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Mercedes-Benz engine repair questions and answers

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  • AutoMD Member
    AutoMD Member - 2000 Mercedes Benz ML320 - Engine - 1/29/2014
    Oil filter assembly threads damaged
    where the oil filter cap screws in to the engine, is that called the "oil cooler"? and can it be removed? threads damaged!!!
    • Jimm
      1/29/2014 Jimm
      Need more information - are you referring to the oil filler cap on the valve cover - on top of the engine? Or are you referring to the oil filter housing for the oil filter element that is replaced when changing the engine oil?
  • AutoMD Member
    AutoMD Member - 1989 Mercedes Benz 300E - Engine - 1/21/2014
    Transmission oil is getting into the radiator coolant
    have replaced the radiator as advised to is there another reason this is occuring
    • HouseCallAuto
      1/21/2014 HouseCallAuto
      I can't think of another way tranny oil would get into coolant except for the internal radiator cooler. I assume you are asking this question because the problem did not seem to resolve after replacing the radiator? Is it possible that it is engine oil and not tranny oil?
  • dennis
    dennis - 2002 Mercedes Benz CL500 - Engine - 1/17/2014
    How to replace a vehicle speed sensor
    • wbrockstar
      1/17/2014 wbrockstar
      Its usually mounted on the side of the transmission.It takes the place of or does the same job that a speedometer cable does.Its electrical though instead of being a cable that plugs into the transmission,,like a mechanical speedometer cable does
  • AutoMD Member
    AutoMD Member - 2009 Mercedes Benz C300 - Engine - 1/17/2014
    Hi, I have a 2009 Mercedes C300 (20K miles). All was working well until yesterday. I went to start the car and nothing
    I just hope it doesnt happen again.
    0 answer
  • AutoMD Member
    AutoMD Member - 2007 Mercedes Benz E320 - Engine - 1/17/2014
    The engine just cuts out sometimes. The Turbo also has a tendency to cut out.
    Sometimes the engine cuts out.
    • Jimm
      1/17/2014 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
  • AutoMD Member
    AutoMD Member - 1998 Mercedes Benz S500 - Engine - 1/12/2014
    Why car want idle when cold after star until you hold acelarateor @2500 rpm for about 25 min.
    after running @25 rpm its warm and start@every start until it set for awhile and gets cold then you have to hold accelator down start car and hold it down for about twenty min.or longer then it runs until it sits and gets cold
  • AutoMD Member
    AutoMD Member - 2004 Mercedes Benz ML350 - Engine - 1/8/2014
    Press gas pedal, hesitation before it accelerates.
    Made a hard stop at traffic light, then pressed accelerator and it didn't rev the engine nor did it move, then 2 -3 seconds it began to engage and move.
    • HouseCallAuto
      1/8/2014 HouseCallAuto
      Virtually everything that involves a running problem with the engine is diagnosed by observing the symptom first and then plugging in a code reader to see if any fault data codes are set in memory of the vehicle computer. These codes are needed to diagnose your cause and using a scan tool or code reader to get these codes cannot be skipped. if you want to proceed to try to fix this yourself you will need to invest a minimum of $20 for a code reader at for the purpose of reading your own fault codes (it takes a minute or two) and after you get the code numbers update this post with that information and then we at AutoMD can continue to assist.
  • MBny
    MBny - 2003 Mercedes Benz C230 - Engine - 1/8/2014
    Is there a battery available that I can use instead of the factory issued one?
    I took it to Sears to have it replaced and the mechanic told me their batteries don't fit. He suggested I go to the dealer but of course I wanted a second opinion. Thanks in advance.
  • Sheila
    Sheila - 1999 Mercedes Benz E320 - Engine - 1/5/2014
    Why is my check engine lights on sometimes
    sometime when I turn my car on the check engine lights pop up and a car start putting. I have slug in the engine I that can cause the problem?thank you
    • HouseCallAuto
      1/5/2014 HouseCallAuto
      It means that there is a malfunction with an engine sensor most likely and that a numeric fault code is stored in the computer memory. One has to access this data with a code reader and read the code. After knowing the fault code data a diagnosis might be made.
  • AutoMD Member
    AutoMD Member - 2005 Mercedes Benz E320 - Engine - 1/5/2014
    Auto key will not open car in frigid weather
    car not responding, will not unlock in frigid weather
    • Jimm
      1/5/2014 Jimm
      Replace the battery with a new one; 1) Take out the metal spare key from the electronic body
      2) At the top of the opening, you'll see a small plastic "latch"
      3) Use a small screw driver or pin to pust against this HORIZONTALLY (i.e., with key sensor facing down, push against this plastic piece horizontally)
      4) As you push, pull the top portion of the electronic key in the vertical direction. It should come out and allow you to replace the battery.
  • AutoMD Member
    AutoMD Member - 2005 Mercedes Benz E320 - Engine - 1/4/2014
    Auto key will not open car in frigid weather
    car 's electrical system seem out of wack in frigid weather - key will not unlock car.
    0 answer
  • angel laureano
    angel laureano - 2009 Mercedes Benz E350 - Engine - 1/4/2014
    Where is the batteries
    Replace baterie
    • Jimm
      1/4/2014 Jimm
      The 12 volt DC (VDC) battery for the vehicle is located under the hood next to the radiator.
  • roberto
    roberto - 1992 Mercedes Benz 300E - Engine - 1/3/2014
    My car has great difficulty starting only when the engine is cold
    once the engine is warm the problem goes away fuel filter has been replaced ignition has good spark
    • HouseCallAuto
      1/3/2014 HouseCallAuto
      Check the 10 amp fuse in the overvoltage protection relay. If it is blown, replace it and see if the symptoms are cured.
      2/22/2014 AutoMD Member
      I have the same problem except my car is 1988 hard to start until it warms up to about 40f then starts to idle on its own. the warmer it gets the better it runs. could this be the dame problem.

      2/23/2014 HouseCallAuto
      yes if it is a MB
  • outlaw
    outlaw - 2003 Mercedes Benz S600 - Engine - 1/3/2014
    Accelerator cable
    Little and slow acceleration
    • HouseCallAuto
      1/3/2014 HouseCallAuto
      Complex, requires diagnosis with MB equipment. there is no cable. This is a fly by wire system. Have to start with reading fault codes at very least. I would recc you find a MB tech unless you are a very seasoned and experienced DIY mechanic. You can obtain a basic code reader from Amazon for $17 but that will only read codes and not provide live data.
  • davidriewer
    davidriewer - 1988 Mercedes Benz 260E - Engine - 12/27/2013
    Wont start has spark and fuel
    has spark getting fuel but red light is on next to battery
    • AutoMD Member
      12/27/2013 AutoMD Member
      Is it getting too much fuel? Or is the spark not hot enough to fire the fuel, IE a bad coil or coils.
      What does the red light next to the battery signify!