Hello
My name is Tim
i'm owner of 2009 G37 coupe
few days ago i had a feeling of "clutch slipping" on 6-7-th gears
any ideas?
140.000 km = about 90.000 miles

 

Stock power? or Significantly upgraded?

 

Stock power

 

Bad speed sensor? Dirty fluid? Bad valve body? So is the rpm surging for a bit before the tranny grabs a hold of the next gear? Easily replicable?

 

Service center guys connected with computer and they suggest to change the transmission!!!
They suspect the grabs are weared...
Today 5-th gear started to slipp as well
It seems like its in neutral
After 20-30 second of slipping it goes to "safe mode"
Do you think its possible to fix it?
Or should i order used transmission from USA?
The problem is that only 25 Coupes in Israel
No parts here

 

Valve body, torque convertor issue maybe. Hopefully it's not the clutch packs. Could be the programming too, I would try the TSB reflash before anything.

 

I will try TSB reflash one more time
They did it 2 weeks ago after i got first "safe mode"
It only got worse ...
They took transmission fluid sample
No metal parts found... Im confused

 

With no metal in the fluid I would guess the clutch packs (gears) are still fine, it is just a tune issue or possible valve body issue.

 

Thank you
I will try on Monday

 

I would approach this in small steps. First, change the transmission fluid and be sure that the transmission filter and the transmission gasket are still in good condition (at this mileage, they should both be replaced). Once that is done, if the transmission continues to slip, then go to the next steps. Remember, transmission fluid cannot be drained like engine oil, it must be pumped out to get all of the fluid out of the transmission (fluid "exchange").

Do you notice any liquid under the car after you park it? If you do, put a small amount on your finger and smell it and look at the color (no I am not kidding). What does it smell like, does it have any odor at all?

Generally, transmission fluid should be changed around 30,000 miles. After that the fluid begins to breakdown. Does your transmission fluid have a "burnt" odor (burned transmission fluid has a distinct odor) can you determine the color? It should be a red color, if not, then it is time to change it.

Do not invest thousands of dollars into a transmission until you have exhausted your options.

Good Luck

 

Thank you
No leaks
Infiniti garage checked the fluid level it was OK
They say they never change transmission fluid... Sounds strange
I will start tomorrow from fluid change

 

How many miles do you have on the car?

 

Read the first post

 

keep us posted!

 

The trans fluid is good up to 100k miles change your fluid you should have smelled it to see if it smelt burnt