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Mercedes-Benz engine repair questions and answers

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  • 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, www.partsgeek.com, www.rockauto.com, www.discountautoparts.com, www.autopartswarehouse.com, www.jcwhitney.com, www.pelicanparts.com - 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
  • 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 ...
     
    0 answer
  • cynthia allen
    cynthia allen - 1996 Mercedes Benz S320 - Engine - 5/8/2014
    While driving the oil stick pops up and spits oil on engine, but i replaced oil stick and rthats not the problem.
    only when i drive does the stick pop up, and the engine is idling high, while car is in park, no check engine light on. ive paid over 2000 for repairs and nothing has changed.
     
    • GT500Knights
      5/8/2014 GT500Knights
      Replace your pcv valve, clean any filters associated with it. Your pcv (positive crankcase ventilation) valve is plugged and is restricting combustion blowby vapors from having a way to escape--so they find the easiest way out. In your case, it's the oil dipstick tube. Pressures build up to a point and push the dipstick tube out, along with a nice surprise of engine oil. Repair this problem first to see if it fixes your high idle issue. If it doesn't, search for any vacuum leaks that may be allowing excess unmetered air into the engine, and check ignition timing to make sure it isn't too far advanced.
      GT500Knights
      5/8/2014 cynthia allen
      ty so much
      GT500Knights
      5/8/2014 cynthia allen
      do ypu have an idea where the pcv valve is located so that i may make sure the mechanic is being honest .
    • GT500Knights
      5/8/2014 GT500Knights
      The pcv valve is typically located on the top or side of one of the valve covers. It will have a length of rubber vacuum hose going from it to somewhere after the maf sensor of the intake, usually to the throttle body or intake manifold. It's very likely that the hose is brittle and will break when pcv valve replacement is done. Some oil tends to get into the rubber hose. That, combine with heat and time, will cause the rubber to turn brittle and crack, creating a vacuum leak if it is not taken care of.
  • JIm Mathews
    JIm Mathews - 1988 Mercedes Benz 420SEL - Engine - 5/7/2014
    Purchased this car with retrofitted R134 AC. Brought to local Shop. They put 2 pounds 134 in and cannot get AC cold
    Car does not get even slightly Cold. I was told maybe mono valve, etc. Blower motor works fine. Just no Cold AC at all!! They want to put in a new compressor, drier, etc!!
     
    • GT500Knights
      5/7/2014 GT500Knights
      Did they also include the necessary oil into the system? Without the oil, the compressor will fail. There are many things that can go wrong with the ac system, and it is very prone to leaks. Even the smallest leaks can cause the refrigerant to leak from the system within a weeks time, preventing the system from turning on (safety feature for compressor if refrigerant level is too low)

      Also I just looked up your car on alldata, 2 lbs is too much refrigerant. It's actually supposed to be about 1 lb 12 oz.
  • AutoMD Member
    AutoMD Member - 1994 Mercedes Benz C280 - Engine - 4/21/2014
    Why does the heat come on when I turn on the ac. and some time s when there's nothing on..
    The heat comes on when I turn on the ac, and sometimes when nothing is turned on..
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2000 Mercedes Benz E430 - Engine - 4/15/2014
    Car starts right up, drives very good, then after about 10-15 minutes of driving the car shuts down while driving
    it will not restart for about 30 minutes.
     
    • Pepe
      4/15/2014 Pepe
      Sounds like the crankshaft position sensor or engine coolant temperature sensor... Check the PCM for any codes, that should point you to the right direction.
  • AutoMD Member
    AutoMD Member - 1998 Mercedes Benz S320 - Engine - 4/7/2014
    Leaking reservoir who to approach initially
    how does one start off,from under or what? can it be repaired or replaced?
     
    • Jimm
      4/6/2014 Jimm
      First question - is this referring to the coolant system reservoir? If yes, the reservoir tank is easily replaced - utilize these on-line resources and guides; www.pelicanparts.com/techarticles/MBZ_Tech_Index-W203.htm

      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, www.partstrain.com - to list only a few possibilities.
      In fact, they (RockAuto) list the coolant reservoir (coolant recovery / expansion) tank from around $39.70 for your vehicle. Use the Uro part # 1405001749 - or equivalent.

      Here are the details and replacement steps involved;

      Over time, the coolant expansion tank tends to turn yellow with age, become brittle forming micro fractures and sometimes leak. When the car warms up, both the heat and pressure of the coolant starts to attack the weakest point of the tank, eventually causing it to fail and the car starts leaking coolant. The good news is that the replacement tank is relatively inexpensive and can be changed in less than an hour.

      Take a look around the coolant tank. In some instances, you can instantly see it has been leaking. In others, you may only see a faint trace of coolant weeping/staining the crack or seam. It's important to tackle this problem as soon as possible. Warning: Failure to repair or replace a leaking cooling system component can potentially cause a catastrophic failure damaging the engine.

      A couple of safety precautions / instructions you may want to observe before beginning:

      1) Allow cooling system to cool down to a coolant temperature of less than 90°C.

      2) Open cap of cooling system slowly; turn a conventional coolant cap as far as the first detent and turn a screwed coolant cap approx. 1/2 turn and release the pressure.

      3) Wear protective gloves, protective clothing and eye protection.

      4) NEVER pour coolant into beverage bottles, cups, etc... Someone might accidentally pick that cup up and start to drink.

      5) If you are going to be replacing the tank you might as well replace the coolant as well, as there may be the chance contaminants got into the tank and fluid. If it is an emergency and you need to get the car right back on the road it is possible to remove the coolant from the tank with a turkey baster and just replace the tank and lost coolant, but I recommend doing it right and draining the coolant. Even with the coolant drained you should expect a little spillage when removing the hoses, so be prepared for it.

      Step1) Begin by safely jacking up and supporting your car. With the car safely off the ground you will need to remove the engine tray. There are six 8mm bolts holding the tray on, the rear two also help hold the transmission tray. If you are going to leave the transmission tray on, remove the rear two bolts first, lower the engine tray, reattach the transmission tray bolts, then remove the remaining four bolts on the engine tray.

      Step 2) With the tray removed you will see radiator drain plug on the lower left front of the car. Place a catch bucket or tray under the plug and use a large flat head screw driver to open the drain plug. The fluid will come out slowly at first so open the tank cap to break the vacuum and help speed things up. The fluid drains out a small spigot facing rearward and not through the red plug.

      Step 3) From the top of the tank you will need to remove the 10mm nut on the upper right side. The tank sits in a plastic slot in the firewall that helps support it.

      Step 4) Remove the right side air intake to give you more room to work on the hoses. It compresses in towards the engine then slips off.

      Step 5) With the air intake removed you can now pull the auxiliary water pump from its mount on the tank (it just pulls straight out) , remove the coolant level sensor plug along with the wires for the pump and sensor from the bracket on the front of the tank. Next, you want to remove the hose connected to the bottom of the tank. If the hose is original it will have a compression clamp on it, simply squeeze it together and you may have to use a small screw driver to help break the seal between the hose and tank. Be prepared to catch the small amount of coolant that will spill out.

      Step 6) Pull the tank straight up, it may take a little force as there is a small rubber grommet it sits in on the bottom.

      Step 7) Take the old tank to your bench and if you where not having problems with the level sensor remove the old one by turning it 45 degrees and install it in the new tank.

      Installation is the reverse of removal
      Jimm
      4/7/2014 AutoMD Member
      great commentary unfortunately it was the windshield wiper reservoir is leaking and I have had estimates of 260$just to start and removing the front fender!!
    • Jimm
      4/7/2014 Jimm
      Did you access the website (www.pelicanparts.com) referenced previously - they offer many MB specific repairs and detailed steps; including the wiper washer reservoir replacement steps.

      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, www.partstrain.com, www.fcpeuro.com - to list only a few possibilities.
      In fact, they (FPCEuro) list the washer reservoir container from around $82.90 (genuine Mercedes part # 1408600260)