, XKR, XJ8 & XK8 | (2) |
| (1) Information is not available from manufacturer. (2) Regulated fuel pressure should be 43.5 psi (300 kPa) more than intake manifold pressure. |
| (1) | Information is not available from manufacturer. |
| (2) | Regulated fuel pressure should be 43.5 psi (300 kPa) more than intake manifold pressure. |
INJECTOR RESISTANCE
| Application | Resistance Ohms |
|---|
| S-Type | 12-16 |
| XJR, XKR, XJ8 & XK8 | 12-18 |
IDLE SPEED & MIXTURE
Note. Idle speed and mixture are electronically controlled. No adjustment is necessary.
FAST IDLE SPEED
Note. Fast idle speed is electronically controlled. No adjustment is necessary.
