Merc C-Class Auto - Rolls backwards

#11

DervMan wrote:

Quote:

"Monkeys" <monkeys (AT) monkeysonthemoon (DOT) net> wrote in message
news:brq0g0$10p$1 (AT) titan (DOT) btinternet.com...
Hi,

Tested a late 2001 C-Class C270CDi Auto. Driving felt fine, but had
to keep my foot on the brake on inclines to stop it rolling
backwards (in drive, obviously). Is this normal? Older Merc didn't
do this. On the flat it would creep slowly forwards as expected.

Also it's had two Merc dealer services, but most recent (3rd, so
major) service by the dealer selling it (unauthorised). The dealer
tells me this will not invalidate the Merc warranty as they used
Merc parts - is this correct?

Tried ringing Merc for advice but fell asleep on hold.

I'd suppose that the transmission slips itself into neutral when
stationary for more than a few seconds to save fuel . . . how steep a
gradient?

The auto-box on my Rover 75 diesel goes into neutral when stationary but
only when the foot-brake is on - so the car wouldn't roll back under such
circumstances anyway!

Kev

#12

Dave Plowman wrote:

Quote:

In article <bruj42$7mqgq$1 (AT) ID-74687 (DOT) news.uni-berlin.de>,
Mungo \two sheds\ Toadfoot <skank (AT) skanksville (DOT) freeserve.co.uk
wrote:
I would imagine that it's not supposed to do that. Just my opinion
but I'd have thought that MB would have done something to stop that
happening.

The normal 'creep' on a basic box should stop roll back on all but
steep hills. Wonder if the Merc selects neutral after idling for some
time, and this isn't working as it should?

See above Dave - my Rover 75 auto box goes into neutral when stationary but
only if the foot-brake is applied. My driveway at home is fairly steep and
the normal 'creep' of my auto-box will not hold the car - it begins to go
backward if I don't apply foot or hand brake. This also happened with my two
previous autos - a Cavalier and an Omega.

Kev

#13

In article <brusiq$7bm$1 (AT) newsg3 (DOT) svr.pol.co.uk>,
Uno Hoo! <kevlunn (AT) spambustlunn11 (DOT) freeserve.co.uk> wrote:

Quote:

The normal 'creep' on a basic box should stop roll back on all but
steep hills. Wonder if the Merc selects neutral after idling for some
time, and this isn't working as it should?

See above Dave - my Rover 75 auto box goes into neutral when stationary
but only if the foot-brake is applied.

Think I'd find that rather annoying. Perhaps after it had been stopped in
that condition for a while, though. Do you have to re-select drive to move
off, or is this automatic?

Quote:

My driveway at home is fairly steep and the normal 'creep' of my
auto-box will not hold the car - it begins to go backward if I don't
apply foot or hand brake. This also happened with my two previous autos
- a Cavalier and an Omega.

I'm sure it happens on a steep hill - physics says it must - but I've not
experienced it on the likes of a multi-story car park ramp.

--
*I'm really easy to get along with once people learn to worship me

Dave Plowman dave.sound (AT) argonet (DOT) co.uk London SW 12
RIP Acorn

#14

Sounds bloody dangerous. I'm on my umpteenth auto motor and they all have
held on all but the steepest of hills. Took my latest to the Pyrenees two
years ago and forgot to turn the traction control off that made thing a
little sloppy on some gradients in traffic. But other than that had no
problems. have to say I have never had a Merc. Bm's, Volvos, Mazdas, Fords
even Vauxhalls all held well on the auto box when required. I cancelled the
C-Class I once ordered in favour of the BM 5er best move I ever made.

"Monkeys" <monkeys (AT) monkeysonthemoon (DOT) net> wrote

Quote:

Hi,

Tested a late 2001 C-Class C270CDi Auto. Driving felt fine, but had to
keep
my foot on the brake on inclines to stop it rolling backwards (in drive,
obviously). Is this normal? Older Merc didn't do this. On the flat it
would creep slowly forwards as expected.

Also it's had two Merc dealer services, but most recent (3rd, so major)
service by the dealer selling it (unauthorised). The dealer tells me this
will not invalidate the Merc warranty as they used Merc parts - is this
correct?

Tried ringing Merc for advice but fell asleep on hold.

Cheers,

#15

Dave Plowman wrote:

Quote:

In article <brusiq$7bm$1 (AT) newsg3 (DOT) svr.pol.co.uk>,
Uno Hoo! <kevlunn (AT) spambustlunn11 (DOT) freeserve.co.uk> wrote:
The normal 'creep' on a basic box should stop roll back on all but
steep hills. Wonder if the Merc selects neutral after idling for
some time, and this isn't working as it should?

See above Dave - my Rover 75 auto box goes into neutral when
stationary but only if the foot-brake is applied.

Think I'd find that rather annoying. Perhaps after it had been
stopped in that condition for a while, though. Do you have to
re-select drive to move off, or is this automatic?

Selector remains in 'Drive' of course - and that mode is re-selected as soon
as foot is removed from brake. In practice you don't even notice it. The
main aim seems to be fuel economy - the engine doesn't have the 'drag' of
the auto box while you're waiting at lights etc.

Quote:

My driveway at home is fairly steep and the normal 'creep' of my
auto-box will not hold the car - it begins to go backward if I don't
apply foot or hand brake. This also happened with my two previous
autos - a Cavalier and an Omega.

I'm sure it happens on a steep hill - physics says it must - but I've
not experienced it on the likes of a multi-story car park ramp.

On moderate slopes my car still creeps forward uphill - it just depends upon
the degree of slope! It can either be 'in balance (in which case the car
remains stationary without application of brakes) or it's out of balance in
which case it either creeps forward or begins to roll back - just depends on
the degree of slope.

Kev

Kev

#16

In article <brv9nb$cf4$1 (AT) news7 (DOT) svr.pol.co.uk>,
Uno Hoo! <kevlunn (AT) spambustlunn11 (DOT) freeserve.co.uk> wrote:

Quote:

Selector remains in 'Drive' of course - and that mode is re-selected as
soon as foot is removed from brake. In practice you don't even notice
it. The main aim seems to be fuel economy - the engine doesn't have the
'drag' of the auto box while you're waiting at lights etc.

Right. I certainly know when I engage drive from neutral on my ZF - it's
not rough, but noticeable. It's also not instantaneous.

--
*A conscience is what hurts when all your other parts feel so good *

Dave Plowman dave.sound (AT) argonet (DOT) co.uk London SW 12
RIP Acorn

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Merc C-Class Auto - Rolls backwards

Miscellaneous UK car topics Other UK car topics (uk.rec.cars.misc)

Re: Merc C-Class Auto - Rolls backwards - 12-19-2003 , 06:54 AM

Re: Merc C-Class Auto - Rolls backwards - 12-19-2003 , 06:57 AM

Re: Merc C-Class Auto - Rolls backwards - 12-19-2003 , 07:17 AM

Re: Merc C-Class Auto - Rolls backwards - 12-19-2003 , 08:11 AM

Re: Merc C-Class Auto - Rolls backwards - 12-19-2003 , 10:41 AM

Re: Merc C-Class Auto - Rolls backwards - 12-19-2003 , 12:53 PM