REG99GS3

Has anybody had a slight kick(hard shift) when accelerating from a stop light?? I'm trying to diagnose the problem but i don't know where to start. I have clean transmission fluid. it dosen't do it all the time mostly on strong accelerations.Anybody have this problem??

bmgs400

Are you trying to run hard on a cold engine/tranny? The computer will hold 2nd gear longer when the engine/tranny hasn't warmed up. Do a search in the Transmission forum and you'll see lots of threads on this topic.

REG99GS3

tranny is running temp,not cold. Weird, i Just don't want to get jerked by a mechanic. usually Lexus doesn't have tranny issues.

Straight6

iTrader: (2)

have you checked your tranny mounts?

GeorgeGS4

lexus' have MINIMAL problems with trannys from my experience. I sometimes get a hard downshift while pulling into my driveway after driving her hard, which i think is caused by the low idle problem.(or she's just pissed 'cause I was beating on her ) is it downshifting hard too, or just hard upshifts??

eman88

iTrader: (2)

I have the same problem,, but when starting from a dead stop (starting off slow) I feel a noticeable shift / pull in first gear, if I accelarate a little harder (moving with / ahead of traffic) I dont feel anything every gear change is smooth. maybe I'm over reacting

Machog

I had a similar thing happend a couple of months ago. It turned out to be a loose battery lead-yes I am serious! When I pulled away the engine would flex in the mounts, the battery would not and the movement in between the two was enough to "stall" the engine for a millisecond and cause a transmission jerk.

When I checked the terminals on both + & - were loose. It costs you nothing to check and mine has been back to flawless for the last couple of months.

Machog

minla007

hey man, i noticed the same thing on my gs4 the other day....when i am at a complete stop or going very slowly and then hit the gas....the tranny seems to jerk when it is shifting into the next gear.....hmmm...im gonna have my mechanic check it out.....lemme know what you find out and ill do the same...

phantastik

i had the same problem on the second gear so i took it to ammco transmission they did their little diagnostic it took them like 4 days to do this. then they tell me a whole bunch of stuff thats i didnt understand abou the oil being dirty and that certain parts need it to be replace well i know that i it was gonna come out to like 3 grand so i was like oh my god i had a extended warranty and they suggested to get a used tranny they had from another GS i`ve never checked to see if they actually did change the tranny but it works fine now and im happy with it

minla007

so you don't knwo what they did to your tranny? did the dealership do the work or did u let aamco do it? just curious.

eman88

iTrader: (2)

seems like when the car warms up. the problem / issue is gone.....I'll keep checking every day

bmgs400

Search = cold tranny warmup ... here's links:
https://www.clublexus.com/forums/sho...+tranny+warmup
https://www.clublexus.com/forums/sho...+tranny+warmup

REG99GS3

thanks for the help, my car is getting painted now (065-white gold cyrstal) i am making a list of my mechanical issues. this is at the top of the list.

skeet94

This normally happens on my Aristo whenever I'm in traffic, but I've noticed that if I turn off the power mode it doesn't seem to "jerk" forward. Do you have your power mode set to on when it does this? Under normal I don't get any of it.

steindawg

Skeet I seem to have a similar issue...mine seems to buck at me on occasion when I am off the gas, but not on the brake...but as with you it seems to behave better if I turn off the power mode..did you figure out anything as far as a cause?