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 INSPECTIONTROUBLESHOOTING HINTS
1989 Pontiac Grand Prix V6-191 3.1L
Troubleshooting Hints
1989 Pontiac Grand Prix V6-191 3.1LSECTION Troubleshooting Hints
Servo Actuation Test:
1. Check vacuum hoses for leaks, kinks and/or restrictions.
2. Check cruise control servo linkage for proper slack.
3. If system works except for tap-up and tap-down functions, replace cruise control module, if equipped.
4. It is sometimes possible for the system to be electronically functional, yet the solenoids may not seat correctly or leak vacuum. This can result in intermittent or no function of the servo. Refer to Servo Actuation Test.
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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.