Inconsistent and sometimes abrupt transmission shifts

[TNTramair]

Guys cant the ECU or which ever computer controls when the tranny shifts be corrected? Or are we going to have to live with this JOLT??

Can somebody else weigh on on this? I know this has to bother a ton more people with later models

again...there is no ECU reflash for any type of shifting issue. there are also no TSB's in the matter. the only thing you can do is take it to the dealer and get it checked out to make sure there isnt anything else going on besides the norm. they will inform you if you have a problem or if what you're feeling is perfectly normal. please dont take that as them "giving you the run around" b/c if there was something we could do to correct the issue, we would do so.

unfortunetly there hasnt been a revision for the shifting therefore we cant do anything about it at this point. i would have done so to my own 05 4runner and would gladly post about the correction. if something turns up in the future, as im constantly lookin for something, i will gladly post about it.

 

[wis99ski]

It "Shouldnt" create any long term affects?? hmmmm...wish I knew this before I bought the new 4 runner!

 

[TNTramair]

It "Shouldnt" create any long term affects?? hmmmm...wish I knew this before I bought the new 4 runner!

we have dozens of 4th gen 4Runners coming in for various things and i cant remember ever having to do a trans in 1. some have well over 100k miles on them. hell, some customers never even change the trans fluid and still dont have any issues.

 

[nc211]

Would an adjust of the throttle position sensor help? I say this, because on the older Lexus LS400's "use to have a 95'", before cars got all wacky with this drive by wire stuff, when shifting got too harsh, it was a sign that a little more slack was needed in the throttle cable. What was happening is that the cable was too tight, which was communicating to the transmission's ecu that you were asking it to shift as if you were asking more from the engine "spirited driving", then you actually were. A turn or two of the cable nut on the throttle body would do the trick, and the transmission ecu would pick up on it and know that you were wanting to "cruise", not "haul butt". Maybe the underlying symptom of the older LS400's is the same here? Maybe the transmission computer is thinking you're asking it to shift quickly so you can get moving a lot faster than you want too?

 

[TNTramair]

Would an adjust of the throttle position sensor help? I say this, because on the older Lexus LS400's "use to have a 95'", before cars got all wacky with this drive by wire stuff, when shifting got too harsh, it was a sign that a little more slack was needed in the throttle cable. What was happening is that the cable was too tight, which was communicating to the transmission's ecu that you were asking it to shift as if you were asking more from the engine "spirited driving", then you actually were. A turn or two of the cable nut on the throttle body would do the trick, and the transmission ecu would pick up on it and know that you were wanting to "cruise", not "haul butt". Maybe the underlying symptom of the older LS400's is the same here? Maybe the transmission computer is thinking you're asking it to shift quickly so you can get moving a lot faster than you want too?

makes sense but the TPS is computer controlled...no manual adjustment that im aware of on these.

 

[wis99ski]

Would an adjust of the throttle position sensor help? I say this, because on the older Lexus LS400's "use to have a 95'", before cars got all wacky with this drive by wire stuff, when shifting got too harsh, it was a sign that a little more slack was needed in the throttle cable. What was happening is that the cable was too tight, which was communicating to the transmission's ecu that you were asking it to shift as if you were asking more from the engine "spirited driving", then you actually were. A turn or two of the cable nut on the throttle body would do the trick, and the transmission ecu would pick up on it and know that you were wanting to "cruise", not "haul butt". Maybe the underlying symptom of the older LS400's is the same here? Maybe the transmission computer is thinking you're asking it to shift quickly so you can get moving a lot faster than you want too?

Makes complete sense, I like it. But I dont want to mess with this throttle cable, I did that once before with a car and never had the right idle again until I changed my throttle position senor... I think an 08 4runner is more advanced then this

 

[nc211]

Makes complete sense, I like it. But I dont want to mess with this throttle cable, I did that once before with a car and never had the right idle again until I changed my throttle position senor... I think an 08 4runner is more advanced then this

I would certainly hope so, given it's 13 years newer. Some days, I wonder if all of this computerized mumbo-jumbo is any better than a standard cable, nut, bolt, butterfly setting. Folks have been trying to figure out the throttle set up of the post 1998 LS400's forever "this sensor, that sensor, this voltage, that ampage". Kind of miss the days of just turning a wrench and go...