7at issue not going away

Eris

Hello, friends... here again with more issues.

My 7at started shifting a bit funny when going from 3rd to 4th, in manual mode... eventually it started getting worse... at first it was just a strange feel, then it started shifting roughly and more quickly than usual... then the problem transferred to changes from 2nd to 3rd... and finally there was a clicking noise going from 3rd to 4th... not a clunk...a somewhat small click up front.

All this only ever happened when shifting with some noticeable load in the throttle... if I was just opening the throttle below 20% whilst shifting, it'd shift normally.

I was told here it might be as simple as transmission fluid change.

The dealership seemed to agree. They said it was that... and that the fluid was already degraded (at 29k miles).

I changed it. And so did I the diff fluid as well.

It worked... for 2 months...

Yesterday, the clicking and harsher changes came back... again from 3rd to 4th (in M mode)

This time I noticed out of nowhere a click and jerk whislt slowing down (I didnt downshift manually)... immediately after that, the problem was back... with a vengeance. The clicking is louder this time around.

Im confounded...
If the fluid wasnt the issue, why then did the problem ""go away"" the first 2 months after changing? What kind of problem can a transmission fluid change hide for just some weeks?

What could it be?

Asking here, lads, as I don't trust dealerships and they are not good at what they do.

Thanks for your time again.

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Eris

One thing I've noticed...

When the car is standing still, if I'm in drive, there is nothing to report... if im in manual mode (standing still), there is a whirring sound... always. Is that normal? Just pointing it out in case.

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Tractionless

Did you self change the transmission fluid? If so how many times did you run the car and then dump the fluid from the pan and refill?

When draining the pan it does not remove fluid from the torque converter and why multiple drain and refill's are necessary. If you only did it once try a few more pan dump and refills.

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Eris

Thank you Tractionless

took car to dealer for the transmission fluid change. It improved everything... except this

I have since taken the car to the dealership and tried recreating the issue for them and here are some findings:

In manual mode, 3rd gear to 4th gear... clicking noise sometimes incredibly faint, others louder, you can feel the vibration on the floor when it does. The sound appears to be coming from the transmission area... or at least up front. Not diff.

However, after it has been driving hot for a while, there is also a kicking or thumping acommpanying this, but this only happens if I try recreating the issue doing it over and over again after a while... it won't show together with the clicking the first 10 times or so... this thumping feels more like a differential kind of thumping (bushings are fine, z1 Motorsports urethane)

The weird part:

- ONLY does this from 3th to 4th
- ONLY if I change between 2k rpm and 4.5k rpm.
- ONLY if there is noticeable load on throttle ON these ranges..
and more if the load is less than wide open throttle. More so on a hill climb.

It:

-WONT do it if I change gears with a small load on any rev range
-WONT do it if I rev higher first and then change (with or without much load)
-WONT do it in D mode, just manual.

The dealership said the transmission is fine... and that the ticking noise may be a lose panel of sorts or something... but that wouldn't explain the sometimes thumping/kicking thaf it does with the same conditions as the clicking... the thumping/kicking they chuck up to the 7at not liking manual changes at lower RPMs from 3rd to 4th, with noticeable throttle load.

I've searched the forum and I've found VERY SLIGHT references to my issue with people pointing exactly that 3rd to 4th change is picky and obnoxious... and that one has to drag out 3rd and not short shift.

It feels a bit concerning even if everything else in the transmission feels perfectly fine and ive been told by 2 different mechanics the transmission is fine

Thank you

Sorry for long reply


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SouthArk370Z

Sounds like the transmission fluid level is not correct.

To set fill level by-the-book (FSM) requires Nissan's CONSULT equipment, the knowledge to use it, and the willingness to do the job properly. In my experience, most dealerships are lacking when it comes to the last two items.


Edit: A ticking noise can be caused by a rear wheel bearing not being set right. Might not be your problem but something to be aware of.

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Eris

Thank you. Apparently everything is fine... I'll get my car from the dealer today, see what they say.... it does the clicking after the car's been given a thrashing mostly... but that's the only symptom... and only does it if you lug the engine... which i don't do... you have to do it purposefully to get the ticking noise.

Everybody at the dealer and also at a shop i know have told me that the transmission feels absolutely perfect. But I can't be guaranteed that they used the CONSULT equipment or nor...unless I be or had been there.

The thumping, it hasn't done anymore... I suppose may have been a temporary glitch with the ecu perhaps.

Weird stuff. Its not the most unreliable car I've had but certainly the one with the most finicky situations.

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