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 MANUALSPONTIAC1989GRAND PRIX V6-191 3.1LREPAIR AND DIAGNOSISCRUISE CONTROLTESTING AND INSPECTIONTEST PROCEDURES
1989 Pontiac Grand Prix V6-191 3.1L
Test Procedures
1989 Pontiac Grand Prix V6-191 3.1LSECTION Test Procedures
Perform tests as described under SYSTEM DIAGNOSTIC CHART. If results are incorrect perform designated test.
NOTE: Do not press both the set switch and Resume/Accel position of cruise switch at same time with engine running. If quick checker displays a short light, release switches immediately.
When performing the following tests, refer to SCHEMATIC DIAGRAMS/ELECTRICAL AND ELECTRONIC DIAGRAMS/WIRING CIRCUITS.
For additional system diagnosis on 1989-90 Electra, Park Avenue and 1989-91 LeSabre, refer to TROUBLESHOOTING.
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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.