I am new to this forum but not a new Jeep owner. I have a tapping sound in my engine. It's driving me crazy! It's been doing it for a couple of weeks now. It had a oil change last month so I checked and oil and other fluid levels are good. The only thing different is I changed my air filter out a couple of weeks ago. One of the things I have read is that sometimes a different air filter can cause a tapping sound. Has anyone else heard or experienced that? I threw my old filter away so I can switch it back to see.