I have an 04 LS 430 and have an ocassional issue i can't figure out. Under normal conditions the car shifts and drives fine even when it is cold but at times if i drive it a little more aggressively I get a bogging feel. If i have to accelerate heavily and then come to a stop i get a slight jerking feeling and some major hesitation trying to build up speed. When i experience this issue and get home to park shifting from reverse to drive causes a jump up in rpm and a quick plunge in rpm followed by a sudden jerking feeling. I have no lights on at all and really have no clue as to exactly what it could be. I can go weeks without the issue and sometimes it happens twice in a week. Has anybody else experienced a similar issue?

 

Sounds like my issue. Jury's stll out whether this is slack in the transmission or perhaps the ECU.

 

Have you taken it to a shop?

 

Shops are useless, in my experience. Even the local Lexus expert couldn't help me with basic suspension issues.

 

Fluid level? how old?

 

So the problem happens after you drive aggressively. It's heat related. I worry that it's an ECU's soldering crack issue.

 

this. +1

 

I feel like sending my ECU in for repair just because that seems like the easiest and least costly thing to try, after having replaced my engine mounts.

 

100% agree. I dread taking my LS Into a shop and I refuse to go to a Lexus dealer

I have the same issue and I think the general consensus is it's cracked solder joints on the ECU. Seems like a fairly common problem with the LS

 

So what's the tried and true place to send for ECU repair and how quick is the turnaround?

 

i've yet to try myself but I think SIA is one i've seen on the forum most.

https://www.ebay.com/itm/Lexus-LS430...72.m2749.l2649

or

https://siaelec.com/