Weird noise at iddle from SR20DET *video* - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

mikey060 · 03-12-2008, 04:31 PM

At an iddle, my engine or something in the engine bay starts making an odd vibrating/rattle sound. i have never heard a sound like it before. when it starts making the sound, a few seconds into its idle, it can be stopped by lightly pressing the gas and putting the rpm over 1k. in the video, it starts with the sound being made, then i put the camera on the hood and press the gas lightly and it stops. then i open the hood and a few seconds later it starts again. i did just instal a new air filter and it hasnt been running as well as it did before. if anyone has any idea that would be great.

slider2828 · 03-12-2008, 08:01 PM

That is weird sound.... I would do a thorugh engine check like spark plugs, pull the valve cover off cause that tappin noise is valve tap but sounds a little loud. O also check for exhaust leak, it might be that.... So turbo to exhaust manifold, see if you feel any air coming out of the area between the manifold and turbo....

sac · 03-12-2008, 08:04 PM

ya it definately sounds like ya have a exhaust leak.

Do you have full exhaust hooked up? or just part of it?
i would fix the valve first. probably just loose but who knows.

ZX88 · 03-12-2008, 08:05 PM

maybe a broken exhaust hanger.

slider2828 · 03-12-2008, 08:06 PM

Valves don't get loose... and you can't tighten them.... Depends on the video it could be just exhaggerating the valve tap, but sounds a bit loud to me... Just see if you are getting enough lubrication.

Well also you have it in an enclosed area so noises are going to sound different.. Take it outside AFTER you see if there is any exhaust leak near the turbo area and then take another video...

mikey060 · 03-12-2008, 08:49 PM

thanks for the responses guys

the video is not exhaggerating the sound, it is as loud and the same pitch as it is in the video. i will have the car out tommarow so i will check for an exhaust leak. its going into the shop monday to have all its fluids changed so maybe its just a lubrication issue like you mentioned. and it has a full 3" catback exhaust with 3" downpipe. the car came from japan so maybe they didnt do something right. while its in the shop it is going to have almost everything checked so i will see if they can find the problem

Skaterjunky8 · 03-12-2008, 10:29 PM

yeah thats nothing in your motor, that main rattling is deff something rubbing, I would check your exhaust first then maybe the IC pipes. does it do it while driving or just idle? (Exhaust near tranny mount is usualy suspect#1) but just go in the back of the car while its off and start shaking the exhaust and see if you hear a thud

Sileighty_85 · 03-13-2008, 08:37 AM

Ok for the ticking sound you have Air in your HLA's ya need to bleed them,
that droning sound is external check you Alt the Bearing is probbaly going Bad it, my Friends made a similar sound.

mikey060 · 05-06-2008, 11:16 PM

alright, i am quite positive the turbo has been the cause of the sound. turns out the car has been running 14 psi on the stock turbo for god knows how long. since i posted this the sound has got a lot worse and the car is reallly starting to lag bad when you hit boost. so i am going to be swaping the turbo for a T-28GTi-R within the next few weeks. i will update after the swap...

AutoKA24DE · 05-06-2008, 11:28 PM

yeah if you havent already, check out your compressor blades.

my friend's evo 8's turbo was making really weird sounds (similar in a way to yours) and he was looking at everything else but the turbo.

turns out the compressor blades were literally disintegrated. dont know the exact cause, but probably foreign object damage.

fueled by hate · 05-07-2008, 01:57 AM

sounds like the downpipe rubbing against the frame rail. Mine made a similar noise when it did that and it was somewhat random. Or it could be rubbing against the steering knuckle, but your vid is too dark to tell.

sr20det drift · 05-07-2008, 05:00 PM

it sounds more like a vibration.

Style · 05-07-2008, 05:57 PM

yeah the rattling noise sounds like your lifters, bleed them and that other noise sounds like its your o2 or your downpipe rubbing on something.

mifesto · 05-07-2008, 06:02 PM

yes i have to agree, exhaust would be the first thing to check.

03-12-2008, 08:01 PM	#2
slider2828 Post Whore! Join Date: Oct 2004 Location: San Francisco, CA Posts: 6,040 Trader Rating: (13) Feedback Score: 13 reviews	That is weird sound.... I would do a thorugh engine check like spark plugs, pull the valve cover off cause that tappin noise is valve tap but sounds a little loud. O also check for exhaust leak, it might be that.... So turbo to exhaust manifold, see if you feel any air coming out of the area between the manifold and turbo.... __________________ Turn and Burn!

03-12-2008, 08:06 PM	#5
slider2828 Post Whore! Join Date: Oct 2004 Location: San Francisco, CA Posts: 6,040 Trader Rating: (13) Feedback Score: 13 reviews	Valves don't get loose... and you can't tighten them.... Depends on the video it could be just exhaggerating the valve tap, but sounds a bit loud to me... Just see if you are getting enough lubrication. Well also you have it in an enclosed area so noises are going to sound different.. Take it outside AFTER you see if there is any exhaust leak near the turbo area and then take another video... __________________ Turn and Burn!

03-13-2008, 08:37 AM	#8
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	Ok for the ticking sound you have Air in your HLA's ya need to bleed them, that droning sound is external check you Alt the Bearing is probbaly going Bad it, my Friends made a similar sound. __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

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03-12-2008, 04:31 PM	#1
mikey060 Leaky Injector Join Date: Dec 2007 Location: Calgary Age: 35 Posts: 64 Trader Rating: (0) Feedback Score: 0 reviews	Weird noise at iddle from SR20DET video At an iddle, my engine or something in the engine bay starts making an odd vibrating/rattle sound. i have never heard a sound like it before. when it starts making the sound, a few seconds into its idle, it can be stopped by lightly pressing the gas and putting the rpm over 1k. in the video, it starts with the sound being made, then i put the camera on the hood and press the gas lightly and it stops. then i open the hood and a few seconds later it starts again. i did just instal a new air filter and it hasnt been running as well as it did before. if anyone has any idea that would be great.

03-12-2008, 08:04 PM	#3
sac Zilvia Addict Join Date: Feb 2008 Location: The SLC, Utah Age: 39 Posts: 794 Trader Rating: (3) Feedback Score: 3 reviews	ya it definately sounds like ya have a exhaust leak. Do you have full exhaust hooked up? or just part of it? i would fix the valve first. probably just loose but who knows.

03-12-2008, 08:05 PM	#4
ZX88 Post Whore! Join Date: Oct 2005 Location: ATX Age: 36 Posts: 2,946 Trader Rating: (8) Feedback Score: 8 reviews	maybe a broken exhaust hanger.

03-12-2008, 08:49 PM	#6
mikey060 Leaky Injector Join Date: Dec 2007 Location: Calgary Age: 35 Posts: 64 Trader Rating: (0) Feedback Score: 0 reviews	thanks for the responses guys the video is not exhaggerating the sound, it is as loud and the same pitch as it is in the video. i will have the car out tommarow so i will check for an exhaust leak. its going into the shop monday to have all its fluids changed so maybe its just a lubrication issue like you mentioned. and it has a full 3" catback exhaust with 3" downpipe. the car came from japan so maybe they didnt do something right. while its in the shop it is going to have almost everything checked so i will see if they can find the problem

03-12-2008, 10:29 PM	#7
Skaterjunky8 Leaky Injector Join Date: May 2004 Location: Hawaii Posts: 57 Trader Rating: (0) Feedback Score: 0 reviews	yeah thats nothing in your motor, that main rattling is deff something rubbing, I would check your exhaust first then maybe the IC pipes. does it do it while driving or just idle? (Exhaust near tranny mount is usualy suspect#1) but just go in the back of the car while its off and start shaking the exhaust and see if you hear a thud

05-06-2008, 11:16 PM	#9
mikey060 Leaky Injector Join Date: Dec 2007 Location: Calgary Age: 35 Posts: 64 Trader Rating: (0) Feedback Score: 0 reviews	alright, i am quite positive the turbo has been the cause of the sound. turns out the car has been running 14 psi on the stock turbo for god knows how long. since i posted this the sound has got a lot worse and the car is reallly starting to lag bad when you hit boost. so i am going to be swaping the turbo for a T-28GTi-R within the next few weeks. i will update after the swap...

05-06-2008, 11:28 PM	#10
AutoKA24DE Zilvia Member Join Date: Nov 2005 Location: 818 California Posts: 176 Trader Rating: (0) Feedback Score: 0 reviews	yeah if you havent already, check out your compressor blades. my friend's evo 8's turbo was making really weird sounds (similar in a way to yours) and he was looking at everything else but the turbo. turns out the compressor blades were literally disintegrated. dont know the exact cause, but probably foreign object damage.

05-07-2008, 01:57 AM	#11
fueled by hate Zilvia Member Join Date: Sep 2007 Location: norcal Posts: 290 Trader Rating: (12) Feedback Score: 12 reviews	sounds like the downpipe rubbing against the frame rail. Mine made a similar noise when it did that and it was somewhat random. Or it could be rubbing against the steering knuckle, but your vid is too dark to tell.

05-07-2008, 05:00 PM	#12
sr20det drift Leaky Injector Join Date: Feb 2008 Location: chi Posts: 112 Trader Rating: (0) Feedback Score: 0 reviews	it sounds more like a vibration.

05-07-2008, 05:57 PM	#13
Style Zilvia Junkie Join Date: Sep 2006 Location: on the corner Posts: 337 Trader Rating: (10) Feedback Score: 10 reviews	yeah the rattling noise sounds like your lifters, bleed them and that other noise sounds like its your o2 or your downpipe rubbing on something.

05-07-2008, 06:02 PM	#14
mifesto Zilvia Member Join Date: Jul 2007 Location: NJ Posts: 209 Trader Rating: (2) Feedback Score: 2 reviews	yes i have to agree, exhaust would be the first thing to check.