w124 cutting out under acceleration

ncundy

New Member
Joined
Mar 13, 2011
Messages
10
Car
W124 E320
My 320E has a rather disturbing trick of cutting out under full acceleration. It only happens under full (pedal to the metal) acceleration, and always at about 70 mph. Just cuts out. It will start again instantly once I've coasted to a stop, with no seeming ill effects.

Under partial and near full on acceleration it doesn't happen, if I go full acceleration then back off, it doesn't happen. I thought it may be fuel starvation, but I've gone through the fuel system looking for leaks (nothing), it has a new filter, fuel consumption is steady (28mpg on long run).

Any ideas??

Thanks in advance
Neil
 

kth286

MB Enthusiast
Joined
Feb 4, 2003
Messages
2,923
Location
Caversham Berks
Car
E320 Coupe
do you know an indie familiar with that age Merc ?

if so it would be useful to check the diagnostic fault codes, as a first step.

where you located, perhaps someone can recomend one.
 

grober

MB Master
Joined
Jun 22, 2003
Messages
30,684
Location
Perth, Scotland
Car
W204 ESTATE
Are you depressing the kickdown switch under the accelerator pedal? Could be a fault /short in its circuitry.
 
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ncundy

New Member
Joined
Mar 13, 2011
Messages
10
Car
W124 E320
Thanks for the replies;

I'm in Derby, no w124 people around here that I'm aware of?

Yes, I'm using the kickdown - works fine (i.e it always kicksdown, it's only when I keep my foot right to the floor for 2-3 seconds that it cuts out, as described above) .

Fuel pump may be an idea - I had a search through the forum but couldn't find anything similar.

Hmmmm...
 

grober

MB Master
Joined
Jun 22, 2003
Messages
30,684
Location
Perth, Scotland
Car
W204 ESTATE
The other thing that happens at full throttle is that the full load throttle switch is activated to enrich the mixture. There can also be a preset engine speed limiting device which suppresses the fuel injection pulses ---don't know if this applies to your car or not. My guess would be a problem with either the electronic throttle --sender or actuator, or with the throttle plate assembly or throttle valve limit switches. :dk:
 

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