Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1990 Oldsmobile Custom CruiserFACTORY OEM SERVICE PROCEDURE
Spark Plug Specifications: Notes
SPARK PLUG TYPE
| Application | AC |
|---|---|
| 4.5L (VIN 3) | R44LTS6 |
| 5.0L (VIN E & F) | R45TS |
| 5.0L (VIN Y) | FR3LS6 |
| 5.7L (VIN 7 & 8) | R45TS |
SPARK PLUG GAP & TORQUE SPECIFICATIONS
| Application | Gap - In. (mm) | Torque - Ft. Lbs. (N.m) |
|---|---|---|
| 4.5L (VIN 3) | .060 (1.52) | 11 (15) |
| 5.0L (VIN E & F) | .035 (0.89) | 22 (30) |
| 5.0L (VIN Y) | .060 (1.52) | 25 (34) |
| 5.7L (VIN 7 & 8) | .035 (0.89) | 22 (30) |
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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