2004 Chevrolet Optra Base, StandardFACTORY OEM SERVICE PROCEDURE

Fastener Tightening Specifications

Application Specification
Metric English
Camshaft Position Sensor Bolts 8 N.m 71 lb in
Crankshaft Position Sensor Retaining Bolt 8 N.m 71 lb in
Electronic Ignition System Ignition Coil Retaining Bolts 10 N.m 89 lb in
Engine Coolant Temperature Sensor 20 N.m 15 lb ft
Evaporative Emission Canister Flange Bolt 4 N.m 35 lb in
Evaporative Emission Canister Protective Cover 8 N.m 71 lb in
Evaporative Emission Canister Purge Solenoid Bracket Bolt 5 N.m 44 lb in
Fuel Filter Mounting Bracket Assembly Bolt 4 N.m 35 lb in
Fuel Rail Retaining Bolts 25 N.m 18 lb ft
Fuel Tank Retaining Bolts 20 N.m 15 lb ft
Idle Air Control Valve Retaining Bolts 3 N.m 27 lb in
Knock Sensor Bolt 20 N.m 15 lb ft
Manifold Absolute Pressure Sensor Bolt 4 N.m 35 lb in
Oxygen Sensor 42 N.m 31 lb ft
Throttle Body Retaining Nuts 10 N.m 89 lb in
Throttle Position Sensor Retaining Bolts 2 N.m 18 lb ft
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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