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 DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEAPPLICATIONENGINE/VIN IDMODEL COVERAGE & IDENTIFICATION
1991 Cadillac Seville STS
Model Coverage & Identification
1991 Cadillac Seville STSSECTION Model Coverage & Identification
NOTE:
The Engine code is stamped on the engine block. Refer to ENGINE CODE LOCATION at the end of this table for specific locations of the engine codes.
IDENTIFICATION
| MODEL | BODY | ENGINE (1) | ENGINE ID | FUEL SYSTEM | IGNITION SYSTEM | ||
|---|---|---|---|---|---|---|---|
| Beretta | L | 2.2L (LM3) | G | TBI | DIS Magnetic | ||
| . | L | 2.3L (LG0) | A | PFI | IDI Magnetic | ||
| . | L | 3.1L (LH0) | T | PFI | DIS Magnetic | ||
| Bonneville | H | 3.8L (LN3) | C | SFI | C3I Hall Effect | ||
| Brougham | D | 5.0L (LO3) | E | TBI | HEI Magnetic | ||
| . | D | 5.7L (LO5) | 7 | TBI | HEI Magnetic | ||
| Camaro | F | 3.1L (LH0) | T | PFI | HEI Magnetic | ||
| . | F | 5.0L (LB9) | F | PFI | HEI Magnetic | ||
| . | F | 5.0L (LO3) | E | TBI | HEI Magnetic | ||
| . | F | 5.7L (L98) | 8 | PFI | HEI Magnetic | ||
| Caprice | B | 4.3L (LB4) | Z | TBI | Magnetic | ||
| . | B | 5.0L (LO3) | E | TBI | HEI Magnetic | ||
| . | B | 5.7L (LO5) | 7 | TBI | HEI Magnetic | ||
| Cavalier | J | 2.2L (LM3) | G | TBI | DIS Magnetic | ||
| . | J | 3.1L (LH0) | T | PFI | DIS Magnetic | ||
| Century | A | 2.5L (LR8) | R | TBI | DIS Magnetic | ||
| . | A | 3.3L (LG7) | N | PFI | C3I Hall Effect | ||
| Corsica | L | 2.2L (LM3) | G | TBI | DIS Magnetic | ||
| . | L | 3.1L (LH0) | T | PFI | DIS Magnetic | ||
| Corvette | Y | 5.7L (L98) | 8 | PFI | HEI Magnetic | ||
| Custom Cruiser | B | 5.0L (LO3) | E | TBI | HEI Magnetic | ||
| Cutlass Calais | N | 2.3L (LG0) | A | PFI | IDI Magnetic | ||
| . | N | 2.3L (LD2) | D | PFI | IDI Magnetic | ||
| . | N | 2.5L (L68) | U | TBI | C3I Hall Effect | ||
| . | N | 3.3L (LG7) | N | PFI | C3I Hall Effect | ||
| Cutlass Ciera | A | 2.5L (LR8) | R | TBI | DIS Magnetic | ||
| . | A | 3.3L (LG7) | N | PFI | C3I Hall Effect | ||
| Cutlass Cruiser Wagon | A | 2.5L (LR8) | R | TBI | DIS Magnetic | ||
| . | A | 3.3L (LG7) | N | PFI | C3I Hall Effect | ||
| Cutlass Supreme | W | 2.3L (LD2) | D | PFI | IDI Magnetic | ||
| . | W | 3.1L (LH0) | T | PFI | DIS Magnetic | ||
| . | W | 3.4L (LQ1) | X | PFI | DIS Magnetic | ||
| Delta 88 | H | 3.8L (LN3) | C | SFI | C3I Hall Effect | ||
| DeVille | C | 4.9L (L26) | B | SFI | HEI Magnetic W/ Hall effect Camshaft Sensor | ||
| Eldorado | E | 4.9L (L26) | B | SFI | HEI Magnetic W/ Hall effect Camshaft Sensor | ||
| Firebird | F | 3.1L (LH0) | T | PFI | HEI Magnetic | ||
| . | F | 5.0L (LB9) | F | PFI | HEI Magnetic | ||
| . | F | 5.0L (LO3) | E | TBI | HEI Magnetic | ||
| . | F | 5.7L (L98) | 8 | PFI | HEI Magnetic | ||
| Fleetwood | C | 4.9L (L26) | B | SFI | HEI Magnetic W/ Hall effect Camshaft Sensor | ||
| Grand Am | N | 2.3L (LG0) | A | PFI | IDI Magnetic | ||
| . | N | 2.3L (LD2) | D | PFI | IDI Magnetic | ||
| . | N | 2.5L (L68) | U | TBI | DIS Magnetic | ||
| Grand Prix | W | 2.3L (LD2) | D | PFI | IDI Magnetic | ||
| . | W | 3.1L (LH0) | T | PFI | DIS Magnetic | ||
| . | W | 3.4L (LQ1) | X | PFI | DIS Magnetic | ||
| LeSabre | H | 3.8L (LN3) | C | SFI | C3I Hall Effect | ||
| Lumina | W | 2.5L (LR8) | R | TBI | DIS Magnetic | ||
| . | W | 3.1L (LH0) | T | PFI | DIS Magnetic | ||
| . | W | 3.4L (LQ1) | X | PFI | DIS Magnetic | ||
| Ninety-Eight | C | 3.8L (L27) | L | SFI | C3I Hall Effect | ||
| Park Avenue | C | 3.8L (L27) | L | SFI | C3I Hall Effect | ||
| Reatta | E | 3.8L (LN3) | C | SFI | Hall Effect | ||
| Riviera | E | 3.8L (LN3) | C | SFI | Hall Effect | ||
| Regal | W | 3.1L (LH0) | T | PFI | Magnetic | ||
| . | W | 3.8L (L27) | L | SFI | C3I Hall Effect | ||
| Roadmaster | B | 5.0L (LO3) | E | TBI | HEI Magnetic | ||
| Seville | K | 4.9L (L26) | B | SFI | HEI Magnetic W/ Hall effect Camshaft Sensor | ||
| Skylark | N | 2.3L (LD2) | D | PFI | IDI Magnetic | ||
| . | N | 2.5L (L68) | U | TBI | DIS Magnetic | ||
| . | N | 3.3L (LG7) | N | PFI | C3I Hall Effect | ||
| Sunbird | J | 2.0L (LT2) | K | TBI | HEI Magnetic | ||
| . | J | 3.1L (LH0) | T | PFI | DIS Magnetic | ||
| Toronado | E | 3.8L (LN3) | C | SFI | C3I Hall Effect | ||
| Touring Sedan | C | 3.8L (L27) | L | SFI | C3I Hall Effect | ||
| Trofeo | E | 3.8L (LN3) | C | SFI | C3I Hall Effect | ||
| 6000 | A | 2.5L (LR8) | R | TBI | DIS Magnetic | ||
| . | A | 3.1L (LH0) | T | PFI | DIS Magnetic | ||
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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.