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#1 Old 07-13-2012, 11:56 AM
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Question 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.
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#2 Old 07-13-2012, 12:33 PM
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Re: Loud kocking/rattling sound on start-up that disappears

Power steering pump maybe? Do you hear a "whining" when you turn the wheel at idle?


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#3 Old 07-13-2012, 01:27 PM
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Re: Loud kocking/rattling sound on start-up that disappears

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Power steering pump maybe? Do you hear a "whining" when you turn the wheel at idle?
No, it runs real good and sounds "normal" i believe. This noise i'm talking about sounds like it's coming from inside the block. I don't really think it's the power steering pump. It's weird tho. I don't know why, it just seems like the crank or something. I'm not mechanically inclined which is why my car is basically stock. I just think it's really weird. I'm thinking it's a knocking noise it's making but only for a few seconds and quits.

I'll get a video up when i get the chance. it's really strange that it goes away so quick..... thats what has me stumped on what it could be.
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#4 Old 07-13-2012, 01:34 PM
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Re: Loud kocking/rattling sound on start-up that disappears

i have a small knocking/vibrating as well and its coming from bad bearings on my idler pulley
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#5 Old 07-13-2012, 02:01 PM
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Re: Loud kocking/rattling sound on start-up that disappears

Could be your starter making extra contact with your flywheel


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#6 Old 07-13-2012, 10:08 PM
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Re: Loud kocking/rattling sound on start-up that disappears

...or a loose rod bearing that quiets down when oil pressure builds. How many miles are on the car? Keep up on the oil changes?
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#7 Old 07-14-2012, 03:14 AM
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Re: Loud kocking/rattling sound on start-up that disappears

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...or a loose rod bearing that quiets down when oil pressure builds. How many miles are on the car? Keep up on the oil changes?
This sounds like what it probably is. Like I said before, it happens usually once it's started for the first time after being left sit for an extended amount of time (such as overnight). It has about 50k and yes I keep up on the oil changes. I am still showing full since the last time i changed it which was about 800 miles ago. The oil is also real clean, no gunk or discoloration present.

I'll try to get a video tomorrow if i remember.
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#8 Old 07-14-2012, 06:50 AM
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Re: Loud kocking/rattling sound on start-up that disappears

You may not be alone on this. I have just experienced this sound the first time ever today. Starting up my car which was not driven for 2 days. It was loud and sudden but no effect on performance or feel. My car probably has reached 3k since the last service and oil change, most of the driving based on the freeway. It only occurs on the first start too. The sound had me checking the engine in fear of something serious. Couldn't find anything and was late to work lol.

Keen to see your video.
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#9 Old 07-15-2012, 06:33 PM
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Re: Loud kocking/rattling sound on start-up that disappears

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You may not be alone on this. I have just experienced this sound the first time ever today. Starting up my car which was not driven for 2 days. It was loud and sudden but no effect on performance or feel. My car probably has reached 3k since the last service and oil change, most of the driving based on the freeway. It only occurs on the first start too. The sound had me checking the engine in fear of something serious. Couldn't find anything and was late to work lol.

Keen to see your video.
BTW, what's the condition of your flex pipe? I at first thought the sound was coming from the flex pipe. Not sure if that is it or not. It's definitely louder under the car as well as in the engine bay. The flex pipe would be right under the block, which could make it hard to determine what the sound is actually coming from. . . . As for the the rods being loose, is this really dangerous? Is it something I should be concerned about and/or have repaired asap? If so, is the that sort of repair usually covered under an extended warranty? or is this typically an expensive repair?

I'll have to find my main cam. The cam i tried was a pos. the sound quality was horrible. It was just to loud.
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#10 Old 07-16-2012, 09:46 PM
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Re: Loud kocking/rattling sound on start-up that disappears

Hmm I haven't checked my flex pipe. Not sure how to either. May need a friend to help check it out. Although our sound location is similar it appears mine is only for a split second after a cold start up in a period of a couple days. If it becomes more common or extends the time of noise I will be really concerned.
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#11 Old 07-17-2012, 05:45 AM
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Re: Loud kocking/rattling sound on start-up that disappears

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Hmm I haven't checked my flex pipe. Not sure how to either. May need a friend to help check it out. Although our sound location is similar it appears mine is only for a split second after a cold start up in a period of a couple days. If it becomes more common or extends the time of noise I will be really concerned.
Yea same here. Mine doesn't do it all the time, only on cold start ups. Mine's usually for a second or 2. Depending on how cold it is or I guess long it's sitting, I've heard it do it for about 30 seconds and then stop. Sometimes turning the steering wheel will cause it to stop or quieten it up until it completely disappears. Once it disappears, u never hear it for the rest of the day.

As for the flex pipe, just look under the car at it. Mine has tears in the "flex" parts.

I'm just not sure if this is something to worry about or not.
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#12 Old 07-17-2012, 12:06 PM
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Re: Loud kocking/rattling sound on start-up that disappears

I've heard that using a non-OEM filter can cause that, because it can cause the lubrication system to bleed down when the engine isn't run for awhile. I haven't experienced it myself. That sound would concern me if it were my car making it.
I would try a Hyundai OEM filter and synthetic 5w30 at your next service, and see what happens.

FWIW, I'm using Napa Gold (Wix premium) filters in my own car, and have been for many years.
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#13 Old 07-17-2012, 02:42 PM
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Re: Loud kocking/rattling sound on start-up that disappears

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I've heard that using a non-OEM filter can cause that, because it can cause the lubrication system to bleed down when the engine isn't run for awhile. I haven't experienced it myself. That sound would concern me if it were my car making it.
I would try a Hyundai OEM filter and synthetic 5w30 at your next service, and see what happens.

FWIW, I'm using Napa Gold (Wix premium) filters in my own car, and have been for many years.
Yea, i've read around about Tibs not liking aftermarket filters so I only use OEM. I tried getting a vid of it yesterday but it didn't make the sound. Strange . . . I wonder if it was because it was parked in my yard on a hill slightly angled. The driver side of the car would be a little lower than the passenger side due to the hill in the yard.

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#14 Old 07-17-2012, 09:14 PM
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Re: Loud kocking/rattling sound on start-up that disappears

I am using an Injen SRI Intake with an oiled filter. Been doing so for months now. I am curious if a pod change could avoid it in the future.
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#15 Old 07-17-2012, 10:00 PM
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Re: Loud kocking/rattling sound on start-up that disappears

I had a similar issue about 4 years ago , i switched to mobil 1 10w30 with oem filter and never had an issue again , my car engine currently have 80, 000 miles and runs great, it could be your oil is not lubing well the enginr internals, thats why in switched to synthetic , itnhas better cold performance.

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#16 Old 07-18-2012, 05:43 AM
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Re: Loud kocking/rattling sound on start-up that disappears

^^^ I have the same set up, I think it's just the engines in these cars, seems to start happening to me on a cold start after about 2500 miles on my oil, it will make 3 knocks sometimes 2 then is gone when the firing catches

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#17 Old 07-18-2012, 01:58 PM
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Re: Loud kocking/rattling sound on start-up that disappears

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^^^ I have the same set up, I think it's just the engines in these cars, seems to start happening to me on a cold start after about 2500 miles on my oil, it will make 3 knocks sometimes 2 then is gone when the firing catches
I'm not sure. It could be related as the symptoms would make sense. I'm just trying to determine whether or not I should be worried and take it in to be diagnosed. I really can't afford to take it in at the moment. It just has me a little worried.
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#18 Old 07-18-2012, 02:05 PM
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Re: Loud kocking/rattling sound on start-up that disappears

Do you have a oem filter?

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#19 Old 07-18-2012, 10:24 PM
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Re: Loud kocking/rattling sound on start-up that disappears

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Do you have a oem filter?
Yes, I have an OEM Oil Filter, as well as 10w30 Oil from Hyundai. Last oil change was actually done at Hyundai instead of on my own due to time and scheduling issues. I didn't have the time to jack the car up and do it myself so I just stopped and had them do it. . .

I'm just worried that maybe it's something with the rods, such as a loose rod. I would think that is something to be concerned about. I just would hate to pay a $150 diagnostic fee or so just to find nothing was wrong with it. Had some things going on lately and really need to save as much money as possible. $150 may not seem like a lot, but for me at the moment, it would be really hard to spare (considering I don't even have it right now).

Today it only did it only did it slightly for about 3 seconds and wasn't as audible. . . . strange. I'm not that familiar with problems in regards to engine failure due to lack of experience/knowledge. I just know the sound seems like something that would usually cause concern.
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#20 Old 07-24-2012, 02:49 PM
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Re: Loud kocking/rattling sound on start-up that disappears

This is somewhat normal for these cars and engines in general. Its from the oil not reaching the heads when started from a cold-start. My 2008 Accent had the same sound when it was purchased new with 20 miles on it. Mine makes the same sound as well. Let it sit for about 30 seconds or so and the sound disappears.

I wouldn't worry about it too much unless it becomes a consistant sound at all start ups or while its sitting idle during a daily drive. That's when you need to worry. Just stay current on your maintenence schedule and you shouldn't have any problems. And the OEM filter doesn't change anything. Always had an OEM filter on my Tib and the sound still occurs, same with my Accent.

Hope this helps

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#21 Old 07-25-2012, 06:58 PM
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Re: Loud kocking/rattling sound on start-up that disappears

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This is somewhat normal for these cars and engines in general. Its from the oil not reaching the heads when started from a cold-start. My 2008 Accent had the same sound when it was purchased new with 20 miles on it. Mine makes the same sound as well. Let it sit for about 30 seconds or so and the sound disappears.

I wouldn't worry about it too much unless it becomes a consistant sound at all start ups or while its sitting idle during a daily drive. That's when you need to worry. Just stay current on your maintenence schedule and you shouldn't have any problems. And the OEM filter doesn't change anything. Always had an OEM filter on my Tib and the sound still occurs, same with my Accent.

Hope this helps
U know that u mention it, i sometimes hear it after the first start-up and when i first start driving. It's very faint but it can be heard. after about 30 seconds or so, it stops. What has me worried is that it hasn't always done this before. It has a newer engine which should be just at around 50k miles on it and it's making the noise. It honestly sounds more like a rattling noise or like a faint knocking. It's not ticking, but knocking. . . . usually that's something to be concerned about.
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#22 Old 07-25-2012, 07:18 PM
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Re: Loud kocking/rattling sound on start-up that disappears

The same thing happened to me!!!! I never had any problems with my Tib but one morning I turned it on and had the same issue the car even vibrated when it happenes, then it went away and never happened again. I took it to the mechanic and left the car there a whole day and it never occurred again, its so mind f*cking...


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#23 Old 07-25-2012, 07:27 PM
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Re: Loud kocking/rattling sound on start-up that disappears

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The same thing happened to me!!!! I never had any problems with my Tib but one morning I turned it on and had the same issue the car even vibrated when it happenes, then it went away and never happened again. I took it to the mechanic and left the car there a whole day and it never occurred again, its so mind f*cking...
The problem is that for it to be properly diagnosed, I'd have to leave it overnight at some shop and then they start it cold. I can't just drive somewhere and start the car and them hear it. It's strange. I tried getting a video of it and it never did it. It did it today though
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#24 Old 07-25-2012, 07:28 PM
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Re: Loud kocking/rattling sound on start-up that disappears

I have the feeling its the motor's pythons...


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#25 Old 07-25-2012, 07:30 PM
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Re: Loud kocking/rattling sound on start-up that disappears

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The problem is that for it to be properly diagnosed, I'd have to leave it overnight at some shop and then they start it cold. I can't just drive somewhere and start the car and them hear it. It's strange. I tried getting a video of it and it never did it. It did it today though
thats what I tried, I left my car at the shop and it never happened again... and they have to hear it so they can understand what it is. Sadly in these cases it could be so many things that simply describing it doesnt help. First thing I thought was that I had an animal stuck in my hood lmfao cause it was such a loud wierd noise and my car shaked!! ... but there wasnt any animal lol


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