* Exhaust System: Loose heat shields, a cracked exhaust pipe, or a failing catalytic converter are common culprits. A rattling or tapping sound, especially when accelerating or decelerating, is a strong indicator. Check underneath the car for any obvious damage or looseness.
* Suspension: Worn-out bushings, ball joints (though less likely in the rear), or shocks/struts can create tapping noises, especially over bumps or uneven surfaces. Inspect the suspension components for any visible damage, excessive play, or leaks.
* Brakes: Worn brake pads can sometimes make a tapping noise as the pad metallic wear indicators scrape against the rotor. Check your brake pads' thickness. Also, a loose brake caliper or other component could be the source.
* Loose Items in the Trunk: The simplest explanation might be something loose rattling around in your trunk. Check for anything that could be hitting the sides or floor.
* Differential: While less common, problems with the differential (the gear assembly that distributes power to the rear wheels) can sometimes produce tapping or clicking noises. This is more likely to be accompanied by other symptoms, such as vibrations or difficulty shifting.
* Fuel System: Though less probable, a loose fuel line or component could potentially make noise.
What to do:
1. Reproduce the noise: Try to pinpoint when the tapping occurs (acceleration, deceleration, turning, going over bumps). This will help narrow down the possibilities.
2. Visual Inspection: Carefully inspect the rear of the vehicle, looking at the exhaust, suspension, and brake system.
3. Listen Carefully: Try to isolate the location of the noise as precisely as possible. Have someone else drive while you listen from different positions around the car.
4. Test Drive: If possible, have someone who is familiar with car mechanics accompany you on a test drive to help diagnose the problem.
5. Professional Inspection: If you can't identify the source of the noise, take your Cougar to a qualified mechanic for diagnosis and repair. This is the safest and most reliable option.
Don't ignore the noise. Ignoring a tapping sound could lead to more serious and expensive problems down the road.
