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Mercedes-Benz engine repair questions and answers

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1716 Questions
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  • SunnyMoe
    SunnyMoe - 2002 Mercedes Benz S430 - Engine - 7/8/2014
    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
    0 answer
  • Gene
    Gene - 2003 Mercedes Benz E320 - Engine - 7/6/2014
    What to do when engine quits
    It was running smoothly then I accidentally choke it manually then it's sputtering to stop
    0 answer
  • AutoMD Member
    AutoMD Member - 1993 Mercedes Benz 190E - Engine - 6/17/2014
    Engine turn over, but the car will not start. I am getting a very weak spark yellow/ orange color not blue.
    This happen before and i replaced the coil. the engine started up immediately. this time the coil is checking out good
    0 answer
  • AutoMD Member
    AutoMD Member - 2006 Mercedes Benz C230 - Engine - 6/13/2014
    Autostick funcitionality stopped working
    I was at the light and put the car in 1st to take off the car started off slowly, and I noticed the funcitionality stopped working? What happend to this system? What should I do? Thanks
    0 answer
  • AutoMD Member
    AutoMD Member - 1988 Mercedes Benz 420SEL - Engine - 6/9/2014
    Brought Mercedes to PEB BOYS for AC Charge. When they atrted the Car Timing chain broke?? What can be done in
    Brought Car in to charge AC. They tried to start Car and called me at Home to say Timing Chain Broke?? Any answers , thoughts or Legal rights I may have??
    0 answer
  • AutoMD Member
    AutoMD Member - 2008 Mercedes Benz GL450 - Engine - 6/9/2014
    Why does the car experience hard start when engine temperature is hot, or weather is hot?
    The car will start in the mornings with a slight hesitation, but as the day goes warmer, and the engine gets hotter the hesitation is prolonged and in some instances will require turning off and turning on again.
  • AutoMD Member
    AutoMD Member - 1989 Mercedes Benz 300CE - Engine - 6/8/2014
    Hard to start when car is cold
    When trying to start vehicle in the mornings, after sitting for several hours, the vehicle will turn over like it is trying to start but takes many times to get it started. Once it is started, and it is warm, it will run fine for the day. Check engine light is not ...
    • AutoMD Member
      6/8/2014 AutoMD Member
      Have the battery tested at autozone for free it is more than likely that .. possible the starter or battery cables ..
  • MrCaracicatriz
    MrCaracicatriz - 2001 Mercedes Benz S500 - Engine - 5/29/2014
    Why does my car hesitate/stall when I first press the gas after backing out of my driveway in the morning?
    It's almost a jerking motion unless I press the gas pedal very slowly and carefully. Only does this in the morning after being parked all night.
    0 answer
  • AutoMD Member
    AutoMD Member - 2000 Mercedes Benz E430 - Engine - 5/23/2014
    My MB E430 died while driving, engine cranks but won't start.
    This is a 2000 MB E430 which has over 200K miles. I have replaced the Crankshaft positioning sensor, added 10 gallons of fuel and when I turn the key, before cranking the engine, I can hear the "Hum" that I assume is the fuel pump working. The fuel filter has ...
  • AutoMD Member
    AutoMD Member - 1995 Mercedes Benz C220 - Engine - 5/22/2014
    I fill the container with antifreez and 30 later its emty
    Any time driving or parked the over heating light is on
    • GT500Knights
      5/22/2014 GT500Knights
      You have a large coolant leak somewhere. After running the car and parking it check underneath for any dripping coolant. Follow the trail of coolant to where it is coming from in the engine. Most common locations for leaking to occur is from radiator, water pump, heater core, cracked hoses, and thermostat housing.

      If the leak is not dripping externally, it may be an internal leak, such as the head gasket. If the head gasket goes, then the cylinders can suck in the coolant and 1) burn it off as steam 2) end up in hydrolock.
    • Jimm
      5/22/2014 Jimm
      Have these two (2) inexpensive tests performed - before guessing and spending more money: cylinder compression test and cooling system pressure test - with the engine cold.
  • AutoMD Member
    AutoMD Member - 2001 Mercedes Benz E320 - Engine - 5/21/2014
    Car hesitates to fire up after sitting for 10-15 mins
    Car hesitates to fire up or crank when its been sitting for about 10-15 mins. OLike a trip to the grocery store. Will crank but it drags as if its struggling to go ahead and fire up.
    0 answer
  • Dennis
    Dennis - 1999 Mercedes Benz E430 - Engine - 5/19/2014
    What steps are required to get the starter out of the small space under my E430 Mercedes
    I know I must jack the engine up about an inch after loosening the right engine mount but what else has to be undone to facilitate the raising of the engine?
    • Jimm
      5/19/2014 Jimm
      The WIS worksheets show an instruction for loosening (not removing) the passenger side engine mount and raising the engine 20 mm prior to the starter removal.
  • AutoMD Member
    AutoMD Member - 1990 Mercedes Benz 300E - Engine - 5/16/2014
    Cooling system leaks in front from crack in plastic housing, can this piece be replaced or do I need an entire radiator
    car overheats after idling while parked and antifreeze is coming out of plastic housing which is o the front left side of radiator
    • Jimm
      5/16/2014 Jimm
      If the radiator is cracked - it is usually less expense to simply replace the radiator than to have it repaired.

      The parts are readily available from these many on-line sources,,,,,, - to list only a few possibilities.
      In fact, they (RockAuto) list the replacement radiator from around $88.00 for your vehicle. Be sure to also replace the radiator hoses and the radiator hose clamps at the same time - cheap insurance.
  • AutoMD Member
    AutoMD Member - 1993 Mercedes Benz 400E - Engine - 5/12/2014
    Mercedes 400 E 94 is missing really bad we got a time up then start missing really bad again what else could it be ?
    The Catalytic converter isn't getting red so it doesn't look clogged the fire is ok we just got a full tune up not too long ago except the wires. We got new disrupter caps full tune up spark plugs ect... Then it start acting funny missing bad so we ...
    • alex
      5/12/2014 alex
      first i would double check your spark plug wires to make sure they are on in the right order. the reason the miss is worst in gear is because their is a load on the engine so it the engine slows down more when a cylinder doesn't fire. what i would do is with it running pull off one wire at a time and see which plugs are missing if it's 2 try swapping the two of them with each other. if it is unchanged but they were sparking. ohm check the injectors for what ever cylinders are not firing check them against ones that are firing should be simalar ohms.
  • AutoMD Member
    AutoMD Member - 1993 Mercedes Benz 400E - Engine - 5/11/2014
    Mercedes 400 E 94 is missing really bad we got a time up then start missing really bad again what else could it be ?
    The Catalytic converter isn't getting red so it doesn't look clogged the fire is ok we just got a full tune up not too long ago except the wires. We got new disrupter caps full tune up spark plugs ect... Then it start acting funny missing bad so we ...
    • GT500Knights
      5/11/2014 GT500Knights
      Have a look at the egr valve. I would pull it off and inspect it, clean it and the passages out with a pipe cleaner brush. It's possible that a piece of carbon debris has gotten lodged between the pintle and where it seats when it's closed, causing it to stay in the open position and allow too much inert exhaust in through the intake.

      Did you double check your wiring? Make sure you have the spark plug wires going to the correct locations. Sounds like you may be down two cylinders, in which case you would swap the wires that are routed incorrectly.

      It is possible that you have a bad dose of gasoline that may be tainted with water. Use seafoam to stabilize the fuel.

      Check for proper fuel pressure, and that your injectors are not clogged. Replace the fuel filter if it was not originally part of the tune up procedure.

      One other thing you might check is your mechanical timing. Here's how you would do this:

      1. Remove negative cable from battery
      2. Remove cap from distributor, but leave the rotor on
      3. Get a socket fit the proper size for the crankshaft bolt.
      4. Using a large ratchet or breaker bar, rotate the crankshaft and carefully observe how the rotor on the distributor reacts. The distributor is usually connected via a helical gear to the camshaft, and the camshaft is connected to the crankshaft via a chain or belt. When you rotate the crankshaft , rotate it both directions. Clockwise, then when you see the rotor on the distributor move, rotate the fan shaft the other direction. If you see that the rotor delays it's movement in relation to your rotating the crankshaft, you may have worn/stretched timing belt or chain.

      I would also perform a compression test to verify that all cylinders are operating within close compression of each other