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.
1985 Buick Skylark Custom, 2.8 W, StandardFACTORY OEM SERVICE PROCEDURE
Catalyst Replacement
- Raise vehicle on hoist. Attach vacuum aspirator device (J-25077) to exhaust pipe. See Fig 2 . Attach air supply to air hose fitting on vacuum pump. Apply enough air pressure (minimum 80 psi) to hold catalytic beads in place.
- Drive a small chisel between fill plug and converter housing, making sure not to damage housing. Continue driving small chisel into plug until plug is deformed enough to be removed with pliers.CAUTION: DO NOT pry plug from converter housing or damage to housing may result.
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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