Grinding noise on deceleration

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Jan 30, 2007 | 09:36 AM

utexas112

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Grinding noise on deceleration

Hi everyone

My "new" car is currently at TLC in san diego getting looked over. Its a 1995 LS400.

I was just curious.. and after a search I see this is a more common problem but there was no consensus on a resolution.

Anyway, when I am slowing down from about 20-12 mph I get a grinding noise as the transmission seems to shift from gear 2 to 1. Anybody know the fix? Transmission fluid was clean and pink.

Thanks
PS - its definitely not coming from the brakes.

Jan 30, 2007 | 09:44 PM

Thermactor

Lexus Test Driver

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Interesting. I get a grinding noise when I first start my car in the morning and it sounds like it's coming from the transmission too.

Jan 31, 2007 | 09:41 AM

utexas112

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Anybody got any clues on this? The mechanic is talking about ripping the transmission apart to check the parts!!!AHHH!!!

He then recanted and recommended a tranny flush and refill with type IV fluid... perhaps someone changed the fluid and used the wrong type? Could this lead to a grinding when the transmission downshifts from 2-1?

Jan 31, 2007 | 06:31 PM

utexas112

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***update***

Thus far, after a transmission fluid flush the problem is gone... the culprit may have been a previous transmission fluid change using the wrong fluid. I will update the thread if the scenario changes. Cross your fingers!!

Feb 4, 2007 | 11:09 AM

utexas112

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Problem has occurred a couple of times since the flush. Its quite strange, almost as if the transmission doesn't want to downshift.. you know, like the feeling when you are in a manual car and you are going too slow for the gear you are in.

Anyone have any other ideas what it may be? I may perform another fluid change as that seems to have "nearly" cured the problem.

What about resetting the computer by disconnecting the battery for a while?

Feb 4, 2007 | 11:18 AM

PureDrifter

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try resetting the ecu.

is the car throwing any check engine codes?

Feb 4, 2007 | 11:24 AM

utexas112

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Yes, it is now throwing some check engine codes, but the problem was consistent before they came up.

I think they are probably completely unrelated. The codes that were thrown, per the dealer, are coming from the cats.

Can't wait until I have all of these minor issues settled. As a whole the car is really coming together. Generally drives like its brand new.. smoothe as glass on the highway after the new tires.