Hi guys, tonight I was with a friend who just bought a used 2007 cadillac cts with the 2.8l. He was so happy that he called me to show me his ride and trying to compare with my 05 cts.
Short story: When idling, his engine has a weird sound and from the cadillac forum, most people say it could be bad timing chains. There's no check engine light and when I test drove the car, it was running number one.
There's kinda of a fluttering, chattering sound coming from the engine bay. We compared both engine sound and mine doesn't do it. So I called my boss, who has a 2.8l just like my friend and we compared the sound. The sound is only coming from my friends engine.
What I did, and tell me if I'm wrong, I took a screwdriver, I put one side on the front of the engine while the engine running and my ear on the other side of the screwdriver to pinpoint the problem. I've tried different places from the engine and each engine (both 2.8l and my 3.6l) as similar sound coming from inside the engine.
Now my question is this: could it be a serpentine belt since its looking like coming from the front of the engine? There's 2 belts but when you look at the one on the passenger side, you can see the tensioner shaking compared to the other one. When the engine is idling, you can easily hear the sound. When you rev the engine, you can hear it fluttering/chattering more but above 1200rpms, you cannot hear the sound anymore.
Now, I don't want to put the screwdriver on the belt neither on a pulley while the engine is running in case I mess something there but is there a way to check if its the belt or a pulley?
His car has 80k miles as far as I know compared to mine with 122k miles and I never changed the belts yet because the owners manual says to change it at 140k miles. Since I didn't need to change mine, I said to myself that my friends one is suppose to be good for another 60k...
Any input appreciated!
Short story: When idling, his engine has a weird sound and from the cadillac forum, most people say it could be bad timing chains. There's no check engine light and when I test drove the car, it was running number one.
There's kinda of a fluttering, chattering sound coming from the engine bay. We compared both engine sound and mine doesn't do it. So I called my boss, who has a 2.8l just like my friend and we compared the sound. The sound is only coming from my friends engine.
What I did, and tell me if I'm wrong, I took a screwdriver, I put one side on the front of the engine while the engine running and my ear on the other side of the screwdriver to pinpoint the problem. I've tried different places from the engine and each engine (both 2.8l and my 3.6l) as similar sound coming from inside the engine.
Now my question is this: could it be a serpentine belt since its looking like coming from the front of the engine? There's 2 belts but when you look at the one on the passenger side, you can see the tensioner shaking compared to the other one. When the engine is idling, you can easily hear the sound. When you rev the engine, you can hear it fluttering/chattering more but above 1200rpms, you cannot hear the sound anymore.
Now, I don't want to put the screwdriver on the belt neither on a pulley while the engine is running in case I mess something there but is there a way to check if its the belt or a pulley?
His car has 80k miles as far as I know compared to mine with 122k miles and I never changed the belts yet because the owners manual says to change it at 140k miles. Since I didn't need to change mine, I said to myself that my friends one is suppose to be good for another 60k...
Any input appreciated!