First off let me saying I am no newby.
I have built several 1 ton jeeps in the past. I bought this jeep strictly for work. I got a solid deal on it knowing that the oil pressure is good, runs smooth, not loss of power and extremely clean being an 02.
Now the issue: No check engine lights but I did the key trick upon test driving it and found a P0455 (vacuum leak) It does not run or idle rough, however it makes a knock similar to this.
Anyone dealt with a similar issue? I have no problem pulling it apart and checking the timing chain tensionors. Want some first hand experience before I do so. Thanks in advance.