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I have a slight engine knock in the rear middle cylinder I think. I looked arround and found that it is caused by a HLA? That the same thing as a lifter? Is it on top of the head? Easy to replace? Cost?

You're correct, it's the HLA.<P>It's expensive to have done by itself but you can have it taken care of during your next timing belt change.<P>Getting to the HLA (Hydraulic Lifters *dunno what the "A" is for Adjusters(?)*)requires removal of the timing belt.<P>Sorry, that's probably not what you wanted to hear. Meanwhile, just keep fresh oil in it.<p>[ August 25, 2002: Message edited by: mjlohman ]

if your not familiar with the HLA,<BR> <A HREF="http://crco.com/solid_lash_adjuster_theory.htm" TARGET=_blank>http://crco.com/solid_lash_adjuster_theory.htm</A> <P>I may be wrong, but I believe we have a similar setup on Mazda motors.

I don't care what anyone says. It's the f---ing camshaft friction gear (about $1100 candian to fix at a mazda dealership). Trust me man, it's not the HLA's. I had the exact same problem you, i took like 2-3 weeks reading about every single thread pertaining to 'ticking'...i thought for sure it was the lifters or bent valves.<P>HOWEVER, it will not hurt your engine to not get it fixed. It's just annoying as hell. I know you still going to think it's the HLA's...but it's not. Take it to Mazda and they will tell you the exact same thing im telling you. Trust me!