I have a 1993 saturn SL2 1.9L dohc engine and at certain rpm it makes a click sounding like it is coming from front of engine i think its timing chain tensioner any ideas?

I do not know what your mileage is but if you are over 110,000 in a DOHC then a cam chain is in order unless it has already been done. when you do it get a kit as the are guides, sprockets, and a tensioner needed as well. when you are putting it back together do the serpentine belt tensioner and the dog bone motor mounts. generally a cam chain sounds more like loud whirr than click. sticky valves click, but that generally goes away as the engine warms up. a/c clutch could make a click cutting in and out if the system is dry and there is nothing to compress. have you tried this in park with the hood open and someone else hitting the gas pedal to hit the magic rpm? you might see something attending the click or get some better idea as to exact location.