‘17 S63A4 Cabriolet - Rough Startup when cold
Thread Starter
Newbie
Joined: Feb 2014
Posts: 7
Likes: 3
From: Wesley Chapel, FL
'22 e450 Cabriolet
‘17 S63A4 Cabriolet - Rough Startup when cold
I’ve owned the vehicle for over a year (it was one of the last 2017s on the lot) ..
If the vehicle sits overnight, the startup is rough (idles up, then down, then Normal (about 800 RPM). Sometimes the vehicle will stall during idle-down. It has been this way (off and on) since delivery.
After nearly a month at the dealership, they can’t reproduce the problem. MB corporate involved, but they are siding with dealer (can’t fix what they can’t reproduce). I don’t seem to have a problem .. send the dealer videos, but that doesn’t seem to be sufficient.
Thoughts ???
If the vehicle sits overnight, the startup is rough (idles up, then down, then Normal (about 800 RPM). Sometimes the vehicle will stall during idle-down. It has been this way (off and on) since delivery.
After nearly a month at the dealership, they can’t reproduce the problem. MB corporate involved, but they are siding with dealer (can’t fix what they can’t reproduce). I don’t seem to have a problem .. send the dealer videos, but that doesn’t seem to be sufficient.
Thoughts ???
MBWorld Fanatic!
Joined: Jul 2014
Posts: 1,270
Likes: 160
From: UNKNOWN
NB8 PARACHUTE
`
Is the car outside at night or in a garage -
Do the same warm-up symptoms occur
during the warm summer nights of July and
August and the much colder nights of December
and January -
Has MB replaced the fuel delivery system -
What octane % are you running -
Does this happen every morning -
Some Vegas summer mornings are
80 degrees at 8am -
If you can provide more information
that would be very helpful -
Thank-You
D.B.
.
Is the car outside at night or in a garage -
Do the same warm-up symptoms occur
during the warm summer nights of July and
August and the much colder nights of December
and January -
Has MB replaced the fuel delivery system -
What octane % are you running -
Does this happen every morning -
Some Vegas summer mornings are
80 degrees at 8am -
If you can provide more information
that would be very helpful -
Thank-You
D.B.
.
Last edited by COOPERDB; Sep 11, 2019 at 12:07 AM.
Thread Starter
Newbie
Joined: Feb 2014
Posts: 7
Likes: 3
From: Wesley Chapel, FL
'22 e450 Cabriolet
Car is garaged at night and under a carport during the day (office).
Do the same warm-up symptoms occur during the warm summer nights of July and August and the much colder nights of December and January:
Yes
Has MB replaced the fuel delivery system:
No. However:
Local dealership has completed a compression test and a scope (per a recent work order) to check for compression issues, or leaky injectors
What octane % are you running:
91
Does this happen every morning - Some Vegas summer mornings are 80 degrees at 8am:
The problem seems to be sporadic. Can't consistently reproduce the issue, but when I can it seems to stick around for a while. For example when I picked up vehicle, it was doing just fine.
Thanks for responding & the discussion ...
Do the same warm-up symptoms occur during the warm summer nights of July and August and the much colder nights of December and January:
Yes
Has MB replaced the fuel delivery system:
No. However:
Local dealership has completed a compression test and a scope (per a recent work order) to check for compression issues, or leaky injectors
What octane % are you running:
91
Does this happen every morning - Some Vegas summer mornings are 80 degrees at 8am:
The problem seems to be sporadic. Can't consistently reproduce the issue, but when I can it seems to stick around for a while. For example when I picked up vehicle, it was doing just fine.
Thanks for responding & the discussion ...
MBWorld Fanatic!
Joined: Jul 2014
Posts: 1,270
Likes: 160
From: UNKNOWN
NB8 PARACHUTE
`
I am going with some aspect of the fuel delivery system
being the problem with the warm-up situation -
I think that there is a problem somewhere in the
fuel delivery system -
By the time the dealership's service people are ready
to do whatever testing they claim they are doing the
car has already warmed up -
Something in the fuel delivery system is impeding the
flow of fuel during warm-up but once warmed up the fuel flows fine -
Thank-You
D.B.
.
I am going with some aspect of the fuel delivery system
being the problem with the warm-up situation -
I think that there is a problem somewhere in the
fuel delivery system -
By the time the dealership's service people are ready
to do whatever testing they claim they are doing the
car has already warmed up -
Something in the fuel delivery system is impeding the
flow of fuel during warm-up but once warmed up the fuel flows fine -
Thank-You
D.B.
.
Joined: Mar 2018
Posts: 1,410
Likes: 233
From: Socal and Norcal
MY17 S63AMG - MBUSA Buyback. MY16 SL63 - Sold MY19 W213 E63s. 2020 W213 E63s Wagon
Being a 2017, does this car have any time been tuned ? Spark plugs been charged?
Last edited by S63AMG888; Oct 10, 2019 at 06:22 PM.
