My cavalier is a Z24 with the original 3.1L V6. When cool, the engine runs fine for about 20 miles and then I can feel a change. The whole car begins to viberate as I am driving. More pronounced under engine load. I can feel the vibration in the steering wheel, floor, seats, even the inside rear view mirror shakes so bad you can see anything in it. The exhaust smells very rich at that point. The catalytic converter glows and the fuel mileage drops in half. The exhaust is so hot the left rear tail light has melted from the heat of the muffler. I pulled the coils expecting one bad, but they test out fine. The car has a DIS system and MFI.
Friday, November 2nd, 2012 AT 11:40 PM