Without hearing the noise, my guess is wheel bearing or (possibly) CV
joint. Wheel bearings can take a long time to die, usually, and get
progressively noisier as they go until they roar pretty loudly. CV
joints usually make a rapid clunking noise in very tight low-speed turns
when they start to go bad.
The wheel bearing on the '90 is a real PITA to change. Consider having
it done if that's what the problem is.
have you changed the disc or caliper recently? there's a different
thickness in disks between 89 & 90, [89 is skinnier] and the caliper
needs to be correct to accommodate. if there's an incorrect caliper
relative to the disk, you'll hear a scraping noise when you corner. or
it's just a bearing. time to inspect.
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