TUNE-UP SERVICE PRECAUTIONS

- Tag or mark vacuum hoses before disconnecting them. After completing a job, double check that the vacuum hoses are properly connected.

- To disconnect vacuum hoses, pull on the end, not the middle of the hose.

- To pull apart electrical connectors, pull on the connector itself, not the wires.
- Before disconnecting pressurized fuel lines, always perform Fuel Pressure Release procedure in order to reduce the risk of fire and personal injury.
- When replacing fuel filters, always check all affected lines and fittings for leaks.
- Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion.

- To prevent serious burns:
- Avoid contact with hot metal parts.
- Do not remove the radiator cap when the engine is hot.

- Before servicing the vehicle:
- Protect fenders, upholstery and carpeting with appropriate covers.
- Take caution that keys, buckles, or buttons do not scratch paint.

- Do not operate the engine indoors without proper ventilation.
- Do not smoke while working on the vehicle.

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.

Safety Warning

Tune-up and Engine Performance Checks: Service Precautions

Use the Manual With the Right Hardware

When to See a Mechanic

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