I've had this valve-train-like noise for a few years now on my 96LS (240K) and it's getting worse and worse - it sounds like something is blowing or flapping when I let off the gas (standing next to the car, that is). I heard about some kind of recirculating exhaust pipe part, but I need more info on this (such as what it's official name is in these forums). Can anyone elaborate on what the part does and how to go about fixing it? Or better still show me a picture of the thing. Sorry if this is a dumb question but I have searched and searched but I still don't get what's going on.
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I believe its most likely an exhaust leak somewhere. My car is having the same problem and I'm going to take a look at it in a couple of days before I smog the car. Could possibly be the gasket from the block to the headers could have shot out, or from the header to the cat,
I think you're thinking of the EGR pipe. It's known to crack. I don't recall if it throws a code, but I don't think it would. There are alot of threads on the subject about how hard (or easy) it is to change. Here are a few. http://www.clublexus.com/forums/sear...archid=6608796
It's normally the lower pipe (25601-50060) that breaks at the concertina section,there have been success stories where the break has been welded but considering the pipe is quite difficult to remove and refit replacement may be the best reliable long term solution.
Another point raised was the break could be as a result of worn engine mounts causing excessive flexing of the pipe so it may be worth checking these as well.