2008 Saturn Astra L4-1.8LFACTORY OEM SERVICE PROCEDURE

Alignment: Testing and Inspection



Trim Height Inspection

Measuring P and R Heights

Factory service manual diagram




1. Use your hands to lift the front bumper approximately 38 mm (1.59 in).
2. Remove your hands and allow the vehicle to lower.
3. Use your hands to jounce the front of the vehicle downward approximately 38 mm (1.59 in).
4. Remove your hands and allow the vehicle to rise.
5. The dimension P for the left and right side of the vehicle is measured from the bottom lip of the wheel opening to the ground measured at the center line of the front wheel.
6. Compare the measurement to the specification table. Refer to Trim Height Specifications (Trim Height Specifications) .
7. If the measurement is outside of the specified range, replace the front springs. Refer to Strut, Strut Component, and Spring Replacement (Strut, Strut Component, and Spring Replacement) .
8. Use your hands to lift the rear bumper approximately 38 mm (1.59 in).
9. Remove your hands and allow the vehicle to lower.
10. Use your hands to jounce the rear of the vehicle downward approximately 38 mm (1.59 in).
11. The dimension R for the left and right side of the vehicle is measured from the bottom lip of the wheel opening to the ground measured at the center line of the rear wheel.
12. Compare the measurement to the specification table. Refer to Trim Height Specifications (Trim Height Specifications) .
13. If the measurement is outside of the specified range, replace the rear springs. Refer to Rear Spring Replacement (Rear Suspension Coil Spring) .


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:

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