* Suspension Components: A worn ball joint, tie rod end, or control arm bushing on the passenger side could be the culprit. These components are under stress during turning and maneuvering, and a popping sound often indicates wear or damage. Reverse puts a different kind of stress on them than forward driving.
* Steering Rack: While less likely, a problem with the steering rack, particularly a worn bushing or loose mounting bolt, could create a popping noise, especially during turning maneuvers.
* Brake Caliper: A sticking or binding brake caliper could create a popping sound under certain circumstances. However, this is less likely if the popping is only occurring when reversing.
* Something Hitting the Wheel Well: Check the wheel well area carefully for anything that might be rubbing or hitting the tire or suspension components as you reverse. This could be a loose component or debris.
What to do:
1. Visual Inspection: Carefully inspect the front passenger side suspension, steering components, and wheel well area. Look for anything loose, broken, or damaged. Pay close attention to the ball joints, tie rod ends, control arm bushings, and the steering rack. Jacking up the car will give you better access.
2. Test for Movement: Gently try to move the tire and suspension components (with the car jacked up and secured) to check for excessive play or looseness.
3. Professional Inspection: If you're uncomfortable performing a visual inspection or can't identify the problem, take your Grand Prix to a qualified mechanic for diagnosis and repair. Describing the sound and when it happens will help them pinpoint the issue.
Important Note: Driving with damaged suspension or steering components can be dangerous. If you suspect a serious problem, avoid driving the car until it's been inspected and repaired.
