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Greg
Greg, Technician
Category: Car
Satisfied Customers: 7114
Experience:  Automotive diagnostic tech
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The engine management light is on and the car lacks power

Customer Question

The engine management light is on and the car lacks power for example on a motorway speed suddenly reduces from 70 miles an hours to 40mps.Stop the car ans restart and it is fine. Fuel system has been cleaned out but car is still doing it. It originally only occurred on motorways but is now doing it on a roads where I am travelling at slower speeds. Could this be a result of the glow plugs need replacing and/ or anything else. It is a 2008 Disel mercedes car. past MOT May and just had a main service.
Submitted: 1 month ago.
Category: Car
Customer: replied 1 month ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call.
Customer: replied 1 month ago.
Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  Greg replied 1 month ago.

Hi, I'm Greg (Indy-Tech).
Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
Rgds Greg.

Expert:  Greg replied 1 month ago.

Any warning lights come on wghen the engine is running .

Like the check engine light or is the glow plug light flashing .

Greg

Customer: replied 1 month ago.
The engine light is on, and the light like a metal coil comes on some times but surprisingly today is the first my engine management light has not come on. When it lacks power the ESP light triangle light comes on everytime. It first started doing it on the motorway and has started to do it on the minor roads
Expert:  Greg replied 1 month ago.

Okay this is the check engine and glow plug warning lights .

You need to get hooked up to a diagnostic scan tool and check for malfunction codes .

You could have a possible issue with the air flow meter or any of many engine sensors .

also possible and most likely a problem with the throttle control system , but to confirm you need to have a scan tool hooked up and check for malfunction codes ..

For further assistance with this issue please get back to me with the reply box below .
This is not a one answer and done i/we will stay with you until the problem is sorted out .
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Kind regards Greg..