the suspension is brand new with tenzo springs.
but rear passenger supsension keeps having the knocking sound whenever the civic goes over a bump at a higher speed (lest say over 10 mph)
the bushing is new.the shocks is new and the spring is new.and i have the lower and upper strut bars..

 

what kind of car? sounds like a rear sway bar link

 

its a eg hatch

 

i have the same problem... i think it might be because of the stiffer spring rates and poly R-LCA hardened bushings.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by crazyguy &raquo;</TD></TR><TR><TD CLASS="quote">the suspension is brand new with tenzo springs.
but rear passenger supsension keeps having the knocking sound whenever the civic goes over a bump at a higher speed (lest say over 10 mph)
the bushing is new.the shocks is new and the spring is new.and i have the lower and upper strut bars..</TD></TR></TABLE>

who did the work?

i would double check the bolts and make sure they're torqued down. i would also check to make sure the spring is seated right. last but not least, double check the lug nuts, make sure they're torqued too.