* Wheel Bearing: A failing wheel bearing often makes a growling or rumbling noise that increases with speed (and thus acceleration). This is a common problem. Jack up the car, support it safely, and try spinning the wheel. If you feel roughness or hear noise, the bearing is suspect.
* CV Axle (Constant Velocity Axle): This is a strong possibility. CV axles transmit power from the transmission to the wheels. A failing CV axle often makes a clicking, popping, or grinding noise, especially under acceleration or when turning. A torn CV boot (the rubber covering the axle) will lead to grease leakage and ultimately axle failure. Inspect the boots for tears or damage.
* Brake Caliper: While less likely to only make noise under acceleration, a sticking or seized brake caliper can sometimes create a grinding or scraping noise, particularly if the caliper piston is sticking. Check the brakes for unusual wear and binding.
* Differential: Less likely but possible. A problem within the differential could manifest as a noise that increases with speed and engine load. This is usually a more consistent whine or hum rather than a sharp noise, though it could be accompanied by other symptoms.
Troubleshooting Steps:
1. Visual Inspection: Start with a thorough visual inspection of the driver's side wheel, tire, axle, and brake components. Look for anything obvious like loose parts, damaged components, leaking grease (from a CV boot), or worn brake pads.
2. Listen Carefully: Try to pinpoint the *exact* location of the noise. Is it coming from the wheel, closer to the transmission, or somewhere in between? This will help narrow down the possibilities.
3. Test Drive (Safely): Perform some test drives, paying close attention to when and how the noise changes. Does it change with speed, turning, or braking? Does it vary with how hard you accelerate?
4. Professional Inspection: If you can't identify the problem yourself, take your Caravan to a qualified mechanic for diagnosis. This is the safest and most efficient approach. They have the tools and expertise to properly diagnose and repair the issue. Don't drive the vehicle extensively if the noise is concerning, as further damage could occur.
Ignoring the noise could lead to more significant and costly repairs down the road. It's best to address it promptly.
