What does the timing chain sound like?
My bonneville is making a metallic rattle sound at idle. Sounds like someone is holding a piece of metal against one of the pulleys. I just had the catalytic convertor replaced, so I know its not that. Also, since this sound has come up, the car is starting hard when cold. I know both of these things are hard to diagnose without hearing it in person, but I know that these cars usually need the timing chain replaced around 150k miles, I am just wondering if that could be what is wrong, or if I should look for something simpler.
I just remembered, the car also makes the sound inbetween shifts, it seems to be whenever the engine doesn't have a load on it. Hopefully I will have a better description this weekend when I get a chance to look at it in the daylight. Thanks!