Cold Start Rattling Sound

[RamR33]

hey guys,

have a rattle/type vibration sound,the sound is like coming from the right side/turbo,it doesnt sound like an exhaust leak. when stating up when cold and only does it as i rev it up to 2000rpm and as soon as its dropping back half way down to normal revs it makes a like rattle drrrr vibration sound and as its warming up it goes away slowly till warmed up and then no more of that sound.

any ideas or anyone experience this?

Edited October 8, 2011 by RamR33

[reeceo21]

It wouldnt be an exhaust leak if it is only when cold. generally an engine that rattles when cold means its on its way out check to see if it is bottom end. if so bad news. top end generally in my opinon isnt to bad its normally just because oil hasnt reached there yet. my old commodore had noisy lifters when cold. flogged the tits out of her for 40000k and still couldnt kill it. went through 2 gearboxs and the new owner gives it a hard time and just cant do it in. good ol ecotecs

[RamR33]

na its not the bottom end plus like i said only when cold for 5 or so minutes then goes away....sounds more to the right side from the cam cover near there.....im pretty sure if it was the bottom end it would not stop.

[jjman]

When did u last have the timing belt done?

[gotRICE?]

When did u last have the timing belt done?

^^ this.

Post up a video of it.

[RamR33]

i hadnt done it as the person said the engine was recoed so thought it wouldve been done or maybe not and only done 20,000ks and so thought not to touch it as i heard every 100,000k to change it...i even took the oil cap off to hear if it was coming from inside but it sounds more external.

as it warms up it goes away when its getting warmer to its normal temp doesnt do it gone after 5 min or so.

ill post up a video soon,ill try and get the sound of it clear.

Edited October 12, 2011 by RamR33

[gotRICE?]

So does it do it just when you crank the engine? Or are you saying its a rattle at a certain RPM when its cold?

If the engine was re-con'd then yeah it was most likely changed, but it seems fairly common for RB idler and tensioner pulleys to be noisy.

Does it sound like this? (this was mine) Cambelt change fixed it.

[RamR33]

Yeah thats the sound mate on the video like the wen the revs come down u can hear it more like grrrr brrrr soundss identical spot on.

it started to do it after the service aswell,could it be the oil,,all i no is he put some martini racing oil 15w-50

wat is that buddy?

Edited October 12, 2011 by RamR33

[RamR33]

how do i go about fixing it?

[gotRICE?]

Tyoull have to do a cambelt change. And replace the idler and tensioner. No other way around it really.

[RamR33]

wouldnt no the chaepest way to set me back on someone to do it? or how much?

not gonna cause any problems if left for a week or so will it?

Edited October 12, 2011 by RamR33

[gotRICE?]

Nah. Mine sounded like that for 1.5 years before i got the courage to change everything myself haha.

It wont be cheap. The parts alone will be over $300 depending who you know. Then labour, probly 3-4 hours. it took me 6, going slow and taking my time as id never done a cambelt before.

[jjman]

If i was you id chase down the history of the motor.<BR><BR>mine makes <U>exactly</U> this sound but only after having the cambelt , tensioner, pulley etc done.<BR>its actually a pretty common noise from the kevlar cam belts. It often stops after a while as the belt kinda beds in i guess. Mine has pretty much stopped now.<BR><BR>Having said that tho it can also be the sound of one of those components on its last legs and a cambelt failure isnt far away = fully lunched motor. Avoid like the plague.... <IMG class=bbc_emoticon alt= src="http://www.skylinesaustralia.com/forums/public/style_emoticons/default/yucky.gif"> <BR><BR>has ur motor always made this sound or only just started to make this sound? if it has just started then its most likely time to do the '100k service'. If not it might be the noise of the kevlar belt if it was replaced in recent history...make sure tho.<BR><BR>Also make sure the water pump has been done. It should have been done at the same time as the timing belt n they are known to let go n also can be a major problem... (obviously)

Edited October 13, 2011 by jjman

[jjman]

not quite why the tex shat itself after i edited-

here it is unadultered.

If i was you id chase down the history of the motor. mine makes exactly this sound too, but only after having the cambelt , tensioner, pulley etc done. Its actually a pretty common noise from the kevlar cam belts. It often stops after a while as the belt kinda beds in i guess. Mine has pretty much stopped now. Having said that tho it can also be the sound of one of those components on its last legs and a cambelt failure isnt far away = fully lunched motor. Avoid like the plague....

has ur motor always made this sound or only just started to make this sound? if it has just started then its most likely time to do the '100k service'. If not it might be the noise of the kevlar belt if it was replaced in recent history...make sure tho. Also make sure the water pump has been done. It should have been done at the same time as the timing belt n they are known to let go n also can be a major problem... (obviously)

[RamR33]

na it just started after i done a service and changed basicly everything,coils,spark plugs,oil filter,engine oil ect ect and after the engine oil service i notice that sound never done it before until one week or so ago.only had the car for 2/3 month.its not horrible sounding or anything but just find it strange when it warms up it goes away slowly and then the engine sounds fine,very strange.

[RamR33]

could it happen from being givin are hard time and the belt to go sooner then its origanal lasting time or any of the things u said??

[jjman]

yeah mine was exactly the same with the change based on temp... and most people note this. General consensus is timing belt noise.

cant imagine being able to hurt the belt unless you are limiter bashing like a madman or mistook your taco for a gtr one

seriously, work out when the timing belt (and water pump was done) they (and the rest of the 100k service stuff) are meant to be done every 100k or 10 years. Which ever comes first.

i was only 50k past the last 100k service when my water pump died (caught it straight away so no damage done). But after reading/translating the japanese on the 100k service sticker i was able to work out it was on 10yrs since the job was actually done...

[RamR33]

All i no is nizpro built it and was recoed,how do i no when the last time the belt was chaned or anything even tho ive changed basicly everything myself besides fuel filter lol.

I even took it to mechanics who just work on skylines and there like tuff engine bla bla bla and im like u sure nothing wrong or anything and they go yea just ya wiperblades need changing lol.

[silviaz]

So my rb is finally having more problems. 2 issues here but I'm here to just to mainly discuss the rattle noise.

The other day when I turned on the car and when I take off or go in reverse, there is a temporary rattle noise but when I cruise, boost, idle it's completely fine no rattle whatsoever. I've also done all the servicing, all the health checks you can think of and it all passes with flying colours. 

Also the rattle doesn't increase with rpm, it's only at a very certain rpm (slightly above 1,100rpm). My other car also has the same issue every once in a while. Changed the oil recently, no difference.

Even took my oil to a lab and everything was quite good surprisingly. Timing belt changed a while ago to. Had the car on the hoist and can't see anything obvious. Tightened a couple of nuts on the exhaust manifold a couple of months ago.

2 different clips uploaded. One of them was supposed to another issue but I'll save that for another time.

Thought I'd see if anyone had this same noise before, it's a bit hard to diagnose while it's intermittent.

If I'm not mistaken, I think I had this a while back but can't remember exactly.

I was thinking if it's doable I'll get someone to hold the throttle cable at 1,100rpm and hopefully it replicates the sound.

Edited June 23 by silviaz

[TurboTapin]

Have you gotten under the car to look for anything that can rattle? I bet you it's a heat shield.