My 25-year-old son has a 2002 Kia Optima. He called on Monday after our cold snap here in Los Angeles, saying his car sounded funny when he started it. I told him that if it went on for more than a few minutes to drive it to our mechanic. The car shook a lot as he drove it, and so he went to the mechanic who guessed it was the timing belt. The car had 98,000 miles on it, and the timing belt had never been replaced. The mechanic replaced the timing belt and the water pump while he was at it (suggested maintenance.) When my son picked the car up and drove it a bit, he said it still shook. I then drove it, and it felt like a junk heap. We took it back.
The mechanic checked the motor mounts and found two out of three were broken. He replaced them. However, while much of the shaking has gone away, there is still some shaking going on. You can feel it when the car idles and not in gear. The mechanic has flushed the transmission and replaced the transmission fluid, but the shaking is still there as if something is out of balance at idle. The mechanic has kept to car to puzzle it out. He said he doesn’t want to drive it as he doesn’t want to break the new engine mounts ($300 each–he showed me where the other two had major cracks). Anyone have any ideas as to what might cause the shaking?