Losing Power

[mrspirite]

hi abers,can anyone help please..a friend of mine has a small Mercedes car,and she says it keeps losing power..no warnings no warning lights.
on motorway it lost power and dropped down to 30 mph without warning.not a good thing..any ideas please.thanx in advance.

[dustypuss]

Try giving it a good dose of redx it might help

[TWR]

First bit of advise, do not go onto the Motorway, there seems to be a Fuel / ECU Problem here, I would get the system checked, but keep off the Motorway unless she wants to end up in a box.

[ToraToraTora]

probably a diesel going into limp mode.

[tonyav]

Limp mode would put the engine managment light on.

[mrspirite]

it'spetrol,and also if she stops and restarts the engine,its fine again.

[FrogNog]

I agree with TWR. Stay off the motorway.
A lorry behind you can't stop if you lose power without warning.
I would take it to a mechanic before shoving additives in the engine and I wouldn't drive it until it was fixed.
It's a pretty dangerous fault.

[tonyav]

Has TWR say's, it does sound like some sort of ECU fault. By turning of the ignition and restarting the engine it is resetting it ( temporarily ).

[tonyav]

I'm surprised that the engine management light is not coming on though.

[DTCwordfan]

Agree with tony, the ecu is training itself from start-up - the car will be okay and then suddenly do this.... Merc garage soonest me thinks.

[Hopkirk]

I would take it straight to a garage.