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Mercedes-Benz engine repair questions and answers

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  • Dr. Aisien Osaretin
    Dr. Aisien Osaretin - 1999 Mercedes Benz S320 - Engine - 12/19/2014
    Why does it vibrates and sometimes go off when i try to accelerate or move the car
    290000kms. happens offen when hot and when i am driving. it occur all the time. first noticed 3 weeks ago.check engine light not on. no other warning light observed.
     
  • Dr. Aisien Osaretin
    Dr. Aisien Osaretin - 1999 Mercedes Benz S320 - Engine - 12/19/2014
    Why does it vibrates and sometimes go off when i try to accelerate or move the car
    290000kms. happens offen when hot and when i am driving. it occur all the time. first noticed 3 weeks ago.check engine light not on. no other warning light observed.
     
    0 answer
  • John
    John - 1987 Mercedes Benz 300E - Engine - 12/8/2014
    What is wrong when the engine shuts down while driving.
    mileage - 309521 no work performed while driving down the road engine shuts off. after waiting for approx 3 min it will start back up, but will shut down after driving approx 1.5 miles. happens when it is warm. it has happen twice in 6 months the radiator light ...
     
    0 answer
  • coby
    coby - 2005 Mercedes Benz C240 - Engine - 12/6/2014
    Where is the fuse/relay that powers the fuel pump?
    the engine is not getting fuel
     
    0 answer
  • Mkhan
    Mkhan - 1989 Mercedes Benz 560SEC - Engine - 12/3/2014
    Car Idle goes up and down on start up
    I have a 560sec with millege of 160 000 km on the clock. The problem happens when I start engine, it starts up fine, then the engine idle hunts up and down ( Also noticed that economy gauge is where the red starts) When engine is warmed up problem seems to be gone ...
     
    0 answer
  • isaiahwalker74
    isaiahwalker74 - 1997 Mercedes Benz E320 - Engine - 12/1/2014
    Will E320 "97" still crank if battery is dead?
    I have a 12v battery charger hooked up and still wont crank.... car has been sitting for months w/out a start
     
    • CVO
      12/1/2014 CVO
      A 3/4 charge battery is 12.50 volts
      A discharge battery is 11.75 volts.
      A battery under a cranking load and it is reading less than 7 volts,it will be a recycled battery.

      Local auto parts stores will recharge, test your battery and the vehicle charging system with their mobile analyzer for free of charge.Give them a call.
  • Sleeping beauty
    Sleeping beauty - 2003 Mercedes Benz ML350 - Engine - 11/30/2014
    What could be causing fumes inside the cabin of my car ??
    I am trying to figure out what could be causing fumes inside of my car. This is the second car it has been happening with and I am positive my car has been tampered with.I was getting extreme headaches & Nauseous, and falling asleep. after being assured by police ...
     
    0 answer
  • isaiahwalker74
    isaiahwalker74 - 1997 Mercedes Benz E320 - Engine - 11/30/2014
    Will car still crank if battery is fully dead?
    I have a 12v battery charger hooked up and still no crank.... car has been sitting for months w/out being started, is this just a dead battery or a big problem?
     
    0 answer
  • isaiahwalker74
    isaiahwalker74 - 1997 Mercedes Benz E320 - Engine - 11/30/2014
    Will E320 "97" still crank if battery is dead?
    I have a 12v battery charger hooked up and still wont crank.... car has been sitting for months w/out a start
     
    0 answer
  • isaiahwalker74
    isaiahwalker74 - 1997 Mercedes Benz E320 - Engine - 11/30/2014
    Will E320 "97" still crank if battery is dead?
    I have a 12v battery charger hooked up and still wont crank.... car has been sitting for months w/out a start
     
    0 answer
  • isaiahwalker74
    isaiahwalker74 - 1997 Mercedes Benz E320 - Engine - 11/30/2014
    Will E320 "97" still crank if battery is dead?
    I have a 12v battery charger hooked up and still wont crank.... car has been sitting for months w/out a start
     
    0 answer
  • Richard
    Richard - 2002 Mercedes Benz C240 - Engine - 11/17/2014
    Fault code cylinder 6 misfire
    have changed injector and swapped coil tested fuel pressure and read supply voltage to injector and coil good
     
    • Jimm
      11/17/2014 Jimm
      P0306 = Cylinder number 6 misfire detected
      A code P0306 may mean that one or more of the following has happened:
      •Faulty spark plugs or wires (particular to number 6 cylinder)
      •Faulty coil (pack)
      •Faulty oxygen sensor(s)
      •Faulty fuel injector(s)
      •Burned exhaust valve
      •Faulty catalytic converter(s)
      •Stuck/blocked EGR valve / passages
      •Faulty camshaft position sensor
      •Defective computer

      If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

      If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

      Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0306 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.
  • Robert Fulks
    Robert Fulks - 2012 Mercedes Benz E350 - Engine - 11/1/2014
    How do I remove the plastic engine topper so I can access the spark plugs?
    All videos I've seen on the subject indicate that the plastic top on the engine is simply snapped on. Not So!. My car has the piece integrated with the air intake (mass flow sensor and several electrical component) and is bolted to the car. I've found the two bolts ...
     
    0 answer
  • Shelley
    Shelley - 1988 Mercedes Benz 420SEL - Engine - 10/20/2014
    I installed an injection system on my car before i installed an injection system it was running ok u just smelled gas
    the gas smell was coming from the injection system because gas was coming out the gasket on the injection system now my car wont idle and i have a bad battery will that stop my car from idling ? can u help me?
     
    0 answer
  • SunnyMoe
    SunnyMoe - 2002 Mercedes Benz S430 - Engine - 10/18/2014
    My car hesitates when I try to accelerate what could be the problem ??
    If I'm at a red light that changes to green when trying to go it doesn't go
     
    • benz guy 888
      10/18/2014 benz guy 888
      define hesitates? does if feel like its choking or loss of power? i suggest the following: if you have an automatic transmission check the level of the atf, you may need to add some atf...next, check your air filter. an old air filter will have problems letting air pass through. you'll have to replace this if it is dirty...next, check your fuel tank, lines, fuel filter. if there are sediments in the tank, lines, etc..you'll have to get this cleaned. the fuel filter should be replaced. if there is any air in the lines or in the filter, there might be a crack in the o-rings or fuel lines...replace them...hope this helps.
    • Jimm
      10/18/2014 Jimm
      First step - have the stored fault codes or check engine light scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA. Then, post a reply as 'add answer' with the specific code for more assistance. There may be a fault code stored in the OBD memory which may not be displayed as a check engine light.

      Possible Causes of Engine Hesitation or Stumble:

      Dirty fuel injectors (cleaning the injectors often fixes this)
      Dirty air filter (change filter)
      Dirty / clogged fuel filter (change filter)
      Bad MAP (manifold absolute pressure) sensor
      Bad TPS (throttle position) sensor
      Bad or dirty MAF (mass airflow) sensor
      Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
      Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
      Bad gasoline (fuel contaminated with water or too much alcohol)

      Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

      Dirty or worn spark plugs
      Bad plug wires
      Weak ignition coil
      Wet plug wires