Wondering if anyone can give me an idea of what they think a noise might be under my hood. My car is a 2005 Pontiac vibe with 213,000 miles on it. Some of the parts are still original. Can't remember the last time my spark plugs were changed. Problem the other day I noticed, when I got in the car in the morning, it sounded to me like the valves were louder than normal, which alarmed me. As I drove it seemed to get quieter. I"ve done my oil changes religiously every 3000 miles and once in a while have added fuel additive to keep my pistons clean. I have no engine lights coming on. So wondering if I might need a tuneup, which I also cannot remember the last time it was done.
Can anyone help with what they think this could possibly be?