Engine Controls - Service & Adjustment Specifications - 4.2L: Other

Engine Controls - Service & Adjustment Specifications - 4.2L: Other Chevrolet TrailBlazer I

Specifications 1 illustration ~173 words

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	215 (1482.4)
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

Engine is equipped with hydraulic lifters. Adjustment is not required.

HIGH TENSION WIRE RESISTANCE

Not equipped with high tension wires. Ignition coils are connected directly to spark plugs by boots.

SPARK PLUGS

Application	Type	Part No.
All Models	AC	41-965

SPARK PLUG TYPE

Application	Gap - In. (mm)	Torque - Ft. Lbs. (N.m)
All Models	.050 (1.27)	13 (18)

SPARK PLUG SPECIFICATIONS

Scheme 2

Scheme 2: FIRING ORDER

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	48-54 (334-378)

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 further testing procedures, perform TP sensor related diagnostic test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 4.2L BRAVADA, ENVOY, ENVOY XL & TRAILBLAZER article.

Application	(1) Voltage
All Models	1.0-5.0
(1) Voltage range is from idle to wide open throttle.

(1)	Voltage range is from idle to wide open throttle.

THROTTLE POSITION SENSOR VOLTAGE