Q: No power when accelerating

asked by on March 16, 2016

After replacing the mass air flow sensor and the EVAP, my car still doesn't have any power when I press the gas.The car does have surges of acceleration, but then it accelerates no further. I was told it might be the throttle position sensor.

Car is not getting enough power Inspection $94.99 - $114.99 Get a Quote

A faulty throttle position sensor can most certainly duplicate all of the symptoms that your Mercedes is experiencing, however a faulty fuel pump or even a defective mass airflow sensor can be the cause to these issues too. I have many times installed a brand new mass airflow sensor on a vehicle, only to have had them fail right out of the box in pieces. I recommend enlisting the assistance of a certified mechanic to come by and inspect your Mercedes with you before making any more repairs. They will have all of the tools and the experience necessary to identify exactly why your Mercedes is having a lack of power. They will also be able to perform the repairs necessary to restore power to your Mercedes so you can drive worry free.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

How do I use the luggage cover?
Your car may be equipped with a luggage cover (it’s optional equipment). If it is, then you have an important tool for protecting items in the back from exposure to heat, light and even prying eyes. Here’s how to use...
Brake pads making funny noise.
You may have more than one problem on your car. Your funny noise (https://www.yourmechanic.com/services/car-is-making-a-noise-inspection) may be the axle or bearing. the vibration on acceleration is in the axle or bearings. The vibrate when braking may be in the brake rotors....
Air conditioning makes whirring noise
Hi there. Depending on where the noise is occurring, this will help determine what is causing it. If the noise is coming from under the hood, then it is the compressor. It is common for the AC compressor shaft bearing...
Clutch stuck first reverse
It definitely sounds like a clutch hydraulic issue where fluid is leaking by a seal on the master or slave cylinder until the cylinder heats up and the seal is restored. The clutch slave cylinder housing is closest to the...
Idler pulley for surpentene belt fell off
Hello. If the bolt is gone then it either broke or loosened. If it simply fell out then the bracket is fine. I usually check the bracket hole to make sure that the threads are still there. If the threads...
Car problems
It will depend on why you had the engine rebuilt? If you had the engine rebuilt due to overheating and coolant came out of your exhaust then you may have damaged the catalyst during this period by sending hot coolant...
Rough idle, possible misfire, bad oxygen sensor a possible cause
There are a number of things that can cause a misfire to be present, but a failing oxygen sensor is certainly one of them. As you know the oxygen sensor (https://www.yourmechanic.com/services/oxygen-sensor-replacement) reads the exhaust gases and relays this information to...
1984 f350 6.9 not starting
Hi there. Based on your input, it's likely that the source of your issue are the relay's (as indeed they do "click" when activated) but it's also possible that your issue is caused by a different ignition system component. Assuming...
Why is it still misfiring?
Hi there. Check the Exhaust Gas Recirculation (https://www.yourmechanic.com/services/exhaust-gas-recirculation-egr-valve-replacement) valve on the engine. It seems to be sticking on when the engine is running at low idle and causing a misfire as the old exhaust that is burnt is reentering the...

Related articles

A Buyer’s Guide to the 2012 Mercedes Benz S-Class
If If you’re looking for a vehicle that delivers top-of-the-line features, comfort, performance and safety, all while showing off the prestige of the driver, the 2012 Mercedes Benz S-Class is your choice. Key Features With Active Body Control and a...
How to Source Parts For a Classic Mercedes-Benz
Classic Classic Mercedes-Benz cars are just as elegant and gorgeous as current model year Mercedes vehicles in many cases. There is a devout following dedicated to classic (https://www.yourmechanic.com/article/how-to-buy-restore-and-sell-a-vintage-car-by-jason-unrau) Mercedes vehicles who are passionate about the technology, styling, and responsive handling...
How to Diagnose a No-Spark or Loss of Power Condition on a Modern Car
Misfires caused by a loss of power condition on a car can be tricky to diagnose, but are necessary to fix to avoid further damage and costly repairs.