running rough

[Jay Holiday]

I just got an oil change maybe a month ago but it seems now my engine is running rough. I can't describe the sound that I hear from the hood of the car but it sounds like it's coming from the belt. When is a good time to replace my belt? I have 85k miles on the car now

[cochise325]

Belts can fail and do serious damage. At that mileage you should replace the belt, and the belt tensioner. You can find the parts you need here: www.ecstuning.com

It takes some muscle to relieve the belt tension, and you need to be careful because the spring is very strong.

If you have a Bentley manual, follow the directions in there and you will have a successful repair. Don't delay if you already hear noise.

[nateatl]

Are you sure it's a belt? My 335 was running rough a few months ago and all I needed was new spark plugs and coil packs.