1998 Honda Passport EGR valve

Yes you can try cleaning it first before replacing it. Be sure to clean the passage to the EGR valve as well though. To clean the EGR valve, be sure to use carbon cleaner. Carbon cleaners can be purchased at auto stores. Just turn the valve upside down on a stable surface and fill it up with cleaner. Let it soak in the cleaner for at least 8 hours. Then, use a wire brush to remove any visible deposits left on the EGR valve. After soaking in the cleaner, any deposits should brush right off.