Possible Causes:
* Wheel Bearing: This is a common cause of tapping noises, especially when cornering or at higher speeds. The noise often changes pitch with speed.
* Brake Components: Worn brake pads, a sticking caliper, or a damaged rotor can all produce tapping sounds. You might also notice unusual brake performance.
* Suspension Components: Worn ball joints, control arm bushings, or tie rod ends can cause tapping, often more noticeable over bumps.
* Exhaust System: A loose heat shield or a hole in the exhaust pipe can create tapping sounds, especially when the engine is running.
* Engine Related (less likely for a consistent tap): While less likely to be a constant tap, a lifter, valve, or other internal engine component could be the culprit. This is more likely to be a rhythmic sound that changes with engine speed.
To Help Diagnose the Problem:
1. When does the tapping occur? Constantly? Only when driving? Only when turning? Only over bumps? Only when braking? The timing is crucial.
2. Does the tapping change with speed? If it gets faster as you accelerate, it suggests a wheel bearing or something rotating with the wheel.
3. Does the tapping change with steering input? Turning left or right might pinpoint suspension issues on one side.
4. Check under the car: Look for anything obviously loose or damaged, like parts of the exhaust system or suspension components.
5. Listen carefully: Try to pinpoint the location of the sound as precisely as possible (e.g., near the wheel, under the car, near the engine).
Next Steps:
* Take it to a mechanic: The best way to diagnose the tapping sound is to have a qualified mechanic inspect your Cadillac. They have the tools and experience to pinpoint the problem accurately.
* DIY (if you're mechanically inclined): If you're comfortable working on cars, you could try investigating the wheel bearings and brakes yourself. However, improper repair could worsen the problem.
Without more details, it's impossible to give a definitive answer. Providing more information about when the tapping occurs will significantly help in narrowing down the possibilities.
