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If you have a front wheel drive car the noise is most likely a upper strut mount/support.They will rattle and make a lot of noise but generally they are never a safety concern. Since you did not list much info, this is only a guess. I actually just had the R&R Manifold Gasket replaced. The noises started after the replacement...could this have anything to do with it? Also check the right side motor mount. To do this, get a small pry bar and pry up the motor mount about 1/4 to 1/2 inch then release it fast. If you duplicate the knocking noise, the mount is bad.

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15y ago
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Q: What would cause a knocking sound on the passenger side when going over a bumpy road or down an incline?
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