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Mercedes-Benz engine repair questions and answers

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1722 Questions
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  • shui ma
    shui ma - 2000 Mercedes Benz ML320 - Engine - 9/18/2010
    How to change crank shaft sensor and location of crank shaft sensor
    0 answer
  • larry
    larry - 1995 Mercedes Benz C280 - Engine - 9/17/2010
    What do I do if the timing chain binds when the tensioner is inserted
    145000 miles the engine won't turn replaced the cylinder head
    0 answer
  • larry lord
    larry lord - 2005 Mercedes Benz ML350 - Engine - 9/17/2010
    BAS/ESP light comes on
    When have car ideling in park unable to shift it in drive.Iwill have to turn engine off then start and put in gear right away
    • Gran Turismo 5
      9/17/2010 Gran Turismo 5
      When the BAS/ESP lights come on again, visually check to see that your stop lights are working. If they aren't then you need a new stop light switch. Also try turning the steering wheel all the way to the right and then all the way to the left. This procedure will reset the system. Other than that it could be a multitude of things, too many to go through.
  • camsabe
    camsabe - 1991 Mercedes Benz 500SL - Engine - 9/17/2010
    Please HELP!!! Engine start and keep running at 2700 RPM
    Please HELP!!! Engine start and keep running at 2700 RPM
    • Nissan Technical Advisor
      HI camsabe, my only recommendation for this is to have your engine scanned for proper diagnosis. Knowing the trouble code is best for solving the issue.
  • sarah
    sarah - 2003 Mercedes Benz C240 - Engine - 9/16/2010
    When I push the gas peddle the car hesitates before it want to go.
    • yboy82
      9/16/2010 yboy82
      There are many possible causes for your vehicle’s problem you can narrow it down by diagnosing your vehicle with a scan tool to know if there is a stored trouble code that can lead you to the right direction in fixing your vehicle. The possible causes are

      •defective or incorrectly connected throttle position sensor

      •defective, loose, Mass Air Flow Sensor or Circuit

      •stuck or improperly functioning thermostat choke

      •defective Air Cleaner Temperature Sensor

      •clogged or Dirty fuel filter

      •defective PCV valve

      •worn/defective fuel injectors

      •collapsed/damaged PCV hoses

      •defective fuel pump

      •low fuel pressure
  • Joseph Edgeworth
    Joseph Edgeworth - 2003 Mercedes Benz SL500 - Engine - 9/15/2010
    Needs new crank sensor , only 40,000 miles, does this seem right
  • careaire
    • DrkShdw983
      9/15/2010 DrkShdw983
      The car will run rough after you install a new mass air flow sensor because the computer has to get used to the new (correct) values that the sensor is giving it. The problem will go away on it's own after 100 miles or so. However, I've never heard of the engine quitting after you replace the sensor. Make sure the intake path has no obstructions (hoses aren't binded up, air filter is clean, free of debris, etc) and also that are no gaps or loose fittings where air can enter or leave the system other than where it's supposed to. If that's all good than maybe take it for a good trip (an hour or so of solid running) and that might give it enough break-in where it won't quit. Good Luck!
  • john
    john - 1994 Mercedes Benz SL600 - Engine - 9/14/2010
    When engine gets hot it smells like oxide smoke comes from engine. the EGR ,throttle body are good.
    no leakage in exhaust. idle is good.
    • Ladiesman217
      9/14/2010 Ladiesman217
      Blue Smoke: Blue smoke is caused by engine oil entering the cylinder area and being burned along with the fuel air mixture. As with the white smoke, just a small drop of oil leaking into the cylinder can produce blue smoke out the tailpipe. Blue smoke is more likely in older or higher mileage vehicles than newer cars with fewer miles.

      How did the engine oil get inside the cylinder in the first place? The car has many seals, gaskets, and O-rings that are designed to keep the engine oil from entering the cylinder, and one of them has failed. If too much oil leaks into the cylinder and fouls the spark plug, it will cause a misfire (engine miss) in that cylinder, and the spark plug will have to be replaced or cleaned of the oil. Using thicker weight engine oil or an oil additive designed to reduce oil leaks might help reduce the amount of oil leaking into the cylinder.
  • Tom
    Tom - 1980 Mercedes Benz 450SEL - Engine - 9/14/2010
    Fuel leak by gas tank
    I have a 1976 Mercedes Benz 450 SE. It is leaking gas by the gas tank. It looks like it is coming from a hose that goes into the tank. There is this piece that has 3 hoses hooked to it and it looks like it fits inside the tank.
    • Nissan Technical Advisor
      This is trouble that needs to be fixed immediately, it is best to bring it to a shop for repair.

      I recommend you to use "Find a Shop" feature of AutoMD for shops nearest you
  • astonsa
    astonsa - 1997 Mercedes Benz E320 - Engine - 9/14/2010
    Idle's rough/fluctuates during full stop in drive gear
    Idle's rough/fluctuates during full stop in drive gear
    • Nissan Technical Advisor
      Try to check idle position sensor, & clean your air filter or replace it. But its best to have a computer scan to detect exactly the cause of trouble saving you time and money.

      I recommend you to use "Find a Shop" feature of AutoMD for shops nearest you
  • fady taha
    fady taha - 2006 Mercedes Benz S350 - Engine - 9/14/2010
    Electrical module for my car
    I had an accident wiz my car, and the garage told me that i have to change all the Modules and the cut off electrical module and he didnt start the engine yet, how could i know if i have to do that and pay 5000$???
    • yboy82
      9/14/2010 yboy82
      I don’t have any idea how much damage did your vehicle get from the accident but I suggest to ask other garage for their opinion, before you decide to change anything or pay.
  • Bruce
    Bruce - 1986 Mercedes Benz 190E - Engine - 9/13/2010
    Cold Starting Problem
    When car is cold, it is very difficult to start. Fuel injection system has many valves and can run in the thousands of dollars to change all including fuel injectors. Someone mentioned the cold start valve, but eventually after about 5 full minutes of cranking the ...
    • yboy82
      9/9/2010 yboy82
      Here are the possible causes of your vehicle’s trouble

      •defective fuel injector pressure regulator

      •defective fuel injector cold start

      •fouled spark plug / plug wires

      •defective fuel pump relay

      •failing PCV valve

      •the choke in the carburetor is not operating or faulty carburetor choke float

      •choke thermostat not functioning properly

    • Bruce
      9/10/2010 Bruce
      Hi. Thanks for the response. As it turns out, it was a relay behind the battery area that has a fuse on top of it. It sends an impulse to the fuel injection system. The part cost $76 and has fixed the problem that has plagued my car for many years. One of the indicators to the problem was the trouble lite on the dash. The car now starts with a touch of the ignition key and idles perfectly. I owe it all to the on-line MB mechanic Roy,
      9/13/2010 yboy82
      Cheer's to Roy!
    • yboy82
      9/13/2010 yboy82
      That’s awesome!
  • Capt Paul Rothman
    Capt Paul Rothman - 1986 Mercedes Benz 190E - Engine - 9/12/2010
    Can not get moter mount offf block
    I have removed all the bolts to starter its loose, engine mounts removed, engine mount to block will not come off have removed 3bolts an2 manifold supports cane I see a breakdown of mount to block
    0 answer
  • barbie
    barbie - 1999 Mercedes Benz C230 - Engine - 9/12/2010
    Tourq on replacing timing chain
    head,cam caps,intake and exust manafold
    0 answer
  • Michael
    Michael - 1999 Mercedes Benz C230 - Engine - 9/12/2010
    How can i fix a P0170 Code