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Hello All, new to this forum, and to the whole Lexus/Toyota ecosystem in general, so pretty much everything is new to me. But I learn quick
Anyways, here's what I found on my IS 250 yesterday.
For a couple of days prior, I was experiencing a lot of knocking coming from the bottom end of the car, it sounded like something is lose there, and it's especially auditable when cornering and going over bumps.
I thought it was something with the suspension on the rear end because it was constantly going "clunk-clunk-clunk" regardless of speed.
Then I went to a mechanic, we lifted the car on one of those platforms, and started investigating on the bottom of the car, and the suspension, apparently, it turned out that the suspension is flawless, and at the first glens, there was nothing wrong or lose there.
So we wondered for a bit(me and the technician) we literally started shaking the whole car, and everything underneath it till we hear the clunk I was telling him about.
And then all of a sudden, we found this....
This metal bar at the middle of the diagram, with the highlighted part number.
The exhaust pipe that is going above it, is touching it, and thus, constantly knocking into it.
So we simply removed it, and the knocking is gone for good.
However, I cannot see a reason for this bar to be there at all, let alone touching the exhaust system/piping, and the pipes are not bend in any way, or in any risk of ever falling off, or anything.
So why is this metal bar even there to begin with?
Are there supposed to be anything between this metal bar, and the exhaust system so it's not a bare metal to metal contact between them?
These being a unibody, they flex some and that little bar is there to help minimize that.
You likely have lost one or more rubber insulated exhaust hangers allowing it to drop lower and hit that brace. I suggest you get it back in the air and take a look as well as return the brace.
These being a unibody, they flex some and that little bar is there to help minimize that.
You likely have lost one or more rubber insulated exhaust hangers allowing it to drop lower and hit that brace. I suggest you get it back in the air and take a look as well as return the brace.
Has the exhaust been replaced? Welded on?
Nope, the exhaust is not replaced or welded anything, it's still rocking the stock exhaust, with the stock rubbers and everything.
We already inspected it, and nothing is lose, none of the rubbers are gone, they are all there, but it was interesting to me why they left it like this, a bare metal to metal contact with nothing in between to isolate the potential vibration, thus causing a clunk when going even through the smallest cracks on the road.
Nope, the exhaust is not replaced or welded anything, it's still rocking the stock exhaust, with the stock rubbers and everything.
We already inspected it, and nothing is lose, none of the rubbers are gone, they are all there, but it was interesting to me why they left it like this, a bare metal to metal contact with nothing in between to isolate the potential vibration, thus causing a clunk when going even through the smallest cracks on the road.
That's just it, it is not metal to metal for 99.5% of the cars out there. Something isn't right.
Look just past the resonator, see the two hangers? Each muffler also has two hangers...
Yes, I can see the same things on mine as well, problem is that the exhaust pipe is touching this metal bar for some reason, and as I can see, it's almost touching yours too, there's less then an inch clearance, so I guess over time, it will touch it to you too.
What I'am looking for is to perhaps put some isolation material on top of this metal bar, rod, or whatever to simply mute the banging sound
As the above post states, I would replace the hangers. On a different car I backed into a raised parking stop, slightly bending the exhaust and stretching the hangars. To fix it they heated the exhaust pipe to bend it back in place then replaced the hangers
Nope, the exhaust is not replaced or welded anything, it's still rocking the stock exhaust, with the stock rubbers and everything.
We already inspected it, and nothing is lose, none of the rubbers are gone, they are all there, but it was interesting to me why they left it like this, a bare metal to metal contact with nothing in between to isolate the potential vibration, thus causing a clunk when going even through the smallest cracks on the road.
did removing the bar do anything to the car? I also see no purpose for it and was thinking of removing it or just adding washers to space it out for clearance.
It didn't affected anything as far as I'm concerned.
I haven't felt any difference in the driving, or handling of the car, a part from the knocking that is gone now
You guys need some sorbothane there for vibration damping solution perhaps it may need a spray of high temp silicon spray so it doesn’t get completely melted from the heat.
Weird knocking sound
perhaps it may need a spray of high temp silicon spray so it doesn’t get completely melted from the heat.
