Odd Super Loud Rumble 1300 rpm 2008 LS 460
04-17-23 | 11:24 AM
#16
6th Gear
Joined: Aug 2022
Posts: 6
Likes: 3
From: SC
Solved the issue with help from you guys.
My car started doing the exact same thing a week ago without any warning lights. It happens when transmission is in a high gear and RPM is around 1300 to 1500 rpm with very slight/steady state pressure on gas pedal (flat road, usually going 40-50 mph in a high gear.) If I give it even slightly more gas the rumble goes away. if I give it less gas the rumble goes away. if I keep the gas exactly the same then shift it in to manual it goes away. Was anyone able to find the cause of this issue?
I need to reiterate that this is a serious whole car heavy bass sounding rumble which can be felt throughout the car. it's not coming from any of the 4 corners. after trying to diagnose it while driving for the last week there is a very specific set of variables that needs to be met when it happens as stated above.
I'll check my engine mounts tomorrow since i'm off work. I was thinking the rotary-dirdir was to blame or maybe my headlight fluid was low again. i've already fixed/replaced so much crap on this car. when it's working it's awesome. when this type of **** happens I grow tired of lexus engineering very quickly.
Any input would be greatly appreciated!!!! A Flatout problem-solved fix would be godlike! I haven't hooked my techstream to the car in a while (4 months) because there are no lights in the dash.
I need to reiterate that this is a serious whole car heavy bass sounding rumble which can be felt throughout the car. it's not coming from any of the 4 corners. after trying to diagnose it while driving for the last week there is a very specific set of variables that needs to be met when it happens as stated above.
I'll check my engine mounts tomorrow since i'm off work. I was thinking the rotary-dirdir was to blame or maybe my headlight fluid was low again. i've already fixed/replaced so much crap on this car. when it's working it's awesome. when this type of **** happens I grow tired of lexus engineering very quickly.
Any input would be greatly appreciated!!!! A Flatout problem-solved fix would be godlike! I haven't hooked my techstream to the car in a while (4 months) because there are no lights in the dash.
So it was infact the lockup converter. The fluid was so worn out that there wasn't enough pressure being built up to fully enguage the lockup in overdrive. Solution was to do a complete flush of the 12quarts of transmission fluid through the cooler lines. It was as black as charcoal. That being said it had 240,000 miles of usage. But no more shuttering. Problem solved for 400 bucks. At a toyota stealership. I figured the $200 dollars I would have saved wouldn't be worth the aggravation. I stand by that decision. Lol. Good luck to anyone else with the same issue.
Thank you guys!
04-17-23 | 02:04 PM
#17
Pole Position
Joined: Oct 2002
Posts: 3,199
Likes: 48
From: Michigan
So it was infact the lockup converter. The fluid was so worn out that there wasn't enough pressure being built up to fully enguage the lockup in overdrive. Solution was to do a complete flush of the 12quarts of transmission fluid through the cooler lines. It was as black as charcoal. That being said it had 240,000 miles of usage. But no more shuttering. Problem solved for 400 bucks. At a toyota stealership. I figured the $200 dollars I would have saved wouldn't be worth the aggravation. I stand by that decision. Lol. Good luck to anyone else with the same issue.
Thank you guys!
Thank you guys!
05-13-24 | 07:57 AM
#18
Driver School Candidate
Joined: Feb 2009
Posts: 15
Likes: 4
From: Florida
The following users liked this post:
Marc780 (05-13-24)
05-13-24 | 09:51 AM
#19
Lexus Champion
Joined: Oct 2019
Posts: 12,192
Likes: 1,277
From: Ohio
I have seen this many times and as said it's fluid sheer-down allowing too much slip in lockup, will feel and sound like rolling over rumble strips.
The AA80E is NOT a lifetime fill and there is very much a limit to pressure adaptation that once exceeded you will have this happen or start experiencing very strange shifts. You can see the adaptation values in TS/a dealer level tool and it will be obvious that the car needs to adjust for old fluid, when replaced the values will all settle in much closer to +0 pressure. I have yet to see any transmission have truly zero wear as all will have some sort of adaption, even a 650E
Oh and that's why I also suggest a synthetic version of WS, much longer life and will not sheer down nearly as quickly
The AA80E is NOT a lifetime fill and there is very much a limit to pressure adaptation that once exceeded you will have this happen or start experiencing very strange shifts. You can see the adaptation values in TS/a dealer level tool and it will be obvious that the car needs to adjust for old fluid, when replaced the values will all settle in much closer to +0 pressure. I have yet to see any transmission have truly zero wear as all will have some sort of adaption, even a 650E
Oh and that's why I also suggest a synthetic version of WS, much longer life and will not sheer down nearly as quickly
Last edited by Striker223; 05-13-24 at 10:01 AM.
The following users liked this post:
Marc780 (05-13-24)
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