BELT TENSION
Adjustment of serpentine belt is not necessary. Belt tension is maintained by spring-tensioned idler pulley (some equipped with belt wear indicator).
ENGINE COMPRESSION
| Application | Specification - psi (kPa) |
|---|---|
| Normal Compression Pressure | (1) |
| Minimum Compression Pressure | (1) |
| Compression Variance | (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 (689.5 kPa). (2) Information is not available from manufacturer. | |
| (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 (689.5 kPa). |
| (2) | Information is not available from manufacturer. |
ENGINE COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
Engines are equipped with hydraulic lifters. Adjustment is not required.
HIGH TENSION WIRE RESISTANCE
| Application | Ohms |
|---|---|
| All Models | 1000 Per Ft. |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | Type | Part No. |
|---|---|---|
| All Models | Denso | TJ14R-P15 |
SPARK PLUG TYPE
| Application | Gap - In. (mm) | Torque - Ft. Lbs. (N.m) |
|---|---|---|
| All Models | .060 (1.52) | 15 (20) |
SPARK PLUG SPECIFICATIONS
Scheme 6
IGNITION TIMING
All models are equipped with an electronic computer-controlled ignition system. Ignition timing is not adjustable.
FUEL PUMP
| Application | Psi (kPa) |
|---|---|
| All Models | 55-62 (379.2-427.5) |
FUEL PUMP PERFORMANCE
INJECTOR RESISTANCE
| Application | Ohms |
|---|---|
| All Models | 11-14 |
| (1) Injector resistance specification is at 50-95°F (10-35°C). | |
| (1) | Injector resistance specification is at 50-95°F (10-35°C). |
INJECTOR RESISTANCE SPECIFICATIONS (1)
IDLE SPEED & MIXTURE
Note. Idle mixture is controlled by Powertrain Control Module (PCM). Idle speed is preset by manufacturer and is not adjustable.
THROTTLE POSITION SENSOR
Note. Throttle Position (TP) sensor is not adjustable. For testing procedures, perform TP sensor related diagnostic test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 8.1L AVALANCHE, SIERRA, SILVERADO, SUBURBAN & YUKON XL article.
Note. Engine is also equipped with non-adjustable Accelerator Pedal Position (APP) sensor, mounted near the accelerator pedal. For testing procedures, perform APP sensor related diagnostic test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 8.1L AVALANCHE, SIERRA, SILVERADO, SUBURBAN & YUKON XL article.