Lexus SC430 :: Shakes When Idle And At Stop Lights - New Motor Mounts?


Apr 20, 2012

I have recently had my motor mounts and transmission mount replaced.

Before the replacement, the car would shake quite noticeably when the engine was being started (maybe even shake 'violently'). I thought this was normal until I had my motor mounts and transmission mount replaced. Now when I start the engine the SC430 doesn't shake at all. The difference is profound.

Just a head's up. I'm not sure what the implications are of running with bad motor mounts for a long time, but I decided to get it done because my car would shake when idle and at stop lights.

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- When sitting at idle, the car vibrates. I can feel it through the brake/gas pedals and steering wheel. I didn't notice it prior to the UM tune. It's like an undulating feeling even more than a vibration.

- When upshifting, I now seem to get a clanging sound/feeling if I upshift anywhere less than about 3200 RPMs. It doesn't always happen, and it won't happen if I'm really fast with engaging the clutch after taking my foot off the gas. But it is disconcerting.

Prior to the tune, I had gotten used to the sort of bucking and whatnot when you let off the gas and learned how to shift to minimize it. But now it isn't as easy to do a mellow, smooth upshift under 3000 RPM's...i.e. if I just want to pull away slowly from a stop. My question is, do these sound like symptoms of bad motor mounts? The car has just under 25k miles on it. The mounts are all stock. I was wondering if the UM tune was just enough extra power to put one or more of them over the edge.

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Accelerates catalytic converter damage

BUT are there any other risks in case of damage on the long term?

What the ECU will do in case of a faulty 02 sensor? Will our Lexus order a rich fuel mixture to prevent heating problems or are we also running the risk of a poor mixture?

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I recently found out my motor mounts are bad. Almost a year ago I noticed I was leaking coolant so I just filled it with water every time it was empty. Now I have been getting an overheating problem if it's not filled to the right amount. Just yesterday the problem got worse as there is green gunk at the opening of the radiator and it's always hot. The reservoir is filling up with hot water a lot of the time. My radiator will be empty when that happens. As I was driving the gauge was reading hot. Turning on the heater didn't work much. I tested it tonight, with the radiator full and 2 cups water in reservoir. Drove it a few blocks and turned off car. Radiator had lots of pressure and hot. The reservoir was same level.

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So ever since i put stiffer motors mounts in my car, the trans has whined. It was perfectly fine before the new motor mounts.

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4th gear seems to be the worse. This is not my daily driver so i can live with it, but if it was my daily i would be annoyed and probably but the stock mounts back in. While on the road course i do not hear it because i am at high RPMS and the noise isn't really there (well it might get muffled by the sound of the engine but i hear no whine)

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