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 MANUALSPONTIAC1987GRAND PRIX LE, 5.0 HREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCRUISE CONTROL SYSTEMSTROUBLE SHOOTINGCRUISE SET SPEED HIGH OR LOW
1987 Pontiac Grand Prix LE, 5.0 H
Cruise Set Speed High Or Low
1987 Pontiac Grand Prix LE, 5.0 HSECTION Cruise Set Speed High Or Low
Check vacuum hoses for proper routing, restrictions or leaks. Adjust or repair as necessary. Check servo linkage for excess slack. If no system problem is found, replace the cruise control ECM.
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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.