<strong>Yahoo Message Number: 106616</strong>I had a similar issue with a black line appearing on the floor and on the back wall of the closet. I found pin hole leaks on the muffler which let exhaust escape into the engine compartment. I replaced the muffler and that solved the issue, with no more soot caused black lines in the past 15,000 miles.<br/><br/>Dennis 2003 36' Allure #30884