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 MANUALSBUICK1991CENTURY L4-151 2.5L VIN R TBIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTAPPLICATION AND IDENGINE SYSTEM IDENTIFICATION
1991 Buick Century L4-151 2.5L VIN R TBI
Engine System Identification
1991 Buick Century L4-151 2.5L VIN R TBISECTION Engine System Identification
Engine Vin Code ID [1] R
Engine 4cyl.-151"/2.5L
Fuel Control System Throttle Body Injection (TBI)
Ignition System Direct Ignition System W/Electronic Spark Timing (DIS/EST)
Computer System Computer Command Control (ECM)
Remarks:
[1] The eighth digit of the VIN denotes engine code.
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.