Is300ftw

Hey is300 owners out there assemble lol
I'm having a issue with my car I'm hearing a loose or bumpy sound coming from my rear driver side
I'm on Megan coils FYI. It's like almost every bump or crack in the road it makes the sound on a smooth road there's no sound. I can't pin point the noise the best example I can say the noise sounds like is that kinda soundwhen a exhaust hanger is loose and the exhaust is rattle but I lifted the car and it was not the exhaust. Please help
I drive a 2001 is300 automatic

tjmhillz

iTrader: (6)

Could be a broken coil or a loose bolt and everytime you would hit a bump it would make that noise.

Is300ftw

Yes every single time it's doesn't miss a beat

Is300ftw

Yes every single bump I hit

FPSee

i read that megans are a bit noisy over bumps?

Is300ftw

Yea I've always had Megan's this is more like a rattle then a regular noise it sounds like something is loose

Lextrd016

It's funny you posted this I have the same thing happening to my BC coils its on my driver side making the same noise I haven't looked into it I'm thinking maybe the locking mechanism is loose?? I hope it's not a broken coil..

Is300ftw

What else could it be I'm like totally lost it sounds like its coming from the middle but it also sounds like the back as well

Is300ftw

Update** it's the upper pillow ball mount that wasting the noise

Lextrd016

What does that mean and how did u get it fixed?

Is300ftw

https://www.clublexus.com/forums/gs-...per-mount.html. Copy this to your URL and you'll see what I mean

BernieIS

iTrader: (1)

The issue all of you are having is that you did not preload the coilovers correctly.

This courtesy of Circuit Motorsports

The proper way to set preload on a coilover-

-Loosen both lock rings under the spring (spring seat ring(top) and spring lock ring(bottom)) so that the spring is loose and can move up and down slightly.

-Tighten up the spring seat ring so that the spring is snug, but do not tighten it down past simply holding the spring snug, this will be "0" preload.

-Now bring the bottom lock ring up so that it is just touching the spring seat ring, but do not tighten to lock, you will be moving the spring seat ring next.

-Now tighten up the spring seat ring so that you are now preloading (compressing) the spring.

-Measure the distance between the bottom ring and the top ring as you are tightening, once there is a 3mm gap between the two rings, you have 3mm of preload on the spring.

-Tighten up the lock ring to lock your preload in place

-Repeat for all 4 corners.



You also want to check and make sure the top 17mm center nut is tight, it's best to check it with an impact gun if you have access to one, a wuick hit is all it should need. A few other areas to check are the lower mounting bolts, the 4 allen bolts that adjust camber, and the 4 lock bolts underneath the pillowball bearing, make sure all of these are tight.



Sometimes noise can come from somehwere else, endlinks, swaybars, and chassis contact can all be problems. Make sure now that the car is lowered and stiffer that you don't have exhaust contact anywhere. These are all common noise issues.


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