FAQs—Mercedes Benz CLS55 AMG
I have a Mercedes Benz CLS55 AMG. When I turned the ignition, my car revved up at first and then died. I tried to turn it again but now it's not starting. How do I find the problem?
The most likely cause of this is that your Mercedes Benz CLS55 AMG has run out of gas. This should be the first thing you should look at when you have problems starting your car. If you can read the gas gauge without having to start your vehicle, then look at it to confirm how much fuel is left. But if you can't do that, add some gas to the tank then try starting your car again. If it starts and runs, then it's all good—you just have to add more fuel to your vehicle.
My Mercedes Benz CLS55 AMG usually performs well, but when I floor the gas pedal the motor doesn't respond and the car doesn't accelerate. Is there a possible fix for this issue?
If your Mercedes Benz CLS55 AMG's engine hesitates or lacks power, then your car might be sucking too much air, not getting enough fuel, or is misfiring. In case the Check Engine light comes one, scan for error codes in so you can pinpoint the problem. But if this doesn't happen, then your car might have a bad throttle position sensor (TPS). This component is responsible for telling the computer how far the throttle is open, which the computer uses to determine how much fuel is needed to maintain the correct air/fuel mixture. If the TPS is faulty, then it's not sending the correct information to your car's computer, resulting in your vehicle not getting enough fuel to operate properly. Another possible cause would be dirty fuel injectors. If dirt and deposits have built up in the tips of the injectors, they will not spray as much fuel as they usually do, creating a lean fuel mixture that will lead to acceleration stumble and hesitation. You will have to get either of these components cleaned, repaired, or replaced in order to solve the problem.
This doesn't happen every time, but my Mercedes Benz CLS55 AMG turns over but doesn't start. What could be causing this?
An intermittent problem like this is difficult because the problem doesn't manifest all the time, so instead you have to wait for the issue to occur again before you do anything else. But when it does happen, there's a test you can do to find the root cause. Have a friend sit in the driver's seat, and you go to the gas filler cap. Remove the cap then listen to the open gas filler pipe while your friend turns the ignition switch. You should hear a whirring sound from the gas tank for a few seconds. That is the sound of the electric fuel pump running. If you don't hear anything, then this component is bad, the relay powering it has failed, or the computer that runs the relay has malfunctioned.