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 (1) | |||
| 4-Cylinder | 10.0:1 | ||
| 6-Cylinder | |||
| 2.3L & 3.2L | 10.5:1 | ||
| 2.8L | 10.2:1 | ||
| V8 | 10.0:1 | ||
| Compression Pressure | |||
| All Models | 142-156 psi (10-11 kg/cm 2 ) | ||
| (1) Specification for V12 is not available. | |||
| (1) | Specification for V12 is not available. |
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 |
CRANKSHAFT (SPEED/POSITION PULSE) SENSOR RESISTANCE Ohms @ 68°F (20°C)
CYLINDER IDENTIFYING SENSOR
| Application | Ohms |
|---|---|
| All Models | 1150-1410 |
CYLINDER IDENTIFYING SENSOR RESISTANCE - Ohms @ 68°F (20°C)
IGNITION COIL
| Primary | Secondary |
|---|---|
| .8 (1) | Not Measurable |
| (1) Specification is approximate | |
| (1) | Specification is approximate |
IGNITION COIL RESISTANCE - Ohms @ 68°F (20°C)
SPARK PLUGS
| Application | Spark Plug |
|---|---|
| M3 | Bosch FGR8KQC |
| V12 | Bosch B4419 |
| All Others (Except E39 M62 From 7/97) | Bosch F7LDCR, NGK BKR6EK |
| E39 M62 From 7/97 | Bosch F8LDCR |
SPARK PLUG TYPE
| Application | Gap: In. (mm) | Torque: Ft. Lbs. (N.m) |
|---|---|---|
| Standard Engine | Not Adjustable | 23 (31) |
| Motorsport Engine | Not Adjustable | 17 (23) |
SPARK PLUG SPECIFICATIONS
FIRING ORDER & TIMING MARKS
Note. (Scheme 1)and (Scheme 3).
Firing Order
| Application | Firing Order |
|---|---|
| 4-Cylinder | 1 - 3 - 4 - 2 |
| 6-Cylinder | 1 - 5 - 3 - 6 - 2 - 4 |
| V8 | 1 - 5 - 4 - 8 - 6 - 3 - 7 - 2 |
| V12 | 1-7-5-11-3-9-6-12-2-8-4-10 |
| (1) Timing mark and cylinder order information is not available from manufacturer. | |
| (1) | Timing mark and cylinder order information is not available from manufacturer. |
FIRING ORDER (1)
Scheme 1
Scheme 2
Scheme 3
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) |
|---|---|---|
| 4-Cylinder | 43 (3) | 1.85 (0.9) |
| 6 & 8-Cylinder | 50 (3.5) | 1.85 (0.9) |
| 12-Cylinder | 50 (3.5) | 2.38 (1.13) |
FUEL PUMP PERFORMANCE
INJECTOR RESISTANCE
| Application | Ohms |
|---|---|
| All Models | 15-17 |
INJECTOR RESISTANCE - Ohms @ 68°F (20°C)
IDLE SPEED & MIXTURE
| Application | Idle RPM | (1) CO Level % |
|---|---|---|
| 4-Cylinder | 810-890 | .5-.7 |
| 6-Cylinder | 660-740 | .2-1.2 |
| V8 | 750-850 | .2-1.2 |
| V12 | 530-630 | — |
| (1) Measured at exhaust manifold. See ADJUSTMENTS article for additional information. | ||
| (1) | Measured at exhaust manifold. See ADJUSTMENTS article for additional information. |
IDLE SPEED & CO LEVEL
IDLE SPEED CONTROL (ISC) VALVE ( 1 )
| Application | Ohms | |
|---|---|---|
| 2-Terminal Connector | 15-25 | |
| 3-Terminal Connector | ||
| Terminals No. 1 & 2 | 15-25 | |
| Terminals No. 1 & 3 | 35-45 | |
ISC VALVE RESISTANCE - Ohms @ 68°F (20°C)
THROTTLE POSITION (TP) SENSOR
| Application | Specification | |
|---|---|---|
| 4-Cylinder | ||
| At Idle | 3200-4800 Ohms | |
| At Wide Open Throttle | 800-1200 Ohms | |
| 6-Cylinder | 4600 Ohms | |
| (1) Specifications shown are only specifications available. | ||
| (1) | Specifications shown are only specifications available. |
THROTTLE POSITION (TP) SENSOR SPECIFICATIONS (1)