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 MANUALSCADILLAC1991SEVILLE STSREPAIR AND DIAGNOSISENGINE PERFORMANCEREMOVE, OVERHAUL & INSTALLENGINE CONTROLS - REMOVE/INSTALL/OVERHAULFUEL SYSTEM (TBI)THROTTLE BODYREMOVAL
1991 Cadillac Seville STS
Throttle Body: Removal
1991 Cadillac Seville STSSECTION Removal
- Relieve fuel pressure. See FUEL PRESSURE RELIEF (TBI) under FUEL SYSTEM (TBI). Disconnect negative battery cable. Remove air cleaner and related ducting.
- Remove electrical connectors from Idle Air Control (IAC), TPS and fuel injector(s). Lay wiring harness aside. Remove throttle cable, return springs, transmission/transaxle cable, and cruise control cable (if equipped). Label and remove vacuum hoses.
- Remove fuel feed and return lines. Use 2 wrenches to prevent nuts in throttle body from coming loose. Remove fuel line "O" rings and discard. Remove throttle body retaining bolts. Remove TBI unit and base gasket. Discard base gasket.
WARNING:
Pressure regulator spring is under heavy tension, and can cause injury if released. DO NOT
immerse cover in any type of cleaning solvent.
RENDER: 1.0x
NO RELATED
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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.