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Mercedes-Benz engine repair questions and answers

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    JOE BELMONT - 1986 Mercedes Benz 560SEL - Engine - 11/22/2010
    When I put the vehicle into park, it idles very high.
    The vehicle has 186,250 miles. When I stop and shift into park, the rpm just excel. Idles very fast. No check lights are on. However, it does seem to run hot. I installed a new water pump and flushed out the radiator and condensor.
      11/22/2010 MOONSTER_TOOLZ
      There are various reasons why the engine idles high such as; wrong engine timing; it controls the combustion process and if the timing is too far advanced the engine will idle too fast. To check for this condition use a "timing light" and follow the timing setting procedure for your car. A defective PCV valve; if this valve malfunctions such as the pressure spring breaking or carbon holding the valve open it will cause the engine to "hunt" of idle or a steady high idle condition. A vacuum leak; if vacuum is allowed to leak it can cause a high idle condition. Check for broken or dilapidated vacuum hoses on and around the engine. Sensors fault; if a sensor is malfunctioning intermittently it might not send proper inputs and by this reason false data convinces the ECM to raise the engine idle. Check the engine with a scan tool to retrieve stored trouble codes. By this, you're able to narrow down the possibilities.
  • terrypfleiger
    terrypfleiger - 1981 Mercedes Benz 380SLC - Engine - 11/22/2010
    Car cranks over but will not fire. no spark at dist cap. problem?
  • calvin
    calvin - 2003 Mercedes Benz SLK230 - Engine - 11/19/2010
    Need to know the spark plug gap setting
    • vince^_^
      11/19/2010 vince^_^
      The spark plug gap should be 0.031 in.
  • driver
    • vince^_^
      11/19/2010 vince^_^
      Your engine hesitate, the common (not limited) possible causes of it are dirty/clogged air filter, damaged/fouled spark plugs/plug wires, clogged/dirty fuel filter and clogged catalytic converter. If possible diagnose your vehicle with a scan tool to verify if all your electrical controls/sensor/circuits are functioning well.
  • dave
    dave - 1980 Mercedes Benz 280SE - Engine - 11/18/2010
    1970 280c elegance emissions are very high but runs fine
      11/18/2010 MOONSTER_TOOLZ
      Have it check by a scan tool. If engine performance is good and only the emission has a problem, it could be your sensor(s) (oxygen & MAP) is failing to provide proper inputs to the ECM that why you're engine is burning rich mixture.
  • txmarshall
    txmarshall - 1988 Mercedes Benz 300SEL - Engine - 11/18/2010
    F.P. REG. vacuum line connection port???
    I pulled my fuel pressure regulator to see if was clogged causing the engine to die rite after wasn't the prob.when I got it loose i noticed the vacuum line wasn't connected anywhere.As Iwas looking for it's port location i noticed the idle control valve ...
    0 answer
  • txmarshall
    • Marcus Fenix
      11/17/2010 Marcus Fenix
      FIrst you have to lock your flywheel from turning i believe there is a tool for that but i just drive a screw driver on where the tooth of the starter mates with the flywheel and drive the thing down, or if im feeling lazy, i just choke the belt that connects to the water pump.

      I believe there are four bolts you have to remove on the outer part BUT you need a allen wrench for the allen bolt
      Marcus Fenix
      11/17/2010 txmarshall
      Are you sure about the 4 bolts? Looking at a new OEM replacement Thermal clutch it looks like there's one center attachment allen bolt .just not sure what size allen.
    • Marcus Fenix
      11/18/2010 Marcus Fenix
      Ahh so yours doesnt have one, so its only the center allen nut we have to remove
      Marcus Fenix
      11/18/2010 txmarshall
      Yep the pully has 4 allen bolts connecting it to the fan bearing bracket and the fan is bolted (3) to the T. clutch, but the T.C. Fan assembly only has 1 8mm connecting it to the fan bearing. It's a tight squeez getting bolt,but got err.Thanks for your help
  • Jose
    Jose - 1991 Mercedes Benz 300SEL - Engine - 11/17/2010
    My carr after 10 to 15 min is over heating
    I change the water pump, radiator, fan and take out the thermostat but the car stay heater up
    • txmarshall
      11/17/2010 txmarshall
      Did you ever run the car to the point of Boil Over (spewing water or steam out the overflow hose)?if yes you could have cracked the head and or the block.check the coolant for oil& check oil for coolant,if one is found in thr other,something is cracked,if not it could be the Thermal Clutch fan bad or not working properly or aux. fan not working properly. TC Fan should spin fairly easily when engine is cold and stiff turning when engine is hot,if it spins freely when engine hot,Thermal Clutch needs replacing.Check your owners for spec's on your Mine normally kicks on if temp.gets above 110 deg C. Their are other issues that could be causing your prob. but these are the ones I'd check first.
  • Adrian Button - Australia
    Adrian Button - Australia - 1988 Mercedes Benz 300SE - Engine - 11/17/2010
    Vehicle stops unexpectedly whilst driving normally
    It happens intermittently, with no warning. After a couple of minutes it will start again. No warning lights on dash.
    • txmarshall
      11/17/2010 txmarshall
      Sounds like clogged fuel filter maybe, or fuel pump relay going bad.nexttime it happens ,neel down behind rt.rear tire & have someone turn key to "ON" pos.,you should hear F.P. come on for about 4-5 Seconds if yes it's probably the fuel filter,if not heard,probably F.P.Relay or F.P. going bad. You can run a simple test to find out which one is bad.The relay is located under the hood in the center of the cowling between the firewall&windshield.their are 2 relays there,one is for F.P.the other is AC.FP relay is the one closest to passenger side of car. Remove FP relay&place a jump wire between pin socket's #8 & #10 in the FP relay elect. connector.Then turn key to "ON",you should hear the FP come and stay on,if it does then relat is bad,if it doesn't FP is bad,Either way neither one is cheap. Hope this helps.
  • Bernard
    Bernard - 1988 Mercedes Benz 300SE - Engine - 11/17/2010
    Car needs jump starting and after you cut it off it wont crank again
    bought a new battery
    • txmarshall
      11/17/2010 txmarshall
      Sounds like a short,or something staying on after key switched off.The alarm system on my "88"will drain the batt. after 3-4 mo's but not overnite.I suggest after letting the car sit an hour after driving,then open hood and listen for sounds of anything running or humming.also check in fuse box for hot fusesor hot or buzzing relays.also check the hood&trunk lites,if their hot to the touch when just opening they could be staying on when closed.also feel the different wiring harnesses to see if their hot to the touch.they shouldn't be.Anything you find hot ( fuses.relays wires etc..) is probably linked to your batt. drain. Good Luck. I know what it feels like to have a prob. and can't find it.I really hate taking my "88" to the "EXPERTS" to fix. OUCH!!!!!!
  • hd
    hd - 1984 Mercedes Benz 300D - Engine - 11/15/2010
    Car starts but won't turn off
    This started last week - daughter took it to the mall and it wouldn't turn off. Had her bring it straight home. Anyone know what might cause this?
    • Dave
      11/15/2010 Dave
      Whenever I work on the fuel filter, I invariably knock off a vacuum line near the firewall. Each time I do it, the car won't shut off. It's easy to get to. Almost definitely a vacuum problem.
    • yboy82
      10/4/2010 yboy82
      It is possible that your ignition switch and/or ignition module is defective.
    • tvandeve
      10/20/2010 tvandeve
      Try the link below. Lots of diesel information
    • Ryan D
      10/25/2010 Ryan D
      I know this problem well, it means you have a significant vacuum leak somewhere. If you open the hood, there should be a shuf off switch that you can push and hold for a moment; it is located near the valve cover and air cleaner.
    • Oxides
      10/25/2010 Oxides
      your car has a vacuum leak somewhere, probably at the hose on the ignition switch.

      try locking your doors when you want to shut the car off. just try it. door locks are vacuum controlled and they usually do the trick.

  • mazdaman213
    mazdaman213 - 2002 Mercedes Benz C240 - Engine - 11/13/2010
    What causes my car to shake when I start it up and it continues to shake while in park?
    while driving it shakes and it feels like the fuel pump is going out and when coming to a stop it still shakes with a pull and if I turn my A/C on ,the shaking gets worse and it feels like the engine wants to turn off.
    • Ermel
      11/13/2010 Ermel
      Sounds like a gas or air problem, fill with fresh gas and add a good gas cleaner/dryer.
      Also can be the Mass Air Flow Sensor. If you can clean it yourself do so, if not have a mechanic do it.
  • wd0305
    wd0305 - 2002 Mercedes Benz CL600 - Engine - 11/13/2010
    Why does my car hesitate when I step on the gas?
    • Batman
      11/13/2010 Batman
      You may have a faulty throttle position sensor (TPS). This is the device that tells the computer that you've got your foot on the gas. Depending on your handiness it can be tested rather easily and is probably not very expensive. One for my BMW costs $12.
  • Sikandar Iqbal
    Sikandar Iqbal - 2008 Mercedes Benz E350 - Engine - 11/11/2010
    What engine oil is used and what is service E?
    I have approximately 26, 000 miles on it. I have also observed vibration around 80 miles/hr.
      11/11/2010 MOONSTER_TOOLZ
      Refer to your owner's manual of what are the recommended types of engine oil used for your car. Have your engine scanned to verify what is that "service E" means. Vibrations causes can be identified by the scan tool. You can visit any parts shops that offer free computer scanning to retrieve any stored trouble codes and then have it posted here so that the community will be able to help you in diagnosing your engine trouble.
  • Scott
    Scott - 2006 Mercedes Benz C230 - Engine - 11/10/2010
    When replacing a Balance Shaft?
    I was told that this is the most expensive thing you can do for a mercedes, can i get some help here as to why that is? What is this procedure in detail? So I can justify paying $5300.00.
    0 answer