QUOTE(nc211 @ Sep 5 2008, 12:30 PM)

Your problems:
1) The thump you feel in the back, matched by a "defective" wheel in the front right, makes me think you probably hit a pot hole at some point prior to your last tire rotation, and it probably tore the rear carrier arm bushing. It's actually quite normal on all cars for some suspension bushings to wear out after 6 years "the rubber starts to crack". But I agree is a bit early for a SC430 with 40k. Bushings seem to be more sensitive to age than to mileage. Your warranty should of covered this.
2) Engine won't idle when it's cold? What do you mean? Are you saying it idles high, like in the 1,600 rpm range? Then settles back down to normal area around 500 rpms? If so, that's not a problem, that's a requirement of all cars today, thanks to the EPA. All cars idle high when cold so they warm up faster. A warm engine produces less pollution. But, if that's not what your car is doing, and just dies or you have to hold the idle with the gas peddle, then again, it's a warranty item "probably the TPS or MAF sensor". Again, basic parts that simply do wear out on all cars.
3) Sulfur smell from exhaust: No arguments here from me. 4runner owners, GX470 owners, LX470 owners, Tundras, and even a couple LS460 owners have been complaining about this FOR YEARS! Especially the 4runner owners! I have an 05' V8 4runner that can make your eyes water under a heavy foot with the back window down. I agree, Toyota has a company wide problem with their cat's about this. There are TSB's issued to replace the cat's with different ones "at least on the 4runner there is" that seem to fix it. It's covered under the company-wide emissions warranty of 8 years or 80k miles. I haven't fixed mine, simply because I like it, it's a great trick to get tailgaters off your bumper! Nothing like a 4.7 Liter fart in your face to make you go away! But, in a convertible like yours, I can see where that might be too much to handle. Toyota says it's "fuel related", and to some degree it is, but not completely, unless you're putting in Paris Hilton fuel which makes everything smell "hot".
4) The new water pump/timing belt/ etc... I have to say, that's a buyer-beware situation man, as it's clearly stated in your owner's manual maintenance schedule to be done (either at 90k miles or 72 months). Now, having Lexus tell you to do it or void the warranty, that sucks, and I can see where you'd be ticked! But, it's part of the maintenance of the car too. I'm sure your timing belt and pump is probably fine at those miles, but age also plays a bit factor. In my opinion, not doing the service after 6 years of service, is no different then not doing it at 90k miles. You run the risk of the two parts wearing out. Most cars require this (at least all the ones I've owned over the years, including Nissan products-2 of them). If not the belt "chain driven", the waterpump for sure. But, I agree, you might be getting hosed a little bit there by the dealership. Hey, some are called "stealerships" for a reason.
5) Trim pieces: What can I say? It's plastic on a piece of machinery that takes a lot of abuse over it's lifetime. Sh*t happens man. Two pieces of plastic wear out on a car with a gazzillion parts working in harmony, ain't that bad really. Ever own a Chevy? Even the new $50k+ Tahoes and Diesel trucks have major problems like that, with 1/100th the miles.
If you think Nissan's any better with their Infiniti badged G37....I hate to say it, but that thing won't be even close to the SC430. Granted, it may not stink like someone just dropped one in your lunchbox, but you can bet, you can absolutely bet, that you'll be dealing with a "broken fan blade in the a/c blower in the dash" type stuff. Brake rotors that cost several hundreds of dollars a piece, rattles to start to show after about 10k miles, thanks to their stiff ride and cheaper insulation materials in the suspension arena. They're nice, but they're nowhere near the quality of build of a Toyota. Heck, not too many things are. The two I've had personally (92' Sentra SE-R & 2001 Maxima SE) weren't the same car after the first 12k miles. My dad has that minivan of thiers "can't think of the name" and he's had to replace the a/c motor twice due the blades braking, along with several modules, and I can't tell you how bad that thing rattles. It has 35k miles. They all seem to get louder on the road too. Lots of road noise seems to creep into the cabin over time, even with new tires. A co-worker of mine has the G35 Coupe, and that thing is the biggest POS on the road! Granted, it looks good out there on those California roads, but that utter piece of monkeydung is always broken. Either won't start, or the rotors warp so badly they can't be turned, or the radio shorts out the windshield wipers, or the heated seats won't turn off and drain the battery, or the security system activates on it's own and shuts the car down while she's going down the freeway....it's just one thing after another. Last I hear, she traded it in for an Audi 4. Now...THAT says something when you trade for an Audi!
But, I understand your frustration, I really do. However, I think you're letting your frustration spill-over to Lexus in general. They're not perfect, but nothing is. They're about as close as you can get though, in my opinion. I think that's one of the problems with Lexus. So many years of advertising slogans of "pursuit of perfection" makes people think they're perfect. When in reality, they're just cars, that take several thousand hard bumps, debrie, abuse, neglect, harsh weather conditions, time and time again. Things wear out, especially after 6 years of life. Don't believe me? Wanna' see my hairline at 35 years of age? That's proof enough!
NC,
The problems I listed are items that were repaired under warranty. The wheel was a defective wheel that leaked air over time. The clunk in the back was fixed by replacing something that was covered in a service bulliten, same with the speakers. The trim piece was a metal piece (painted) on the ouside of the car that didn't fit correctly. Wiper motor was defective from the start, just took two trips for them to admit it and fix it. None of these are really big deals (except the rotten egg smell). It was just stated that my problems with the car were "Mythical" so I listed them. BTW, I'm 62 years old and have owned at least 30 cars and trucks (not to mention Motorcycles) in my life. I miss the days when I could work on them myself. Anyway, based upon my many years of experience I'm going to stick by my opinion that Lexus isn't a good value. I'm not saying they are a bad car, just that they aren't worth the extra cost. And Lexus dealers aren't any different that any other dealers (except may Ford). On a final note, I'm not getting the G37. I'm in discussion with my local Nissan dealer on a GTR. He has two more coming that aren't sold but I'm not going to pay $30K over sticker. As they get closer to getting here and he doesn't have them sold I'm hoping he will get a little more realistic on the price.