Loud kocking/rattling sound on start-up that disappears
I'm not sure if it's anything to worry about or not, but here lately, I've had the Tib making some strange noise but only when you first start it up. It's like an extremely loud rattling/clanking noise. It doesn't do it when cranking, it's only when the car first starts up (more noticeable on cold start-up). It's also not every time you start it, only when it's been sitting awhile (such as over night). I'm not exactly sure what it is but it's pretty loud. After about 10-15 seconds or so, the sound settles and is no longer audible. I have no idea as to what it could be, At first, I thought it was the exhaust vibrating or rattling against something but I don't think that's the case. It sounds like it's coming from the lower portion of the engine/block. I don't think it's a rod knock since it only lasts for a few seconds. I was kinda thinking it might have something to do with the crank but I could be wrong.
I'll try to get it on film here soon. It's hard to do so since it only lasts for 15 secs if that and then stops. I don't feel any issues when driving nor do I feel a loss in power. It's really hard to describe. I also don't have any CELs either. The Tib seems to idle properly as well. I'm thinking I'll probably have to take it into the shop for diagnosis here soon to figure out what it is. Best way to describe it, is that it sounds like someone is knocking rapidly on a wooden block or table for a few seconds.
Oh and another thing I noticed, sometimes if u turn the wheel and hold on to it, the sound may stop. The moment u let go of the steering wheel, it comes back until it stops completely.
Any suggestions on what it could be? Does this sound like something I should be concerned about?
BTW, I've only used OEM Hyundai filters from the dealership and regular 10w-30 oil.
Last edited by JayTee; 08-28-2012 at 12:41 AM.