my new subaru 1st & 2nd gear

[grape]

06 impreza wagon, with manual tranny. when engaged in 1st and 2nd gears, if
you release the throttle, at aroune 1000rpm, the car will jerk bouncily. It
only happens in 1st and 2nd gear, not in 3rd or 4th.


btw, during cold start idling, you will hear a click sound, then the idling
RPM goes up a bit, then gradually fall back, then you heard another click,it
goes up a bit a gain.... but only in cold start.


BTW, I've stalled the car a lots of time from station to move, will it
affect the car? only bought it for 2 days.

 

[hippo]

06 impreza wagon, with manual tranny. when engaged in 1st and 2nd gears, if

you release the throttle, at aroune 1000rpm, the car will jerk bouncily.
It
only happens in 1st and 2nd gear, not in 3rd or 4th.

btw, during cold start idling, you will hear a click sound, then the
idling
RPM goes up a bit, then gradually fall back, then you heard another
click,it
goes up a bit a gain.... but only in cold start.

BTW, I've stalled the car a lots of time from station to move, will it
affect the car? only bought it for 2 days.

Could the click could be your a/c cutting in and out? If it's on, try
running with it off and see.

The jerking sounds like it's transmision related adn probably quite
predictable if you do that sort of thing - happens in some other cars too.
AWD probably exacerbates it because ther's an extra diff in the mix. Does
backing off more gently at those revs make any difference? At least when
it happens in 2nd, you can change down to 1st and have a few more revs!
Cheers

 

[Mike Lloyd]

You didn't mention it was a turbo model, but in case it were be aware that
at lower RPMs, especially under 3k before the turbo kicks in, the engine
power is very anemic and you will have to feather or slip the clutch a
little more than on other cars. This might prevent you from stalling. Try
keeping the revs up a bit more and report back.

That "jerk" might be, again, becuase you are dropping the clutch too quickly
and jerking the drive train. The clutch has springs in it to absorb some
shock, but that also allows it to jerk back and forth a bit.

Lastly that click at low RPM on cold days may simply be due to the valve
train not getting the lubrication it need right away. This is ok, if you
just let it idle for a short while to build up heat and allow the oil to
thin a bit.

Funny, in cars we are so used to starting and driving off -- on every
motorcycle I've ever owned (and most people do to) they let it idle and warm
up for a few minutes. This was a must not too lond ago with carbs and
chokes.

Mike

 

[Steve Jones]

Could the click could be your a/c cutting in and out? If it's on, try
running with it off and see.

The jerking sounds like it's transmision related adn probably quite
predictable if you do that sort of thing - happens in some other cars too.
AWD probably exacerbates it because ther's an extra diff in the mix. Does
backing off more gently at those revs make any difference? At least when
it happens in 2nd, you can change down to 1st and have a few more revs!
Cheers

My 02 Impreza does the same thing if I'm sloppy in letting off the gas
(i.e. too quickly). Some days it seems more susceptible (temp,
humidity?), but, as stated above, easing off helps prevent it. Perhaps
the clutch in the Impreza is just a bit more "grabby".

Steve

 

[Mike Lloyd]

good point -- it might settle out after a good break-in, too.

 

[Larry Van Wormer]

"06 impreza wagon, with manual tranny. when engaged in 1st and 2nd gears, if
you release the throttle, at aroune 1000rpm, the car will jerk bouncily. It
only happens in 1st and 2nd gear, not in 3rd or 4th.

btw, during cold start idling, you will hear a click sound, then the idling
RPM goes up a bit, then gradually fall back, then you heard another click,it
goes up a bit a gain.... but only in cold start.

BTW, I've stalled the car a lots of time from station to move, will it
affect the car? only bought it for 2 days."

Sounds to me like you are operating the engine at too low an rpm. This
engine isn't really comfortable operating at less than 1500 rpm, if
there is any load. Of course, in first gear, you can go a bit lower in
rpm. However, your comment about frequent stalling leads me to think you
are not operating in it's "comfortable" range. Maybe try a bit more rpm
pulling away?

The clutch in Impreza's is a bit abrupt, but some more practice should
eliminate any problems you are now having.

Larry Van Wormer

 

[Steve Jones]

That "jerk" might be, again, becuase you are dropping the clutch too quickly
and jerking the drive train. The clutch has springs in it to absorb some
shock, but that also allows it to jerk back and forth a bit.

If his is doing what mine does, it happens after you let off the gas
(the clutch is already out).

Steve

 

[Rick C]

If his is doing what mine does, it happens after you let off the gas

(the clutch is already out).

My 04 Impreza RS has been doing that for some time now. It started in
3rd gear only, then spread to 2nd, and now I think 1st and 4th are
starting to do it. The jerking motion is very annoying. I took my car
into the dealer once, and he told me it's normal, but I seriously doubt
that. It happens at any RPM, but it doesn't happen all the time.
Anyone know what it could be that's causing that? I'd like some more
info so I can take the car back to the dealer and specify what they
should test and fix.

-Richard

 

[Paul]

06 impreza wagon, with manual tranny. when engaged in 1st and 2nd gears, if
you release the throttle, at aroune 1000rpm, the car will jerk bouncily. It
only happens in 1st and 2nd gear, not in 3rd or 4th.


btw, during cold start idling, you will hear a click sound, then the idling
RPM goes up a bit, then gradually fall back, then you heard another click,it
goes up a bit a gain.... but only in cold start.


BTW, I've stalled the car a lots of time from station to move, will it
affect the car? only bought it for 2 days.

The tranny stuff is normal for subarus. My family has had subarus for
over 26 years and they all have had this. Just another subaru quirk.

pcj



--
Paul Johnson
Graduate Student - Mechanical Engineering
University of Florida - Gainesville, Fl
http://plaza.ufl.edu/redboots

Reclaim Your Inbox!
http://www.mozilla.org/products/thunderbird

 

[grape]

I don't know if you uner stand my question or I misunderstood your reply.
hehe

That is, when the car is moving in 1st &/or 2nd gear, if I let off the
throttle, the car slows down, and RPM drops as well, and as RPM drops around
1000, the car will started to jerk forward and backward, and this only
happens in 1st&2nd gears. 3rd and 4th won't show such an effect even if RPM
drops to 1000.

 

[grape]

it's 2.5i, and no, not let off clutch,.... it's just a normal driving in 1st
/2nd gear at around 20km/h, then you let off the throttle, watching the RPM
drops, until it's around1000RPM, the car starts to jerk forward and
backward.

and forgot to mention it, when engaged in reverse, if let off throttle too
quickly, the car does the same jerk...also around 1000RPM.
"Mike Lloyd" <[email protected].> wrote >

 

[MK IV]

I don't know if you uner stand my question or I misunderstood your
reply. hehe

That is, when the car is moving in 1st &/or 2nd gear, if I let off the
throttle, the car slows down, and RPM drops as well, and as RPM drops
around 1000, the car will started to jerk forward and backward, and
this only happens in 1st&2nd gears. 3rd and 4th won't show such an
effect even if RPM drops to 1000.

Step on the clutch dude! You're not driving an automatic... At 1000 rpm
your car is stalling. If in 2nd gear, pass it into neutral, blip the
throttle and shift it into 1st gear; and if in 1st gear at 1000 rpm,
either stop the car or step on the throttle and get going!

 

[Edward Hayes]

When you let off the gas the fuel system shuts down UNTILL you get to
about 1000 rpm and the fuel system starts again so the engine get fuel
to idle. What you are experiencing is the fuel systems computer
cycling the on & off. This is a common phenomena of fuel inject
vehicles.

 

[grape]

had some expert driven my car, and he said that there's no problem, only coz
I let the RPM dropped so low. He recommand me to shift down.

still curious, why in my old automatic camry le v6, I can let the RPM drop
so low that without any jerking? my old camry can have 500RPM without any
jitting.


btw, amazingly, he can pull-off in 2nd gear without stalling the car.

 

[Bredehoft]

If his is doing what mine does, it happens after you let off
the gas
(the clutch is already out).

Steve

My 05 Legacy Ltd maintaines RPM when the throttle and clutch are
released for a two-count. If you shift during that two-count it jerks.
I was told 1) it’s a polution control thing and 2) it goes away with
age. The car has 4,000 miles on it and it still wants to jerk. I’ve
gotten very good at being patient and shifting with a two-count.

 

[Bredehoft]

it's 2.5i, and no, not let off clutch,.... it's just a normal
driving in 1st
/2nd gear at around 20km/h, then you let off the throttle,
watching the RPM
drops, until it's around1000RPM, the car starts to jerk
forward and
backward.

and forgot to mention it, when engaged in reverse, if let off
throttle too
quickly, the car does the same jerk...also around 1000RPM.
"Mike Lloyd" <[email protected].> wrote >

I did misunderstand you, mine only jerks when I let the clutch out too
fast.

No help here on your problem. Sorry.

 

[Bredehoft]

had some expert driven my car, and he said that there's no
problem, only coz
I let the RPM dropped so low. He recommand me to shift down.

still curious, why in my old automatic camry le v6, I can let
the RPM drop
so low that without any jerking? my old camry can have 500RPM
without any
jitting.


btw, amazingly, he can pull-off in 2nd gear without stalling
the car.

Sure, your Camry with the automatic can do it. One of the major
differences between an automatic and a manual transmission is that
the manual has a positive connection to the rear wheels and the
automatic has a slip connection. If you slow a manual down far enough
with the clutch engaged it will even stop running (after jumping
around to remind you to engage the clutch.)

 

[hippo]

My 05 Legacy Ltd maintaines RPM when the throttle and clutch are
released for a two-count. If you shift during that two-count it jerks.
I was told 1) it’s a polution control thing and 2) it goes away with
age. The car has 4,000 miles on it and it still wants to jerk. I’ve
gotten very good at being patient and shifting with a two-count.

Sounds fair enough. Heaps of current engines (and even more earlier air
pump equipped ones) maintain revs for a while before going to idle, so
it's easy to butcher a change if you just clutch, shift, then lift off;
because as the revs finally fall to an idle, the engine realises it's
still lugging the drivetrain round with it too and it snatches. I say use
the clutch more sympathetically and put the poor thing out of its misery!
Cheers

 

[hippo]

had some expert driven my car, and he said that there's no problem, only
coz
I let the RPM dropped so low. He recommand me to shift down.

still curious, why in my old automatic camry le v6, I can let the RPM drop

so low that without any jerking? my old camry can have 500RPM without any

jitting.

Just to try and simply compare the two but not give a totally technically
accurate picture:

Manual - two plates physically joined together by pressure unless you push
in the clutch. Resistance leads to snatching and jerking.

Automatic - two plates not physically joined but in a common bath of
fluid. Resistance leads to internal slipping and so cushions snatch.

There's more to it than that but the bottom line is that manuals will tend
to snatch near stall point and autos won't. Cheers

 

[Mike Lloyd]

plus that v6 has more torque down low I am almost positive -- not to mention
more inertial spinning mass.