I'm going to keep this post as short as possible. I'm not a mechanic, but I have a decent grasp of mechanical things once I learn what's what. Based on videos I've seen online, and suggestions I've read, I'm pretty sure this is VVT phaser rattle, likely due to a sticky\lazy locking pin. If you don't have much time, just check the first link below and the bold part at the bottom.
Here is a link to a recording of the sound my car makes. Please listen to the _STARTUP_RATTLE one. That's the one I'm focusing on.
Here is better recording of a Toyota motor making a very very similar sound.
If you want lots of details, here is a thread I started on Hyundai Forums about this.
Summary: Three weeks ago I bought a car used with 60k miles, amazingly clean, good service history according to carfax, but it makes a very loud 1-2 second rattle on startup after it has sat for an hour or two. It doesn't do it every time... and sometimes the rattle is very short and happens half a second after starting. It drove beautifully on a 450 mile trip (from the southern VA to northern PA) back home after purchasing it, and it still drives beautifully.
Did an oil change about 10 days ago with QS Ultra Durability Full Synthetic 5w30 and a Hyundai OEM filter (someone used a made in China Fram filter last). Noise seems queiter some times, but just as noisy as ever other times.
This is apparently somewhat common with these engines, and to replace\update the parts (new style phaser and matching cams) that are likely causing this rattle, I'd likely be looking at several thousand dollars after labor. Replacing only the phasers is another option, but still tons of labor involved. On the other hand, others have said they've fixed similar VVT issues in other vehicles with simple fluid additives.
Is there a way to clean a VVT phaser to remedy a sticky locking pin, or improve the oil pressure going to the pin without having to take the side of the engine off? Either with oil\fuel additives or treating a specific area that isn't so hard to reach? I would never do this without a professional opinion, but is there any chance that applying some kind of treatment to the vvt solenoid would then pass that treatment onto the gunked up locking pin?
Let me know what you think. This problem has me majorly stressed out, because it's a beautiful vehicle and it's exactly what we needed (and could afford)... but that noise is pretty scary.
Here is a link to a recording of the sound my car makes. Please listen to the _STARTUP_RATTLE one. That's the one I'm focusing on.
Here is better recording of a Toyota motor making a very very similar sound.
If you want lots of details, here is a thread I started on Hyundai Forums about this.
Summary: Three weeks ago I bought a car used with 60k miles, amazingly clean, good service history according to carfax, but it makes a very loud 1-2 second rattle on startup after it has sat for an hour or two. It doesn't do it every time... and sometimes the rattle is very short and happens half a second after starting. It drove beautifully on a 450 mile trip (from the southern VA to northern PA) back home after purchasing it, and it still drives beautifully.
Did an oil change about 10 days ago with QS Ultra Durability Full Synthetic 5w30 and a Hyundai OEM filter (someone used a made in China Fram filter last). Noise seems queiter some times, but just as noisy as ever other times.
This is apparently somewhat common with these engines, and to replace\update the parts (new style phaser and matching cams) that are likely causing this rattle, I'd likely be looking at several thousand dollars after labor. Replacing only the phasers is another option, but still tons of labor involved. On the other hand, others have said they've fixed similar VVT issues in other vehicles with simple fluid additives.
Is there a way to clean a VVT phaser to remedy a sticky locking pin, or improve the oil pressure going to the pin without having to take the side of the engine off? Either with oil\fuel additives or treating a specific area that isn't so hard to reach? I would never do this without a professional opinion, but is there any chance that applying some kind of treatment to the vvt solenoid would then pass that treatment onto the gunked up locking pin?
Let me know what you think. This problem has me majorly stressed out, because it's a beautiful vehicle and it's exactly what we needed (and could afford)... but that noise is pretty scary.