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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1567 (ENGINE MECHANICAL - 4.3L)REPAIR INSTRUCTIONSON-VEHICLE REPAIR INSTRUCTIONSENGINE REPLACEMENTINSTALLATION PROCEDURE

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Install the engine.
NOTE: Refer to FASTENER NOTICE .
Install the engine mount to engine mount bracket bolts.
Tighten

Tighten the bolts to 65 N.m (48 lb ft).

Fig 1: Engine Mount To Engine Mount Bracket Bolts
Courtesy of GENERAL MOTORS CORP.
Remove the lifting devise and the J 41427
Apply threadlock GM P/N 12345382, (Canadian P/N 10953489), or equivalent to the threads of the intake manifold lower bolts.
Install the intake manifold bolts.
Tighten
1. 5.1. Tighten the bolts a first pass to 3 N.m (27 lb in).
2. 5.2. Tighten the bolts a second pass to 12 N.m (106 lb in).
3. 5.3. Tighten the bolts a final pass to 15 N.m (11 lb ft).
Install one transmission bolt until snug.
Remove the support jack from under the transmission.
Install the thermostat and water outlet. Refer to THERMOSTAT REPLACEMENT (4.3L ENGINE)

Fig 2: J 41427 (Engine Lift Brackets)
Courtesy of GENERAL MOTORS CORP.
Slide the P/S pump bracket onto the stud.
Install the bolts and the nut for the P/S pump bracket.
Install the P/S pump rear bracket front nut.
Tighten the P/S pump rear bracket nut.
Tighten

Tighten the bolts and nuts to 41 N.m (30 lb ft).

Fig 3: Power Steering Pump Bracket, Nut & Bolts
Courtesy of GENERAL MOTORS CORP.
Connect the power brake booster vacuum hose to the vacuum fitting.

Fig 4: Power Brake Booster Vacuum Hose & Vacuum Fitting
Courtesy of GENERAL MOTORS CORP.
Connect the EVAP canister harness to the purge solenoid valve.
Install the distributor cap. Refer to DISTRIBUTOR .
Install the heater hoses. Refer to HEATER HOSE REPLACEMENT-INLET (LU3) and HEATER HOSE REPLACEMENT-OUTLET (LU3) .

Fig 5: EVAP Canister Harness & Purge Solenoid Valve
Courtesy of GENERAL MOTORS CORP.
Position the engine wiring harness.
Install the stud holding the engine wiring harness bracket.
Install the engine wiring harness rear bracket nut at the EVAP canister purge solenoid valve.
Tighten

Tighten the nut to 9 N.m (80 lb in).

Fig 6: Engine Wiring Harness Rear Bracket & Nut
Courtesy of GENERAL MOTORS CORP.
Position the bracket and wiring harness.
Install the junction block bracket bolt.
Tighten

Tighten the bolt to 25 N.m (18 lb ft).

Fig 7: Junction Block Bracket Bolt
Courtesy of GENERAL MOTORS CORP.
Install the engine wiring harness bracket to the studs.
Install the engine wiring harness bracket nuts.
Tighten

Tighten the nuts to 12 N.m (106 lb in).

Fig 8: Engine Wiring Harness Bracket & Nuts
Courtesy of GENERAL MOTORS CORP.
Position the harness ground (4) and ground strap (5).
Install the harness ground bolt.
Tighten

Tighten the bolt to 16 N.m (12 lb ft).
Connect the following electrical connectors:
- Knock sensor (1)
- CMP sensor (2)
- Fuel pump/oil pressure sensor (3)
- Distributor (2)
  
  Fig 9: Electrical Connectors, Harness Ground & Ground Strap
  Courtesy of GENERAL MOTORS CORP.
Install the engine wiring harness ground nut and ground wire (4) to the rear of the right cylinder head.
Tighten

Tighten the nut to 16 N.m (12 lb ft).
Connect the following electrical connectors:
- Ignition coil (1)
- Ignition coil driver (2)
- Generator (3)
Fig 10: Ground Wire, Ignition Coil, Ignition Coil Drive & Generator Electrical Connectors
Courtesy of GENERAL MOTORS CORP.
Connect the following electrical connectors:
- EVAP canister purge solenoid valve (1)
- MAP sensor (2)
Fig 11: EVAP Canister Purge Solenoid Valve & MAP Sensor Electrical Connectors
Courtesy of GENERAL MOTORS CORP.
Install the engine wiring harness clip bolt (4).
Tighten

Tighten the bolt to 9 N.m (80 lb in).
Connect the following electrical connectors:
- TP sensor (1)
- IAC motor (2)
- Control port injector module (3)
- ECT sensor (5)
Fig 12: Electrical Connectors & Wiring Harness Clip Bolt
Courtesy of GENERAL MOTORS CORP.
Install the positive cable and nut to the generator.
Tighten

Tighten the nut to 18 N.m (13 lb ft).
Connect the following electrical connectors:
- A/C pressure switch (4), if equipped
- A/C compressor clutch (1), if equipped
If equipped, install the A/C hoses.

Fig 13: A/C Pressure Switch & A/C Compressor Clutch Electrical Connectors
Courtesy of GENERAL MOTORS CORP.
Position the bracket and cables.
Install the accelerator control cable bracket with the cables attached, to the throttle body.
Install the accelerator control cable bracket nuts.
Tighten

Tighten the nuts to 9 N.m (80 lb in).

Fig 14: Accelerator Control Cable Bracket, Cables & Nuts
Courtesy of GENERAL MOTORS CORP.
Install the accelerator cable to the throttle body lever.

Fig 15: Accelerator Cable & Throttle Body Lever
Courtesy of GENERAL MOTORS CORP.