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.
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HOMESERVICE MANUALSPONTIAC1984FIREBIRD BASE, 5.0 H, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMCATALYTIC CONVERTERSERVICE PROCEDURESCATALYST REPLACEMENT
1984 Pontiac Firebird Base, 5.0 H, Automatic
Catalyst Replacement
1984 Pontiac Firebird Base, 5.0 H, AutomaticSECTION 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.
- Clamp vibrator and catalytic container onto converter. See Fig 2 . Disconnect air supply from vacuum aspirator and attach it to vibrator unit. Allow vibrator to operate for about 10 minutes to remove all catalytic beads.
- When all catalytic material is removed, disconnect air supply and remove container from converter. Discard catalytic beads. Fill container with approved replacement catalytic beads. Install a fill tube fixture to vibrator device.
- Attach air supply to both vibrator and aspirator. With container attached to fill tube, catalytic beads will begin to move into converter.
- When catalytic beads stop flowing, disconnect air supply to vibrator and note level of beads. It should be even with fill plug. Add more beads if required.NOTE: If any beads exit through tailpipe during refilling of converter, converter is defective and must be replaced.
- Apply a anti-seize compound to fill plug. Install plug and tighten. If equipped with a press type fill plug, install a "bridge-and-bolt" type service plug and tighten to 28 ft. lbs. (38 N.m).
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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.