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Mercedes-Benz engine repair questions and answers

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  • Joe
    Joe - 1999 Mercedes Benz C43 AMG - Engine - 10/21/2010
    My cruise control stopped working. Did a visual check, but found nothing obvious.
    Checked the fuses, but didn't find anything, Didn't even find a reference to the cruise in the fuse box both front and rear. Could use some guidence.
    0 answer
  • Iris
    Iris - 2002 Mercedes Benz C230 - Engine - 10/20/2010
    Left front turnsignal is not working. I replaced bulb but still not working
    • yboy82
      10/20/2010 yboy82
      Did you already check the grounds in your left front turn signal socket/housing (it may be loose/disconnected)?
  • jac
    • Tifosi
      10/19/2010 Tifosi
      For the P0170

      It can be because of Intake manifold vacuum leaks or a faulty MAF or Faulty MAF wiring.

      For the P0441

      It can be because of a bad vacuum switch, broken EVAP canister, open circuit in PCM purge command unit, short in voltage on the purge solenoid, restirction on the EVAP solenoid, corrosion on the purge connector
  • jpdocs2
    jpdocs2 - 2003 Mercedes Benz CLK430 - Engine - 10/18/2010
    At idle it's barely audible (if at all). Acceleration makes sound like a diesel truck 3 lanes away. (See detail below)
    The noise is kinda like a fluttering, as air through a hole (? exhaust system ?); it doesn't really increase in tempo (or loudness) coincident with increased engine RPM. No idiot lights. Engine runs fine and tranny shifts fine. Noise is bothersome, embarrassing, and ...
      10/18/2010 MOONSTER_TOOLZ
      Check if you have exhaust leak. Could be an opening in any exhaust connecting ends; examine the whole exhaust line. Did you smell gas with this scenario?
      10/19/2010 jpdocs2
      Thanks for trying to help! The exhaust system checked out fine, and the shop believes it's sticky valve lifters. It's not getting worse over the 6 months or more that I've notieced it, so I'll just bide my time till I can afford the $750 that a tune-up will cost.
  • adam lee
    adam lee - 1993 Mercedes Benz 300E - Engine - 10/15/2010
    Wire harness for 300e Mbz 1993
    I want to know if i can use a Base Wire harness in place of a 2.8 6 cyclinder engine, is there an alternate or do i just have to use that specified # and make, what is the (4) matic i'm not familiar with that description of the benz.
    • Ryan D
      10/15/2010 Ryan D
      The 4matic is an all wheel drive model. There are some differences from engine to engine, so you do need to use the specific haness number that is called for. There may be some aftermarket harnesses that are a little less expensive, and they should work as long as the parts vender can cross reference the part number to make sure it is comparable to the oem part number. The harness is an expensive repair, but the car should be good for a long tme once replaced. Also, there are 3 or 4 different harnesses on each car, so make sure you are getting the right one. It is quite possible that if one harness is bad, the others may be too, or at least not far from being bad.
  • marvin
    marvin - 1986 Mercedes Benz 190E - Engine - 10/14/2010
    What is the right thermostat for my 190e that will control it from running hot?
    86 Mercedes Benz 190e 2.3
  • Dave
    Dave - 1986 Mercedes Benz 300SDL - Engine - 10/14/2010
    Where is the oil drain plug located
    • Ryan D
      10/14/2010 Ryan D
      If you don't know something that basic, you probably shouldn't be servicing your car. It is located under the plastic drip pan, on the oil pan under the car.
  • Car Help 911
    Car Help 911 - 2001 Mercedes Benz C240 - Engine - 10/14/2010
    Do I need to replace the oxygen sensor what are the best spark plugs to buy and how many?
    Current mileage is: 128,752 My C-240 -2001 occasionally has begun to shut off and at that time all lights illuminate on the dashboard, the car has already crank back up on a shit off. The check engine lights come off and on, it never stays on steadily, I have a BAS ...
    • Pave Low
      10/12/2010 Pave Low
      Ohhh lots of problems

      Problem 1 - We need the code for the CEL. Also your BAS is lighting up so that means it will not activate in a panic stop

      Problem 2 - Im stumped on this one

      Problem 3 - When the car stalling is gradually frequent as the first time it was happened, the possible cause is that the car is suffering from a vacuum leak. Vacuum leak often start out small and gradually becomes worst due to pressure inside the car engine.

      Problem 3 - Denso would be a good brand (Iridium)

      we would appreciate it if you can post the code.

    • Car Help 911
      10/13/2010 Car Help 911
      Okay, I will go back and find the print out I got from the store and post futher details, thanks for your comment I needed this info. :)
    • Ryan D
      10/14/2010 Ryan D
      Look in the back of the owner's manual, it will tell you what spark plugs to buy, and will give you a few different options.
  • hercules
    hercules - 1993 Mercedes Benz 500SEL - Engine - 10/14/2010
    Rough start and rough idle to the point the car want to shut off
    I change the spark plug,the air filter , the spark plug wire, the fuel filter
    • Bobby
      10/14/2010 Bobby
      you'll need to check the senors see if it is a maf sensor preoblem, could be a tp sensor, check for vacuum leaks, check the egr to see if that is sticking.
  • jan
    jan - 1999 Mercedes Benz SLK230 - Engine - 10/14/2010
    Do u carry part # 111 098 00 009 US001
    • Bobby
      10/14/2010 Bobby
      jan this is a forum to ask questions about vehicle repair help and problems. i think you need to call a customer service from whomever you are trying to order from. try the website below
  • John
    John - 2000 Mercedes Benz SLK230 - Engine - 10/13/2010
    My car die's out while driving, it seems to do it when it get hot.
    It usually starts right back up and I drive away. However lately it almost seems like it needs to cool before starting. Someone said the Mass air flow, they said if you unplug while running the car should die out mine does not. Does that mean it bad?
    • Nissan Technical Advisor
      Possibly your temperature or oxygen sensor is giving a false reading to ECU. Have your vehicle scanned for DTC. Visit any parts shops that offers free computer scanning to retrieve the fault codes so we are able to help you better in diagnosing the troubles in your car.
    • shui ma
      10/13/2010 shui ma
      look at the crank shaft sensor. the mercedes benz always have this problem.
  • amada gonzalez
    amada gonzalez - 1990 Mercedes Benz 420SEL - Engine - 10/13/2010
    Sometimes it has a a smell of fuel
    When im onidle and or stopped ready to accelerate
    • Mike
      10/13/2010 Mike
      Sounds like you need to check for fuel leaks first, and you should do it asap.
  • Nathan
    Nathan - 1980 Mercedes Benz 300SD - Engine - 10/13/2010
    How do I remove the heater core
    • Pave Low
      10/13/2010 Pave Low
      What seems to be the problem? Aside from no heat?

      Have you checked your coolant level and monovalve, sometimes these things get stuck.
      Pave Low
      10/14/2010 rewalker58
      air blending flap inoperative
  • Vitaliy
    Vitaliy - 1999 Mercedes Benz ML320 - Engine - 10/12/2010
    Hard start when is cold
    • Nissan Technical Advisor
      Check your battery condition as well as its cables for worn, looseness and corrosion. Check also air filter if blocked and the spark plugs if worn to excess. Consider also EGR valve is stuck open and the temperature sensor is at fault. I also recommend to scanning the ECM for DTC.
  • Herbini
    Herbini - 2001 Mercedes Benz SLK230 - Engine - 10/12/2010
    The BAS/ESP light comes on intermittently. I turn the steering wheel from lock to lock and it goes out.
    but it comes back days later. I know about changing the stop light switch but nave not done that. I can feel no change whatsoever in the cars performance with the light on. Do I have to worry about this? Thank you Herb
    • Pave Low
      10/12/2010 Pave Low
      Yes you should be worried because your BAS (Brake Assist) ESP (Elec stability) might not work in an emergency situation. I suggest bringing that to the dealership.

      In your case since you told me about the sterring wheel move you just did...

      It's a simple problem with naff connections on the steering wheel sensor, and a bit of work with WD40, sandpaper and a soldering iron IN THE RIGHT PLACE to improve electrical connections makes it all go away.

      Or it can be a Faulty brake switch/sensor.

      You might also need to repalce the ESP switch
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