ENGINE COMPRESSION
| Application | Specification |
|---|
| Compression Ratio | 9.2:1 |
| Normal Compression Pressure | (1) |
| Minimum Compression Pressure | (1) |
| (1) Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 100 psi 7 kg/cm 2 ). |
| (1) | Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 100 psi 7 kg/cm 2 ). |
COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
| Application | In. (mm) |
|---|
| 4.3L | (1) |
| (1) Equipped with hydraulic lifters. Adjustment is not required. |
| (1) | Equipped with hydraulic lifters. Adjustment is not required. |
VALVE CLEARANCE SPECIFICATIONS
HIGH TENSION WIRE RESISTANCE
| Application | Ohms |
|---|
| 4.3L | 30,000 Maximum |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | Part No. |
|---|
| 4.3L | AC 41-932 |
| Application | Gap In. (mm) | Torque Ft. Lbs. (N.m) |
|---|
| 4.3L | .045 (1.14) | (1) 14 (20) |
| (1) Tighten spark plugs to 22 ft. lbs. (30 N.m) if using a NEW cylinder head. |
| (1) | Tighten spark plugs to 22 ft. lbs. (30 N.m) if using a NEW cylinder head. |
SPARK PLUG SPECIFICATIONS
Scheme 1
IGNITION TIMING
All models are equipped with an electronic computer-controlled ignition system. Timing on this system is not adjustable.
FUEL PUMP
| Application | Psi (kg/cm 2 ) |
|---|
| 4.3L | 60-66 (4.2-4.6) |
INJECTOR RESISTANCE
| Application | Ohms |
|---|
| 4.3L | (2) |
| (1) Injector resistance specification is at 50-95°F 10-35°C). (2) Resistance values are not available at time of publication. To check fuel injectors, perform injector test. See FUEL DELIVERY under FUEL SYSTEM in I - SYSTEM/COMPONENT TESTS article. |
| (1) | Injector resistance specification is at 50-95°F 10-35°C). |
| (2) | Resistance values are not available at time of publication. To check fuel injectors, perform injector test. See FUEL DELIVERY under FUEL SYSTEM in I - SYSTEM/COMPONENT TESTS article. |
INJECTOR RESISTANCE SPECIFICATIONS (1)
IDLE SPEED & MIXTURE
Idle mixture on fuel injected models is controlled by PCM and is not adjustable. Controlled idle speed and IAC count can be checked using scan tool. See CONTROLLED IDLE SPEED & IAC COUNT table. For controlled idle speed adjustment procedures, see ADJUSTMENTS article.
| Application | Idle RPM | IAC Counts |
|---|
| 4.3L | 650 | 18 |
CONTROLLED IDLE SPEED & IAC COUNT
THROTTLE POSITION (TP) SENSOR
| Application | Voltage |
|---|
| 4.3L | .47 |
| (1) Specification is with engine idling (throttle closed) at normal operating temperature. |
| (1) | Specification is with engine idling (throttle closed) at normal operating temperature. |
THROTTLE POSITION (TP) SENSOR VOLTAGE (1)
