ENGINE COMPRESSION
Check engine compression with engine at normal operating temperature at specified cranking speed, all spark plugs removed and throttle wide open.
| Application (1) | Specification |
|---|
| Compression Ratio |
| 3.0L (VIN J) | 10.0:1 |
| 3.0L (VIN K) | 8.0:1 |
| 3.0L (VIN H) | 10.0:1 |
| Compression Pressure |
| 3.0L (VIN J) | 185 psi (13.0 kg/cm 2 ) |
| 3.0L (VIN K) | 156 psi (10.9 kg/cm 2 ) |
| 3.0L (VIN H) | 171 psi (12.0 kg/cm 2 ) |
| Maximum Variation Between Cylinders | 14 psi (1.0 kg/cm 2 ) |
| (1) See A- ENGINE/VIN ID article in this section for VIN information. |
| (1) | See A- ENGINE/VIN ID article in this section for VIN information. |
COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
Note. Valve adjustment is not required on these models.
IGNITION COIL
| Application | Primary | Secondary |
|---|
| 3.0L (VIN J & K) | .67-.81 | 11,310-15,300 |
| 3.0L (VIN H) | .72-.88 | 10,300-13,900 |
IGNITION COIL RESISTANCE - Ohms @ 68°F (20°C)
HIGH TENSION WIRE RESISTANCE - 3.0L (VIN J & K)
| Application (1) | Ohms |
|---|
| Coil Wire | Not Used |
| No. 1 Wire | 8600 |
| No. 2 Wire | 13,900 |
| No. 3 Wire | 6400 |
| No. 4 Wire | 11,500 |
| No. 5 Wire | 4500 |
| No. 6 Wire | 11,780 |
| (1) See ENGINE/VIN ID article in this section for VIN information. |
| (1) | See ENGINE/VIN ID article in this section for VIN information. |
HIGH TENSION WIRE RESISTANCE - 3.0L (VIN J & K)
HIGH TENSION WIRE RESISTANCE - 3.0L (VIN H)
| Application (1) | Ohms |
|---|
| Coil Wire | (2) |
| No. 1 Wire | 7800 |
| No. 2 Wire | 6400 |
| No. 3 Wire | 9600 |
| No. 4 Wire | 7500 |
| No. 5 Wire | 10,400 |
| No. 6 Wire | 8600 |
| (1) See ENGINE/VIN ID article in this section for VIN information. (2) Information is not available from manufacturer. |
| (1) | See ENGINE/VIN ID article in this section for VIN information. |
| (2) | Information is not available from manufacturer. |
HIGH TENSION WIRE RESISTANCE - 3.0L (VIN H)
SPARK PLUGS
| Application | Nippondenso No. |
|---|
| 3.0L (VIN J & K) | PK20PR-P11 |
| 3.0L (VIN H) | W20EPR-11 |
| Application | Gap In. (mm) | Torque Ft. Lbs. (N.m) |
|---|
| All Others | .039-.043 (1.0-1.1) | 15-21 (20-30) |
SPARK PLUG SPECIFICATIONS
FIRING ORDER
| WARNING | On many models, improper arrangement of spark plug wires will cause miss firing and surge during high-speed operation. Ensure spark plug wires are routed as shown. |
Scheme 1
Scheme 1: Firing Order & Plug Wire Routing (Diamante 3.0L SOHC)
Scheme 2
Scheme 2: Firing Order & Plug Wire Routing (Diamante 3.0L DOHC)
Scheme 3
Scheme 3: Firing Order & Plug Wire Routing (3000GT & Stealth 3.0L DOHC)
IGNITION TIMING
| Application | (1) Basic | (2) (3) Actual |
|---|
| Diamante | 3-7 @ 600-800 | 15 @ 600-800 |
| Stealth & 3000GT | 2-8 @ 600-800 | 15 @ 600-800 |
| (1) With ignition timing adjustment connector grounded or vacuum hose (farthest from distributor) disconnected. (2) With ignition timing adjustment connector ungrounded or vacuum hose (farthest from distributor) connected. Ignition timing may fluctuate. (3) If vehicle altitude is more than 2300 ft. above sea level, actual timing may be advanced. |
| (1) | With ignition timing adjustment connector grounded or vacuum hose (farthest from distributor) disconnected. |
| (2) | With ignition timing adjustment connector ungrounded or vacuum hose (farthest from distributor) connected. Ignition timing may fluctuate. |
| (3) | If vehicle altitude is more than 2300 ft. above sea level, actual timing may be advanced. |
IGNITION TIMING (Degrees BTDC @ RPM)
FUEL PUMP
| Application | At Idle W/ Vacuum psi (kg/cm 2 ) | At Idle W/O Vacuum psi (kg/cm 2 ) |
|---|
| Stealth (Turbo) & 3000GT | 34 (2.4) | 43-45 (3.0-3.1) |
| All Others | 38 (2.6) | 47-50 (3.3-3.5) |
INJECTOR RESISTANCE
| Application | Ohms |
|---|
| Non-Turbo | 13-16 |
| Turbo | 2-3 |
THROTTLE POSITION SENSOR (TPS)
| Application | (1) Volts |
|---|
| Diamante (With Traction Control) | .58-.69 |
| All Others | .4-1.0 |
| (1) At idle. |
