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-   -   7AT question/possible issue help (http://www.the370z.com/engine-drivetrain/104819-7at-question-possible-issue-help.html)

GZ3 06-17-2015 11:04 AM

*** UPDATE***7AT question/possible issue help
 
Recently on some spirited runs Ive noticed my cars transmission doing something odd. Basically just crusing going about 65-70, go WOT,usually the car just drops gear and takes off. But this time it seemed to almost double rev(?) while it hit 3rd and took off. Like you would hear/see the engine and revs shoot up and then grab the gear and go. I hope that makes sense...but you can hear the engine go "ruumm' *once...then "ruumm" twice and on the second rev is when it took off... anyone heard of this before? has happened a few times already thanks

SouthArk370Z 06-17-2015 11:35 AM

Sounds like low fluid level to me. Possibly a weak pump. Edit: That's going by my experience with much older auto trannys. Could be a lot of other things with a TCM-controlled transmission.

With the proper OBD/CAN software, you can monitor/log transmission parameters to get a better idea of what's going on.

kenchan 06-17-2015 01:09 PM

please elaborate more on the "ruumm" sound.

vtec to vvel 06-17-2015 01:18 PM

most likely downshifted twice to a lower gear (ie downshift once to a lower gear (first rumm), and then downshifted once again to another lower gear (second rumm). its possible depending on the speed/gear your car was in at time of WOT.

FPenvy 06-17-2015 01:21 PM

was this in manual or auto mode?

if you downshift at the moment the tranny is auto downshifting you'll get a double downshift.

GZ3 06-17-2015 02:19 PM

Quote:

Originally Posted by FPenvy (Post 3231493)
was this in manual or auto mode?

if you downshift at the moment the tranny is auto downshifting you'll get a double downshift.

It was in normal D, just floor it and it does one rev to match rev then it kinda revs again and this catches gear and takes off

From 60 mph it can only drop to 3rd gear though is what worries me

GZ3 06-17-2015 02:20 PM

Quote:

Originally Posted by kenchan (Post 3231475)
please elaborate more on the "ruumm" sound.

It was ruuuummmm!! Then RUUUUUUUUUUUMMMM! Lol

FPenvy 06-17-2015 02:31 PM

Quote:

Originally Posted by GZ3 (Post 3231569)
It was in normal D, just floor it and it does one rev to match rev then it kinda revs again and this catches gear and takes off

From 60 mph it can only drop to 3rd gear though is what worries me

what do you mean it can only drop to 3rd at 60mph and that worries you?

sounds about where you'd want to be for a drop the WOT run at those speeds even 4th as well.

critical 06-17-2015 02:36 PM

how do you know what gear you're in? you're in D.

it's probably just downshifting, then realizing it needs to go to a lower gear. doesn't really sound like a problem

vtec to vvel 06-17-2015 02:47 PM

Quote:

Originally Posted by GZ3 (Post 3231572)
It was ruuuummmm!! Then RUUUUUUUUUUUMMMM! Lol

thats vtec yo!

please post audio of you doing this :tup:

GZ3 06-17-2015 02:50 PM

Quote:

Originally Posted by FPenvy (Post 3231580)
what do you mean it can only drop to 3rd at 60mph and that worries you?

sounds about where you'd want to be for a drop the WOT run at those speeds even 4th as well.

Thats what i mean, between 60mph and about 75mph the transmission shouldnt be shuffling around for gears. 3rd is the only option at WOT. It feels like the car blips the throttle then grabs gear and goes... Instead of dropping gears and going all at once like normal. Im gonna do the fluid flush here ina few mins

GZ3 06-17-2015 02:52 PM

Quote:

Originally Posted by critical (Post 3231586)
how do you know what gear you're in? you're in D.

it's probably just downshifting, then realizing it needs to go to a lower gear. doesn't really sound like a problem

If you ever want to know what gear your car puts you i. At wot whild in D, just tap it over to manual mode and youll see it in the tach

GZ3 06-17-2015 02:52 PM

Quote:

Originally Posted by vtec to vvel (Post 3231606)
thats vtec yo!

please post audio of you doing this :tup:

Vtec??!!! Lmao... I want my VVEL back hahah

6spd 06-17-2015 02:55 PM

Some one say rum?

http://img2.wikia.nocookie.net/__cb2...micCon_Rum.PNG

FPenvy 06-17-2015 02:56 PM

Quote:

Originally Posted by GZ3 (Post 3231615)
Thats what i mean, between 60mph and about 75mph the transmission shouldnt be shuffling around for gears. 3rd is the only option at WOT. It feels like the car blips the throttle then grabs gear and goes... Instead of dropping gears and going all at once like normal. Im gonna do the fluid flush here ina few mins

how many miles are on the car?

how often do you drive in manual mode?


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