Intermittent faults are so frustrating to troubleshoot. If you still have it out then lube up any moving/sliding interfaces.
What about the steering rod ends--is there grease under the dust boots, could one be dried out and knocking when it rotates?
Have you replaced the struts? The strut cylinder rotates about the rod (which is hard bolted to the chassis)--maybe the internals of the strut have worn a groove or notch that sometimes makes the noise.
A tuna can fits perfectly to cover the OEM strut mount to keep debris and water from filling the top cup. Mine was full of both and the threads and nut were getting rusty. The drivers side wiper has a drain that runs right into the cup--more great design "features".
What about the steering rod ends--is there grease under the dust boots, could one be dried out and knocking when it rotates?
Have you replaced the struts? The strut cylinder rotates about the rod (which is hard bolted to the chassis)--maybe the internals of the strut have worn a groove or notch that sometimes makes the noise.
A tuna can fits perfectly to cover the OEM strut mount to keep debris and water from filling the top cup. Mine was full of both and the threads and nut were getting rusty. The drivers side wiper has a drain that runs right into the cup--more great design "features".