Do automatic tranny cars roll back when its on an incline, like a manual would as you let out the clutch?

[BooGiMaN]

I was driving my sisters new camry and was on a semi steep incline and i swear as i let out the brake it rolled back before i pushed the accelerator, is this normal?

 

[Aharami]

i dont think so. from my experience, it always goes forward

 

[MacBaine]

It usually will roll back a few inches before stopping

 

[RagingBITCH]

Originally posted by: MacBaine
It usually will roll back a few inches before stopping

 

[Flyermax2k3]

My A/T DSM doesn't roll back at all at idle, only forward. At an incline I don't even need to use the brake for the car to sit still. Of course, on flat road it definitely needs the brake to prevent it from rolling forward

 

[Heisenberg]

Originally posted by: MacBaine
It usually will roll back a few inches before stopping

Mostly depends on how powerful the motor is and how steep the incline.

 

[ndee]

it depends how steep the hill is.

 

[radioouman]

um, yes.

 

[GasX]

Originally posted by: BooGiMaN
I was driving my sisters new camry and was on a semi steep incline and i swear as i let out the brake it rolled back before i pushed the accelerator, is this normal?

edit your thread title - ATs don't have clutches...

 

[xxAgentCowxx]

mine rolls backwards if the incline is steep enough

 

[BooGiMaN]

it was a pretty steep incline

 

[phreakah]

mine usually rolls back when i'm on an incline and release the brake.. sometimes it just stays still.. in either case, i press back on the brake

 

[95SS]

If the engine does not produce enough torque at idle, then yes, it will slowly roll down a hill backwards. It has do with the torque converter, since their isn't a direct mechanical connection from the engine all the way to the wheels.

 

[Harvey]

Cars with automatic trans can roll backward on a steep incline if the rearward gravitational pull exceeds the forward force of the drive train with the engine idling.

 

[teckmaster]

on a car with higher miles, usually when you start rolling backwards on a hill, it means that the transmission is starting to slip.


On another note, someone above said, A/T vehicles don't have a clutch. Um... Yes they do. It's not a clutch like a m/t has but there is a clutch in there. My car a couple months ago had a line break and it released the transmission from gear so that I didn't fry the tranny. Its a pressure clutch.

 

[azazyel]

In Seattle, YES it is normal. On some of our hills you need to apply the deceleratrix then switch quickly to the velocitator.

 

[GasX]

Originally posted by: teckmaster
on a car with higher miles, usually when you start rolling backwards on a hill, it means that the transmission is starting to slip.


On another note, someone above said, A/T vehicles don't have a clutch. Um... Yes they do. It's not a clutch like a m/t has but there is a clutch in there. My car a couple months ago had a line break and it released the transmission from gear so that I didn't fry the tranny. Its a pressure clutch.

fine - they have a clutch, but not one you can let out as is stated in the thread title...

 

[teckmaster]

I am aware of that but you said that he should change the title because automatics didn't have a clutch. I was just stating that they do in fact have clutches.


How A/T's work

 

[BooGiMaN]

Originally posted by: Mwilding

Originally posted by: teckmaster
on a car with higher miles, usually when you start rolling backwards on a hill, it means that the transmission is starting to slip.


On another note, someone above said, A/T vehicles don't have a clutch. Um... Yes they do. It's not a clutch like a m/t has but there is a clutch in there. My car a couple months ago had a line break and it released the transmission from gear so that I didn't fry the tranny. Its a pressure clutch.

fine - they have a clutch, but not one you can let out as is stated in the thread title...

sorry about the confusion on the title..i was referrign to letting out the clutch on the manual not the AT...i tried to edit it in a way that will make more sense.

 

[halik]

Originally posted by: 95SS
If the engine does not produce enough torque at idle, then yes, it will slowly roll down a hill backwards. It has do with the torque converter, since their isn't a direct mechanical connection from the engine all the way to the wheels.

ding ding ding...we have teh winnah

 

[halik]

Originally posted by: Mwilding

Originally posted by: teckmaster
on a car with higher miles, usually when you start rolling backwards on a hill, it means that the transmission is starting to slip.


On another note, someone above said, A/T vehicles don't have a clutch. Um... Yes they do. It's not a clutch like a m/t has but there is a clutch in there. My car a couple months ago had a line break and it released the transmission from gear so that I didn't fry the tranny. Its a pressure clutch.

fine - they have a clutch, but not one you can let out as is stated in the thread title...

they have planetaries... but those will have no affect on rolling backwards > when youre in idle on a steep incline, your car is in D and first gear. You dont use the planetary clutch at all at that moment, the first gear is engaged and it all depends on the idle torque and weight of your car.

 

[CraigRT]

some cars do, some cars don't.
it depends on a lot of things

vehicle weight
incline grade
idle speed of car
power of engine
headwind or tailwind

i mean, could be anything

 

[mjquilly]

Originally posted by: teckmaster
on a car with higher miles, usually when you start rolling backwards on a hill, it means that the transmission is starting to slip.

you sure about that?

 

[JDub02]

Originally posted by: mjquilly

Originally posted by: teckmaster
on a car with higher miles, usually when you start rolling backwards on a hill, it means that the transmission is starting to slip.

you sure about that?

That has nothing to do with it. As was stated earlier, it's about how much torque the engine makes at idle and the torque converter

 

[teckmaster]

another 50000 miles on my car, and it won't stay still on an incline. The life of the transmission plays a part in the process