Car won’t move after a sudden hard stop

Rusty · 12-20-2019, 08:44 PM

Sounds like the tranny fluid is draining out of the valve body over a period of time. Then takes a while for the valve body to refill.

SchumiF399 · 12-20-2019, 09:40 PM

Quote:

Originally Posted by Rusty

Sounds like the tranny fluid is draining out of the valve body over a period of time. Then takes a while for the valve body to refill.

Thanks Rusty, will more fluid fix this then?

Rusty · 12-20-2019, 10:02 PM

Quote:

Originally Posted by SchumiF399

Thanks Rusty, will more fluid fix this then?

Sometimes yes. Sometimes no.

Spooler · 12-20-2019, 10:14 PM

Quote:

Originally Posted by SchumiF399

Ok so I am at a loss now. I feel I should have never messed with this a this point. The car is doing the same thing now but only when cold. After I got it from the shop yesterday it sat in the garage for about 4 hours and then my Dad and I went for a drive. No issues then. I got in the car just now after it had been off for about 24hrs and it did it. Once it got up to temp it did not do it. What should I do?

It is still a little low. When the tranny fluid is cold it will contract. When it warms up it expands. You are still just a touch low.

SchumiF399 · 12-20-2019, 11:25 PM

Quote:

Originally Posted by Spooler

It is still a little low. When the tranny fluid is cold it will contract. When it warms up it expands. You are still just a touch low.

The shop will look at the car again tomorrow. Hopefully 3rd time is the charm. I’ll update you guys. Thanks again everyone.

Quote:

Originally Posted by SteveSAS

Were there any issues with the car before transmission fluid was replaced?

No not at all. I only did it to try and prolong the life of my transmission as I didn’t think the fluid was “immune” to degrading.

SteveSAS · 12-20-2019, 10:36 PM

Were there any issues with the car before transmission fluid was replaced?

SteveSAS · 12-23-2019, 02:52 AM

Maybe just add another litre and see what happens.
But I heard that overfilling auto transmissions can cause issues as well.

JARblue · 12-23-2019, 08:00 AM

You should only add cold fluid to a cold transmission. Then you have to start the car and idle it for a few minutes to bring the fluid up to temp. The transmission fluid should be 104F in order to verify the proper fill level. Note that you may have to back flush the AT cooler to remove any debris that might have built-up.

SchumiF399 · 12-26-2019, 02:40 PM

Just a quick update guys, the shop saw the car Saturday and let the car cool for about 30 min. They then proceeded to filling it some more and I can confirm the issue is no longer there after I tested it cold. Thank you all.

12-20-2019, 08:44 PM	#1 (permalink)
Rusty A True Z Fanatic Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 70 Posts: 35,571 Drives: 2011 Nismo GM 6M Rep Power: 2684440	Sounds like the tranny fluid is draining out of the valve body over a period of time. Then takes a while for the valve body to refill. SchumiF399 likes this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

12-23-2019, 08:00 AM	#8 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 45 Posts: 36,450 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684442	You should only add cold fluid to a cold transmission. Then you have to start the car and idle it for a few minutes to bring the fluid up to temp. The transmission fluid should be 104F in order to verify the proper fill level. Note that you may have to back flush the AT cooler to remove any debris that might have built-up. __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \| Last edited by JARblue; 12-23-2019 at 08:03 AM.

12-26-2019, 02:40 PM	#9 (permalink)
SchumiF399 Base Member Join Date: Apr 2018 Location: California Posts: 38 Drives: 2012 370z Rep Power: 9	Just a quick update guys, the shop saw the car Saturday and let the car cool for about 30 min. They then proceeded to filling it some more and I can confirm the issue is no longer there after I tested it cold. Thank you all. Rusty, Spooler, old guy and 2 others like this.

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12-20-2019, 10:36 PM	#6 (permalink)
SteveSAS Base Member Join Date: Jun 2018 Location: Australia Posts: 61 Drives: 370z Rep Power: 5365	Were there any issues with the car before transmission fluid was replaced?

12-23-2019, 02:52 AM	#7 (permalink)
SteveSAS Base Member Join Date: Jun 2018 Location: Australia Posts: 61 Drives: 370z Rep Power: 5365	Maybe just add another litre and see what happens. But I heard that overfilling auto transmissions can cause issues as well.