ENGINE COMPRESSION
Check engine compression with engine at normal operating temperature at specified cranking speed, all spark plugs removed and throttle wide open. The DME master relay and/or fuel pump relay MUST be pulled out for compression test. See ADJUSTMENTS article for additional information.
| Application | Specification |
|---|
| Compression Ratio | 10.5:1 |
| Compression Pressure | 142-156 psi (10-11 kg/cm 2 ) |
COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
Note. All engines use hydraulic valve lifters. Valve adjustment is not required.
CRANKSHAFT (SPEED/POSITION PULSE) SENSOR
| Application | Ohms |
|---|
| All Models | 70-90 |
| (1) Ohms @ 68°F (20°C) |
CRANKSHAFT (SPEED/POSITION PULSE) SENSOR RESISTANCE (1)
CYLINDER IDENTIFYING SENSOR
| Application | Ohms |
|---|
| All Models | 1150-1410 |
CYLINDER IDENTIFYING SENSOR RESISTANCE - Ohms @ 68°F (20°C)
IGNITION COIL
| Application | Primary | Secondary |
|---|
| All Models | .82 | (1) |
| (1) Secondary coil resistance cannot be measured. |
| (1) | Secondary coil resistance cannot be measured. |
IGNITION COIL RESISTANCE - Ohms @ 68°F (20°C)
HIGH TENSION WIRE RESISTANCE
| Application | Resistance |
|---|
| All Models | (1) 20 Ohms Per Foot |
| (1) Add resistance of wire to resistance of each connector to find total resistance of spark plug wire. |
| (1) | Add resistance of wire to resistance of each connector to find total resistance of spark plug wire. |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | Bosch | NGK |
|---|
| All Models | F7LDCR | BKR6EK |
| Application | Gap In. (mm) | Torque Ft. Lbs. (N.m) |
|---|
| All Models | (1) | 15-22 (20-30) |
| (1) Spark plug gap is not adjustable. |
| (1) | Spark plug gap is not adjustable. |
SPARK PLUG SPECIFICATIONS
FIRING ORDER & TIMING MARKS
| Application | Firing Order |
|---|
| 6-Cylinder | 1-5-3-6-2-4 |
| (1) Timing mark and cylinder order information is not available from manufacturer. |
| (1) | Timing mark and cylinder order information is not available from manufacturer. |
IGNITION TIMING
Ignition timing is electronically controlled and is not adjustable.
Note. Timing specifications are not available from the manufacturer.
FUEL PUMP
Note. Fuel pump performance is a measurement of fuel pressure and volume availability, not regulated fuel pressure.
| Application | Pressure psi (kg/cm 2 ) | Min. Vol. In 30 Sec. Pts. (L) |
|---|
| All Models | 43 (3) | 1.85 (0.9) |
INJECTOR RESISTANCE
| Application | Ohms |
|---|
| All Models (1) | 15-17 |
| (1) Injector group resistance should be 5-6 ohms. |
| (1) | Injector group resistance should be 5-6 ohms. |
INJECTOR RESISTANCE - Ohms @ 68°F (20°C)
IDLE SPEED & MIXTURE
| Application | Idle RPM | (1) CO Level % |
|---|
| 325i, 325iC & 325is | 660-740 | .2-1.2 |
| 525i & 525iT | 660-740 | .2-1.2 |
| (1) Measured at exhaust manifold. See ADJUSTMENTS article for additional information. |
| (1) | Measured at exhaust manifold. See ADJUSTMENTS article for additional information. |
IDLE SPEED CONTROL (ISC) MOTOR
| Application | Ohms |
|---|
| 325i, 325iC & 325is | 18-25 |
| 525i & 525iT | 18-25 |
ISC MOTOR RESISTANCE - Ohms @ 68°F (20°C)
THROTTLE POSITION (TP) SENSOR
| Application | Specification |
|---|
| 325i/325iC, 325is/ 525i & 525iT "R" Total | 4600 Ohms |
THROTTLE POSITION (TP) SENSOR SPECIFICATIONS
