Go Back   Club Lexus Forums > Lexus Model Forums > SC Models > SC 400/300
Sign in using an external account
Register Forgot Password?

Trying to figure out this noise/vibration. opinions?

Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 11-20-14, 09:26 PM   #1
scRuss
Driver School Candidate
Trader Score: (0)
 
Join Date: Jul 2014
Location: ca
Posts: 13
Default Trying to figure out this noise/vibration. opinions?

92 sc400 All stock 136k
I have this mmmm sound with a little/bit of vibration. Sound is I wanna say middle/passenger side

Just Flushed the power steering thinking it would resolve my prob. (Needed to be done anyways)
Its the loudest in P and N. When I use accessories as well. It goes a little bit with the rpm.
I havent a clue what it could be

I have a video but dont know how to upload it here
This ad is not displayed to registered members.
Register your free account today and become a member on Club Lexus!
scRuss is offline   Reply With Quote
Old 11-21-14, 12:47 AM   #2
oldManTan
Lexus Test Driver
Trader Score: (0)
 
Join Date: Jan 2014
Location: illinois
Posts: 1,030
Default

upload video to youtube then here. is it inside the car? how loud is it?
__________________
'92 SC400 Tan on Tan, BFI, Tanabe Medallion exhaust,
Megan Racing EZ Street Coilovers, TechnaFit SS lines, Blue TT Calipers,
A/T Solenoid Bypass, TT Auto Diff, MKIV LCAs,
4300k HIDs, IS300 Steering wheel,
Cobra R Reps 17x9 DZ102 225,45,
hopefully a 5 speed swap in the near future Build Here
Custom Headlights Build
oldManTan is offline   Reply With Quote
Old 11-21-14, 04:56 PM   #3
scRuss
Driver School Candidate
Trader Score: (0)
 
Join Date: Jul 2014
Location: ca
Posts: 13
Default

Quote:
Originally Posted by oldManTan View Post
upload video to youtube then here. is it inside the car? how loud is it?


Keeps saying error invalid video...
Its loud in the cabin and underneath the car.
very noticeable sound that gets louder when I use accessories and flick my lights on and off. And its the loudest in Park and Neutral.
I was thinking a trans mount or alternator bearing, pulley.
but wanted an idea from one of you gguys
scRuss is offline   Reply With Quote
Old 11-22-14, 01:06 AM   #4
oldManTan
Lexus Test Driver
Trader Score: (0)
 
Join Date: Jan 2014
Location: illinois
Posts: 1,030
Default

what is saying the error? youtube or this site? once you upload to youtube, just paste the link in the comment and you're set.
__________________
'92 SC400 Tan on Tan, BFI, Tanabe Medallion exhaust,
Megan Racing EZ Street Coilovers, TechnaFit SS lines, Blue TT Calipers,
A/T Solenoid Bypass, TT Auto Diff, MKIV LCAs,
4300k HIDs, IS300 Steering wheel,
Cobra R Reps 17x9 DZ102 225,45,
hopefully a 5 speed swap in the near future Build Here
Custom Headlights Build
oldManTan is offline   Reply With Quote
Old 11-22-14, 02:46 AM   #5
eknine9
Lead Lap
Trader Score: (5)
 
eknine9's Avatar
 
Join Date: Mar 2012
Location: TX
Posts: 510
Default

http://www.clublexus.com/forums/perf...an-i-tell.html

Check the serpentine belt tensioner as mentioned in the above thread.
__________________
http://i1182.photobucket.com/albums/x455/eknine9/SCBanner.png
eknine9 is offline   Reply With Quote
Old 11-22-14, 06:13 AM   #6
Twoforzero
Driver School Candidate
Trader Score: (0)
 
Join Date: Sep 2014
Location: Wa
Posts: 8
Beno Fool Twojaybee
Cool Go GO Harmonic balancer and mass air flow!

I had very similar problems (sc300 tho)

I agree with eknine9, haven't read that link but start by pulling your belt and investigate!! I checked the tensioner/pulley and my bearing was going but not that bad, slight "grainy" sound. Tension was fine. Wasn't satisfied.

Sooo...by accessories if you mean like turning your ac on you may want to pull the belt off and check your Harmonic Balancer. It might be skipping. The rubber that fails in between squeals when any excessive load such as using the Power steering, AC, or shifts in rpm will make it sound like a belt or p/s squeal. I believe this is also what caused my alternator to fail then eventually my maf went out(possibly unrelated and just failed over time as I do have 210k.) I thought it was my p/s and vacuum leak the whole time.

Replaced my HB which I found had come apart. Squeal AND Vibration GONE INSTANTLY!! Installed it along with a new gates belt, tensioner pulley (had to be done soon) and replaced alternator (regulator went out.)

Now for that ANNOYING IDLE ISSUE.
Couldn't fix above normal idle in P & N by playing with the tps or my throttle brackets or whatever you call them (where the throttle cables are held) without dropping down too low when I shifted into gear, almost stalling out at times. So after replacing vc gasket (I was there, had a slight leak so why not) plugs, wires, cap n rotor, and a thorough cleaning of the throttle body, iac valve, plenum butterfly, intake gaskets and replacing almost every vacuum line, I pulled the damn maf plug and nothing happened. I was suspicious. Bought a cheap used oem maf, replaced it, reset ecu and bam! No more weird idle issues! Still slightly higher cuz I played with the tps and throttle cable brackets earlier.

Tweaked both to where I felt comfy and now I have a steady idle at 850ish in P & N and when I shift into gear I drop to a steady 700.

Hope my experience helps! Have an awesome day!
Twoforzero is offline   Reply With Quote
Old 11-22-14, 12:20 PM   #7
scRuss
Driver School Candidate
Trader Score: (0)
 
Join Date: Jul 2014
Location: ca
Posts: 13
Default

Sc400 noise: http://youtu.be/5Wd_lW8qm2w

Yay!
scRuss is offline   Reply With Quote
Old 11-22-14, 12:28 PM   #8
scRuss
Driver School Candidate
Trader Score: (0)
 
Join Date: Jul 2014
Location: ca
Posts: 13
Default

Ok will start with pulling my belt and investigating. As for the idling. In All Gears (P, R, N, D 2, L) its always idled 0-150. Its never wanted to stall. Bought it like that, just figured the needle is off or something. Well actually maybe thats why I get the vibration/noise lol b/c it only does the noise when warmed up..


Quote:
Originally Posted by Twoforzero View Post
I had very similar problems (sc300 tho)

I agree with eknine9, haven't read that link but start by pulling your belt and investigate!! I checked the tensioner/pulley and my bearing was going but not that bad, slight "grainy" sound. Tension was fine. Wasn't satisfied.

Sooo...by accessories if you mean like turning your ac on you may want to pull the belt off and check your Harmonic Balancer. It might be skipping. The rubber that fails in between squeals when any excessive load such as using the Power steering, AC, or shifts in rpm will make it sound like a belt or p/s squeal. I believe this is also what caused my alternator to fail then eventually my maf went out(possibly unrelated and just failed over time as I do have 210k.) I thought it was my p/s and vacuum leak the whole time.

Replaced my HB which I found had come apart. Squeal AND Vibration GONE INSTANTLY!! Installed it along with a new gates belt, tensioner pulley (had to be done soon) and replaced alternator (regulator went out.)

Now for that ANNOYING IDLE ISSUE.
Couldn't fix above normal idle in P & N by playing with the tps or my throttle brackets or whatever you call them (where the throttle cables are held) without dropping down too low when I shifted into gear, almost stalling out at times. So after replacing vc gasket (I was there, had a slight leak so why not) plugs, wires, cap n rotor, and a thorough cleaning of the throttle body, iac valve, plenum butterfly, intake gaskets and replacing almost every vacuum line, I pulled the damn maf plug and nothing happened. I was suspicious. Bought a cheap used oem maf, replaced it, reset ecu and bam! No more weird idle issues! Still slightly higher cuz I played with the tps and throttle cable brackets earlier.

Tweaked both to where I felt comfy and now I have a steady idle at 850ish in P & N and when I shift into gear I drop to a steady 700.

Hope my experience helps! Have an awesome day!
scRuss is offline   Reply With Quote
Old 11-22-14, 01:07 PM   #9
eknine9
Lead Lap
Trader Score: (5)
 
eknine9's Avatar
 
Join Date: Mar 2012
Location: TX
Posts: 510
Default

Quote:
Originally Posted by scRuss View Post
Sc400 noise: http://youtu.be/5Wd_lW8qm2w

Yay!
Well I can tell you that is definitely NOT the harmonic balancer, and you're correct in saying it's not the power steering. I don't know what the belt tensioner sounds like when it goes out but hopefully somebody can chime in on that. I also remember reading somewhere here about the pulley bearings on the alternator going out and making a noise, but I had a hard time finding that when I searched. It's possible that could be the case, if so just remove the serp belt and try to manually rotate the alternator belt and see if it makes any noise or offers much resistance.
__________________
http://i1182.photobucket.com/albums/x455/eknine9/SCBanner.png
eknine9 is offline   Reply With Quote
Old 11-22-14, 04:15 PM   #10
scRuss
Driver School Candidate
Trader Score: (0)
 
Join Date: Jul 2014
Location: ca
Posts: 13
Default

Yes thank you. I will be checking after work tonight or in the morning. First going to adjust idle to spec, then proceed to the pulleys, tensioner, alternator bearing. Will keep yall posted


Quote:
Originally Posted by eknine9 View Post
Well I can tell you that is definitely NOT the harmonic balancer, and you're correct in saying it's not the power steering. I don't know what the belt tensioner sounds like when it goes out but hopefully somebody can chime in on that. I also remember reading somewhere here about the pulley bearings on the alternator going out and making a noise, but I had a hard time finding that when I searched. It's possible that could be the case, if so just remove the serp belt and try to manually rotate the alternator belt and see if it makes any noise or offers much resistance.
scRuss is offline   Reply With Quote
Old 11-26-14, 09:29 PM   #11
Twoforzero
Driver School Candidate
Trader Score: (0)
 
Join Date: Sep 2014
Location: Wa
Posts: 8
Beno Fool Twojaybee
Default

Ya disregard ny last post. I read mmmmm and thought squeal for some reason.

Anyways, ya it siunds like something is going on with your alternator. Espcially since you mention rpms being slightly assosiated AND when you turn your lights on, more load. Also, rpms are higher in p and n so thats prolly why its a lil louder then. I would have your alternator tested properly. Is it more noticeable only inside the vehicle? Do you have an aftermarket radio, subs or an amp? You could also have a grounding issue putting some added stress on your alternator. That added stress to the alternator, whatever it is be it bad ground, alt bearing, or belt is where i would guess the slight vibrations are coming from.

Hopefully this helped a bit more than my last post lol.
Twoforzero is offline   Reply With Quote
Old 11-26-14, 09:29 PM
 
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Steering Purr Michael LS400 17 02-18-14 02:26 PM
Vibration in steering wheel vultureskn Maintenance 16 08-11-12 04:41 PM
VIbration when turning at low speed gxgrappler GX - Second Generation 2 07-19-11 04:38 AM
Steering wheel vibration at 60 mph + sc400123 GS - Second Generation 12 12-12-08 02:59 PM
Oh no, I've got the vibration, i think? Rx900 GX - First Generation 11 06-04-04 10:20 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -7. The time now is 04:35 AM.

Join ClubLexus
Advertising


Copyright © 2000-2008 Internet Brands, Inc. All Rights Reserved
Privacy Policy | Disclaimer | Terms of Use | JOBS


Get all contact info