Q: Nothing happens when I push the gas pedal

asked by on January 29, 2017

My car will not stay on. When I push the gas pedal, sometimes the rpms go up, sometimes they don't. My car ends up shutting off. I received error codes: P0300, P0302, P0104, P0171, and P0174.

I changed the spark plugs, and mass air flow sensor. Car has 3/4 of a full tank of gas. I always use premium. When the engine is running, it runs rough.

My car has 56000 miles.

The P0104 is probably the key. This is a code for the Mass Air Flow circuit. What it means is that the reading from the MAF is not along the lines of what the ECU expects. The 171 and 174 are telling you that the engine is running too lean, so the MAF signal is showing less air moving into the engine than it requires. The 300 and 302 codes are misfire codes, and are probably related to the lean condition. The first thing to check for is any air leak; vacuum lines and air hose connections, (some are under the intake manifold). I see you’ve replaced the MAF, but there could also be a problem in the electrical connector or the circuit itself that is affecting the signal. Diagnosing this problem can get pretty complicated. If you would rather delegate this work, you can contact Your Mechanic to have a technician come out to your home or office and check out your Mercedes and let you know what can be done about it.

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

What others are asking

Engine whines, knocks, and has slow acceleration

Hey there. I would suggest you have a mechanic come and listen to the noise and verify the noise you hear. The engine may be making normal noises. You may be hearing the idle control and air pump noises that...

Lights flickering on car.

Flickering lightbulbs are usually caused by a loose connection try wiggling the connector of the problem bulb to see if thats the problem, a partially broken wire would also cause this symptom. Have a mechanic come an inspect and repair...

My car cranks but won't start sometimes

This may be caused by a number of things such as leaking fuel injectors or potentially a faulty ignition coil(s). Coils are coated with a varnish-like insulation that becomes brittle over time after being stretched then contracted repeated as the...

Check Engine light on

The powertrain control module (PCM) takes inputs from dozens of sensors. It then uses this information to control outputs such as fuel delivery and emissions equipment. If the PCM detects a problem anywhere in the system it will illuminate the...

Hesitation over 45 mph

Improper air metering or fueling can hinder engine performance. A clogged fuel filter can offer enough fuel for an engine to start, but lack in enough volume for higher loads. Have an experienced technician look over the vehicle fueling and...

Fuse continually blows when A/C is turned on

Hello there. This is a common issue with the Suzuki Vitara. There are a few different faults that could cause the fuse to blow repeatedly and the AC not to function. When a fuse repeatedly blows, this is typically an...

My car starts, stalls, and then speeds up fast, what could be the problem ?

The first thing to check for is air leaks. Look under the hood for any large or small rubber hoses that are in bad condition and could be allowing air leakage. Any air that gets into the engine without going...

Check ingine light is on and car died while I was driving

Claimed by Jeff Engstrom

Coolant is leaking behind the motor against firewall, on the passenger side, but only when the engine gets hot, Ford explorer 2002

Hi Logan. Thanks for contacting us today. The leak is likely coming from either a coolant line or more likely, the heater core. To ensure you have the right repairs completed, you should have a professional mechanic complete an onsite...

Related articles

A Buyer’s Guide to the 2012 Mercedes Benz S400 Hybrid
When When you expect your vehicle to show everyone that you have truly arrived, while being greener than some of the other luxury options, the 2012 Mercedes Benz S400 Hybrid needs to be on your list. Add in the fact...
Industry News for Automotive Techs: October 22-28
Japanese automakers step up security, Mercedes' X-Class pickup, carsharing with Turo, VW TDI settlement approved, Faraday Future behind on payments.
5 Essential Things to Know About Luxury Vehicles
There’s There’s something to be said about the looks and offerings of luxury vehicles, but appearances can always be deceiving. If you’re considering buying a luxury car, there are a few things you need to know before you make your...