I am a new, first-time Jeep Wrangler owner. I got a great deal on the Jeep due to the aforementioned knocking sound coming from the engine. It is a 1999 Jeep Wrangler SE w/ a 2.5l engine and 139k miles.
We took off the valve cover a few days ago and ran it for a couple of minutes, but could not pinpoint the sound and did not notice anything obvious. It still has good oil pressure (40+) and we have drove it for 300+ miles since the knock started, without any noticeable change in the sound. So, I'm coming to the experts to see if anyone else might have some advice to offer.
Am I looking at a new engine? Or, should I try anything else first? The only mechanic we saw told us to drive it until it quits. Is that the best idea?
Let me apologize in advance for the poor audio. The transition to youtube seems to have added some background noise. You can hear the knock, but it also kind of sounds like the engine is skipping in the video, which it is not. Here is a link to the video:
YouTube - 2.5l Jeep engine knocking sound?