My 86 420SEL has 189xxx miles, the engine was an LKQ unit put in at about 120xxx, and had new timing chain at that time. I noticed a ticking several months ago, hat turned out to be the A/C compressor. I just run the climate control in ECON mode now so the compressor doesn't run, so that tick is gone until summer.

Now for my new problem...over the past week a ticking noise went from non-existent to noticeable at idle, to noticeable up to about 25 MPH...then tire noise covers it up. It appears to be coming from the right side of the engine, but I can't pinpoint its source. The car runs fine, good oil pressure, temp is normal. I'm due for an oil change, so hopefully stray parts of the car won't fall out with the oil, but what are the potential things to look for, and how do I go about diganosing this?

__________________
2002 Ford ZX2
2 x 2013 Honda Civics