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Mercedes-Benz engine repair questions and answers

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  • Jerry
    Jerry - 1989 Mercedes Benz 560SL - Engine - 8/22/2014
    The idiot light left of the ABS indicator light comes on why? It is not marked.
    This light come on for a few seconds and then goes off. It does that all the time. Any ideas?
     
    0 answer
  • dreamstomorrow
    dreamstomorrow - 2000 Mercedes Benz S500 - Engine - 8/18/2014
    Key wont turn in ignition do I need a new key or a new ignition?
    used the car 15 minutes prior to this occurring went to put smart key in ignition and wont turn. battery isn't dead and don't know whether or not this means I just need a new key or whether or not the whole ignition/modulator might need to be replaced... now I don't ...
     
    • AutoMD Member
      8/18/2014 AutoMD Member
      if there two problem: 1. the eis is borken, for this, you need to go your local workshop to repair it
      2. there is problem of keys, you can reprogram a new key
  • AutoMD Member
    AutoMD Member - 2002 Mercedes Benz C240 - Engine - 8/9/2014
    How many miles will a mercedes get if car is maintained?
    I'm considering buying 2002 c class with 100,000 miles. I understand these cars can maintain over 180,000 mikes on them if engine is maintained. Is that close to correct? Bill
     
    • Jimm
      8/9/2014 Jimm
      Actual mileage and service life will vary - in addition the actual service life realized is also dependent upon the specific maintenance performed / completed on the vehicle since day one.

      Generally, if you have been provided all the service history / maintenance records for the first 100k miles and follow the recommended maintenance schedule you will maximize the life of the vehicle. Recognize there are no such guarantees.
  • AutoMD Member
    AutoMD Member - 2002 Mercedes Benz C240 - Engine - 8/7/2014
    Engine life, if well maitained
    Do these cars actually last for over 180,000 miles if engine is maintained?
     
    • CVO
      8/7/2014 CVO
      It's a Mercedes Benz, it built to last.
  • AutoMD Member
    AutoMD Member - 1998 Mercedes Benz E430 - Engine - 8/3/2014
    Car running hot have put new radiator
    the car was gave to me and it had been parked for a while but when i start it up it runs hot
     
    • CVO
      8/3/2014 CVO
      A low coolant level, a coolant leak (through internal or external leaks), poor heat conductivity inside the engine because of accumulated deposits in the water jackets, a defective thermostat that doesn't open, poor airflow through the radiator, a slipping fan clutch, an inoperative electric cooling fan, a collapsed lower radiator hose, an eroded or loose water pump impeller, or even a defective radiator cap.
  • AutoMD Member
    AutoMD Member - 1997 Mercedes Benz S500 - Engine - 8/2/2014
    Do I need to reprogram new ignition switch
    Old switch has short replaced it with exact part. All lights come on dash and turns over. Put old one back in jiggle it and can get it to start but that's why I replaced it because of short. New one fits snug and everything works but no start.
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2004 Mercedes Benz CLK320 - Engine - 8/2/2014
    Air Conditioner would shut down after 10 minutes and no air
    the other day I went to use it and after 10 minutes or so a strong order and smoke was coming through the Vents. I shut down the A/C and was able to continue the trip. Could it be the heater core or the A/C. Thank you, htmiller1940@yahoo.com
     
    • CVO
      8/2/2014 CVO
      A broken heater core is the cause of this problem.
  • AutoMD Member
    AutoMD Member - 1981 Mercedes Benz 380SL - Engine - 7/29/2014
    Like to know where is the EGR valve located??
    any leak on the valva can cause the motor lose the power??
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1990 Mercedes Benz 500SL - Engine - 7/26/2014
    How do you adjust the belt tension
    After replacing the serpentine belt it appears loose even though the tensioner has plenty of resistance and travel
     
    • Jimm
      7/26/2014 Jimm
      First, double check that the correct length and part number serpentine drive belt is installed; should be - Gates part # K060994, Dayco part # 5060990 - or equivalent.

      Next, unless the belt tensioner is new or has been recently replaced - it is a good idea to replace the belt tensioner at the same time as the serpentine drive belt.

      The parts are readily available from these many on-line sources, www.partsgeek.com, www.rockauto.com, www.discountautoparts.com, www.autopartswarehouse.com, www.jcwhitney.com - to list only a few possibilities.
      In fact, they (RockAuto) list the serpentine drive belt from around $9.60, and the belt tensioner from around $56.70 for your vehicle.
  • AutoMD Member
    AutoMD Member - 1990 Mercedes Benz 500SL - Engine - 7/26/2014
    How do you adjust the belt tension
    After replacing the serpentine belt it appears loose even though the tensioner has plenty of resistance and travel
     
    • Jimm
      7/26/2014 Jimm
      First, double check that the correct length and part number serpentine drive belt is installed; should be - Gates part # K060994, Dayco part # 5060990 - or equivalent.

      Next, unless the belt tensioner is new or has been recently replaced - it is a good idea to replace the belt tensioner at the same time as the serpentine drive belt.

      The parts are readily available from these many on-line sources, www.partsgeek.com, www.rockauto.com, www.discountautoparts.com, www.autopartswarehouse.com, www.jcwhitney.com - to list only a few possibilities.
      In fact, they (RockAuto) list the serpentine drive belt from around $9.60, and the belt tensioner from around $56.70 for your vehicle.
  • AutoMD Member
    AutoMD Member - 2003 Mercedes Benz C240 - Engine - 7/24/2014
    Car will not restart after I shut it down
    was driving along fine when I felt the car lose power and go slow even though I was stepping on gas pedal, pulled over and shut car off to restart and maybe reset whatever was wrong. Car turns over but will not start, couple of times it seemed to start only to ...
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1981 Mercedes Benz 380SL - Engine - 7/21/2014
    The motor lose the power when I drive at high speed
    My car works normally in the city at low speed, but when I drive on the highway at high speed 60 to 75 MPH after a while, the car starts lose the power I push the gas pedal but the car not responds then the motor turn off, after some minutes the motor start again ...
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1981 Mercedes Benz 380SL - Engine - 7/21/2014
    The motor lose the power when a run at high speed
    My car works normally in the city at low speed, but when I drive on the highway at high speed 60 to 75 MPH after a while, the car starts lose the power I push the gas pedal but the car not responds then the motor turn off, after some minutes the motor start again ...
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1989 Mercedes Benz 420SEL - Engine - 7/21/2014
    Identifying correct cruise control amplifier.
    Replaced amplifier in 2010. From APW, part number WO1331601333, which has 14 + 8 male pins. New amp ordered has only 14 pins w/WO1331602420. I think chassis # is 126.035 eng # 116.965. Amp OEM # may be 0055450532-88.
     
    0 answer
  • SunnyMoe
    SunnyMoe - 2002 Mercedes Benz S430 - Engine - 7/19/2014
    My car hesitates to accelerate when gas pedal is being pushed
    If I'm at a red light that turns green my car doesn't immediately take off the gas pedal has to be pushed hard
     
    • Jimm
      7/19/2014 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