ENGINE COMPRESSION
| Application | Specification |
|---|
| Compression Pressure (1) |
| 2.0L (2) | 142-171 psi (10.0-12.0 kg/cm 2 ) |
| 2.5L (2) | 156-185 psi (11.0-13.0 kg/cm 2 ) |
| 3.0L (2) | 185-213 psi (13.0-15.0 kg/cm 2 ) |
| (1) Maximum variation between cylinders is 7 psi (.5 kg/cm 2 ). (2) Engine cranking at 350 RPM with throttle open fully. |
| (1) | Maximum variation between cylinders is 7 psi (.5 kg/cm 2 ). |
| (2) | Engine cranking at 350 RPM with throttle open fully. |
COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
Note. Inspection and adjustment of valve clearance should be performed while engine is cold.
| Application | In. (mm) |
|---|
| 2.0L & 2.5L |
| Intake | 0.007-0.009 (0.18-0.22) |
| Exhaust | 0.010-0.011 (0.23-0.27) |
| 3.0L |
| Intake | 0.006-0.010 (0.14-0.23) |
| Exhaust | 0.008-0.012 (0.20-0.30) |
IGNITION COIL
Note. Ignition coil resistance is not measurable on Impreza 2.0L or Outback 3.0L. If vehicle does not start or ignition system failure is suspect, see BASIC DIAGNOSTIC PROCEDURES article.
| Application | (1) Primary | (2) Secondary |
|---|
| 2.5L | 0.73 Ohms ± 10% | 12.8 k/Ohms ± 15% |
| (1) Checked between ignition coil and ignitor assembly connector terminals No. 1 and No. 2 and terminals No. 2 and No. 4. (Scheme 2) (2) Check between ignition coil secondary terminals A and B, and terminals C and D. (Scheme 3) |
| (1) | Checked between ignition coil and ignitor assembly connector terminals No. 1 and No. 2 and terminals No. 2 and No. 4. (Scheme 2) |
| (2) | Check between ignition coil secondary terminals A and B, and terminals C and D. (Scheme 3) |
Scheme 2
Scheme 3
HIGH TENSION WIRE RESISTANCE
Note. Impreza 2.0L and Outback 3.0L use coil-on-plug system. No plug wires are used.
| Application | Ohms |
|---|
| No. 1 Spark Plug Cable | 5.6-10.6 |
| No. 2 Spark Plug Cable | 7.3-13.7 |
| No. 3 Spark Plug Cable | 5.9-11.1 |
| No. 4 Spark Plug Cable | 7.3-13.7 |
HIGH TENSION WIRE RESISTANCE - 2.5L
SPARK PLUGS
| Application | Champion | NGK |
|---|
| 2.0L | N/A | PFR6G |
| 2.5L | RC10YC4 | BKR5E-11 Or BKR6E-11 |
| 3.0L | N/A | PLFR6A-11 |
| Application | Gap - In. (mm) | (1) Torque - Ft. Lbs. (N.m) |
|---|
| 2.0L | 0.028-0.031 (0.7-0.8) | 15 (21) |
| 2.5L & 3.0L | 0.039-0.043 (1.0-1.1) | 15 (21) |
| (1) Torque should only be applied to new spark plugs without oil on the threads. In case threads are lubricated, torque should be reduced by approximately 1/3 of specified torque in order to avoid over stressing. |
| (1) | Torque should only be applied to new spark plugs without oil on the threads. In case threads are lubricated, torque should be reduced by approximately 1/3 of specified torque in order to avoid over stressing. |
SPARK PLUG SPECIFICATIONS
Firing Order
| Application | Firing Order |
|---|
| 2.0L & 2.5L | 1, 3, 2, 4 |
| 3.0L | 1, 6, 3, 2, 5, 4 |
Scheme 4
Scheme 4: 4-Cylinder Engine Configuration & Firing Order
Scheme 5
Scheme 5: 6-Cylinder Engine Configuration & Firing Order
Scheme 6
Scheme 6: Timing Marks (2.5L)
Timing Marks (2.0L & 3.0L)
Timing marks for 2.0L and 3.0L are not available from manufacturer.
IGNITION TIMING
| Application | (1) Auto. Trans. | (1) Man. Trans. |
|---|
| 2.0L | 12 @ 700 RPM | 12 @ 750 RPM |
| 2.5L | 15 @ 700 RPM | 10 @ 650 RPM |
| 3.0L (2) | 10 @ 600 RPM | (3) |
| (1) To improve stability, timing is controlled while engine is idling. Timing range is plus or minus 8 degrees (3 degrees on 2.0L). (2) Timing must be checked using a scan tool. (3) Manual transmission is not available with 3.0L engine. |
| (1) | To improve stability, timing is controlled while engine is idling. Timing range is plus or minus 8 degrees (3 degrees on 2.0L). |
| (2) | Timing must be checked using a scan tool. |
| (3) | Manual transmission is not available with 3.0L engine. |
IGNITION TIMING (DEGREES BTDC @ IDLE)
FUEL PUMP
| Application | Vacuum Line Connected psi (kg/cm 2 ) | Vacuum Line Disconnected psi (kg/cm 2 ) |
|---|
| All Models | (1) 30-34 (206-235) | (1) 41-46 (284-314) |
| (1) Fuel pressure readings will be 1-3 psi (0.1-0.2 kg/cm 2 ) higher at high altitudes. |
| (1) | Fuel pressure readings will be 1-3 psi (0.1-0.2 kg/cm 2 ) higher at high altitudes. |
INJECTOR RESISTANCE
| Application | Ohms |
|---|
| All Models | N/A |
INJECTOR RESISTANCE SPECIFICATIONS
IDLE SPEED
| Application | RPM |
|---|
| 2.0L |
| With A/C Off | 750 ± 100 |
| With A/C On |
| A/T | 825 ± 150 |
| M/T | 800 ± 150 |
| 2.5L |
| With A/C Off |
| A/T | 700 ± 100 |
| M/T | 650 ± 100 |
| With A/C On | 850 ± 100 |
| 3.0L |
| With A/C Off | 600 ± 50 |
| With A/C On | 700 ± 50 |
IDLE SPEED SPECIFICATIONS
FAST IDLE SPEED
Note. Fast idle speed is PCM controlled. Adjustment is not required.
THROTTLE POSITION (TP) SENSOR
Note. See ON-VEHICLE ADJUSTMENTS article for Throttle Position (TP) sensor adjustment procedure.
