SandorH

LS400 1996 65K weird noise

Recommended Posts

https://youtu.be/zDw5gf5n5as
https://youtu.be/TlzeD4twnSs

Hi. My LS400 (1996 65K miles) sometimes feel like it is losing power and has a weird noise (sounds like an RC car) when it is speeding. I checked the engine controller which was in pristine condition, but to make sure everything is all right I changed the condensators to the recomended ones. It also had a major service yesterday to keep it in shape (oil system flushed, fuel system cleaned, oil changed, filter changed, front wheels balanced...), but this issue is still present. Is anyone had the same before?

Share this post


Link to post
Share on other sites

Welcome to the LOC.

I can’t see the problem from the videos.

Share this post


Link to post
Share on other sites
35 minutes ago, steve2006 said:

Welcome to the LOC.

I can’t see the problem from the videos.

Hi. Maybe the sound quality is not the best. Before this problem and when it's working properly like before, the car is way much smoother and has no scratchy bearing noise. You can hear it slightly on the video and it is way more louder on higher speed. I was looking around and it is possible to be the pulley or water pump, but I'm not a mechanic so want to make sure

Share this post


Link to post
Share on other sites

at 24 years old it could be many things age related and not miles related

has the waterpump ever been changed ?  it's a big big job and owners might have shyed away from cambelt, pulleys and waterpump stuff coz of the low low miles

but 10 years is the time for it, at least a proper inspection or diagnosis however tricky that might be

Malc

Share this post


Link to post
Share on other sites

As above, if it is the water pump it needs doing immediately as it could wreck the cambelt, then you're sunk!  You could remove the auxiliary belt (easy job) and briefly run the engine, if it stops being noisy you know it's not the water pump.

Share this post


Link to post
Share on other sites

I could hear the noise on one of the videos, and does seem to change with the revs.

Interesting that you said it is not as smooth as before, as my guess might be transmission issues, but not sure what you mean by smooth/scratchy

Do you get the same noise if you get to speed, then put the car in neutral and then rev the engine.  If noise is still there then I would be thinking water pump / cam belt problems.

 

Share this post


Link to post
Share on other sites

Yup.  I can hear the scratchy noise too on your video. Changes pitch with revs. My best guess is one or more of the sealed ballbearings inside the stuff on the motor front that has persihed. 
I have done cambelt and  auxiliary belt, water pump and idler bearings on two LS400 age 20 and 22 years . Some of the auxiliary belt bearings were stil working ok but made some "whirring" noise and grease inside more resembled black cheese then oil. If this is the case with your car the noise would have come gradually over some time.
20 Years is a descent life on those sealed bearings I think. If it is due ,  Do the full Cambelt, water pump, All idlers bearing change. My alternator bearings, freewheeling bearings in AC-compressor, and Fan bearings  I did not change . Those where smooth running, tight and seemed fine still.    

Share this post


Link to post
Share on other sites

Sandor, did you get to the bottom of the issue ?

Malc

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.