A650E auto tranny possible problems SC400 vvti
#1
Pole Position
Thread Starter
iTrader: (3)
Join Date: Sep 2009
Location: Mantelli Drive, CA
Posts: 302
Likes: 0
Received 0 Likes
on
0 Posts
A650E auto tranny possible problems SC400 vvti
I've always thought my tranny shifted werd. When driving very slow and keeping the rpms below 2000, the tranny is already shifting past 1st, 2nd, 3rd. Is this normal? I don't know if I'm explaining this correctly, buy say I'm accelerating from a dead stop and keeping the rpms below 2k, you can already hear the tranny shifting several gears already. And right when I'm at 30 mph, I'm on 4th already. The cel light is on too by the way but at first I thought maybe it's from my exhaust "h" pipe setup. Now I'm wondering if it's a shift solenoid from the tranny? When I punch the throttle, everything shifts perfectly though.
Last edited by scfou; 12-23-09 at 01:44 PM.
#2
Lexus Test Driver
iTrader: (7)
Join Date: Oct 2006
Location: SoCal & SLOcal
Posts: 927
Likes: 0
Received 0 Likes
on
0 Posts
Get the code and that'll tell you where to start looking, I really doubt the CEL is from an H pipe unless you removed the cats.
As for the transmission that sounds normal to me. My car will be in 3rd gear by 30mph driving slowly like you said. But then again, my car has only 4 gears, while yours has 5.
As for the transmission that sounds normal to me. My car will be in 3rd gear by 30mph driving slowly like you said. But then again, my car has only 4 gears, while yours has 5.
#3
Pole Position
Thread Starter
iTrader: (3)
Join Date: Sep 2009
Location: Mantelli Drive, CA
Posts: 302
Likes: 0
Received 0 Likes
on
0 Posts
Get the code and that'll tell you where to start looking, I really doubt the CEL is from an H pipe unless you removed the cats.
As for the transmission that sounds normal to me. My car will be in 3rd gear by 30mph driving slowly like you said. But then again, my car has only 4 gears, while yours has 5.
As for the transmission that sounds normal to me. My car will be in 3rd gear by 30mph driving slowly like you said. But then again, my car has only 4 gears, while yours has 5.
#4
Lexus Test Driver
iTrader: (7)
Join Date: Oct 2006
Location: SoCal & SLOcal
Posts: 927
Likes: 0
Received 0 Likes
on
0 Posts
You shouldn't have gotten a CEL after the exhaust work if all they did was the rear portion of the exhaust. I had 2 resonators removed, and the 3rd cat removed as well. Absolutely no CEL for me, and my car is OBDII. Maybe there is an exhaust leak near the O2 sensors. That happened to me one time.
Definitely check what code it is because I don't think it should be throwing a code in your case. As for the laggy shifting, you can blame that on the 4th solenoid in the transmission. ALL sc400's had this, not 300's did not. That's what reduces power to the wheels and gives you that nice slow "Lexus" shift.
If you wan't to disable that lag and make it shift hard and fast, just follow this link.
https://www.clublexus.com/forums/per...-its-free.html
It gets better and more understandable when you get to the 100+ posts
I'm currently trying to get it to work without throwing a CEL transmission code. I'm pretty sure I've got it down, just need to actually try it.
Definitely check what code it is because I don't think it should be throwing a code in your case. As for the laggy shifting, you can blame that on the 4th solenoid in the transmission. ALL sc400's had this, not 300's did not. That's what reduces power to the wheels and gives you that nice slow "Lexus" shift.
If you wan't to disable that lag and make it shift hard and fast, just follow this link.
https://www.clublexus.com/forums/per...-its-free.html
It gets better and more understandable when you get to the 100+ posts
I'm currently trying to get it to work without throwing a CEL transmission code. I'm pretty sure I've got it down, just need to actually try it.
#5
Driver School Candidate
Join Date: Jul 2009
Location: So. CA.
Posts: 16
Likes: 0
Received 0 Likes
on
0 Posts
Ok sounds like we have the same tranny problem. Did you find a fix? Please let me know.
My 92 sc400 also shifts weird and I hate it. Goes from 1st to OD way to early. After I drive for about 30 min on the freeway, it fixes itself. Then shifting problem happens again at start up even if car is warm. The problem sucks. But when it shifts normal again, I am so happy. I've done a professional transmission flush and thought that would fix it, but it did not.
Sometimes it just skips right over second gear and sometimes it lands on second for a split second and goes to 3rd and then 4th almost right away so I have to manually shift into 2nd gear in order to accelerate. But I think when I shift into second, it actually goes into 3rd. ARGGGG anyone fixed this problem?
Oh, BTW there is NO check engine light on. So whatever the problem is, it is not throwing any kind of code that I know of. (and yes my CEL does work) lol.
My 92 sc400 also shifts weird and I hate it. Goes from 1st to OD way to early. After I drive for about 30 min on the freeway, it fixes itself. Then shifting problem happens again at start up even if car is warm. The problem sucks. But when it shifts normal again, I am so happy. I've done a professional transmission flush and thought that would fix it, but it did not.
Sometimes it just skips right over second gear and sometimes it lands on second for a split second and goes to 3rd and then 4th almost right away so I have to manually shift into 2nd gear in order to accelerate. But I think when I shift into second, it actually goes into 3rd. ARGGGG anyone fixed this problem?
Oh, BTW there is NO check engine light on. So whatever the problem is, it is not throwing any kind of code that I know of. (and yes my CEL does work) lol.
Thread
Thread Starter
Forum
Replies
Last Post