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Mercedes-Benz engine repair questions and answers

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  • ghazi
    ghazi - 2003 Mercedes Benz C240 - Engine - 12/2/2010
    Why does my car hesitate when i step on the gas ?
    it occurs once in a while it happens when i slow down and try to accelerate check engine light off no other warning lights
     
    • TechSam
      12/2/2010 TechSam
      Make sure your air and fuel filter are new, seems more like air intake issue to me, if it was the TPS throttle position sensor then it would have been flaged.
      TechSam
      12/3/2010 ghazi
      thank you for ur advise.but i will rephrase my question and say:
      why does my car choks when i step onthe gas?
      it happens when i am drivng when i slow down and accelerate again
      could it be a MAF if it happens rarely knowing that filters are knew and no association of any warning lights?
  • AutoMD Member
    AutoMD Member - 1987 Mercedes Benz 420SEL - Engine - 12/2/2010
    The fuel pumps run 4 seconds then dies and it wont keep running it starts then just dies
     
    • txmarshall
      12/2/2010 txmarshall
      find the fuel pump relay,it's in the cowling near windshield.remove it and plug a jump wire between#8&#10 terminal.turn key to on pos. fuel pump should come on and stay on.if it does.relay is bad .if it doesn't use test lite on #8&#10 term's for power,if test is positive.fuel pump is bad.
  • AutoMD Member
    AutoMD Member - 1993 Mercedes Benz 190E - Engine - 12/2/2010
    Temp gage goes up comes close to 120 while in stop and go traffic. It goes back down once the vehicle gets up to speed.
    Haven't let it overheat, too nervous. What can I check first?
     
    • Ladiesman217
      8/13/2010 Ladiesman217
      Looks like your auxiliary fan doesn't speed when it needs to, do this on your drive way, let your car idle, then wait for the aux fan to start, if it doesn't (which is most likely the case) then you just discovered you culprit.

      Either your aux fan is busted or the switch to turn it on is busted (of course the switch is a lot cheaper).
    • tony
      8/26/2010 tony
      also find someone to scan it might save a lot of worry............
    • txmarshall
      12/2/2010 txmarshall
      check your thermal clutch fan at front of engine,should turn fairly easy by hand when cold.check it when engine is hot,if it spins easy it's bad.This will cause overheating in traffic.I had same problem.
  • shui ma
     
    • Isaiah
      9/8/2010 Isaiah
      your distributer is getting to hot and your engine is shutting down are rather how many others see it you may have a cracked blocked and then the engine is done.
      Isaiah
      9/8/2010 shui ma
      ml320 has 6 distributers if one distributer was bed will not stop engine. and i sure do not have a cracked blocked. the engine stop without warning and no check engine light on . the engine run again
      after 30 min and temp never over 85*c
    • txmarshall
      12/2/2010 txmarshall
      check the coolant temp. sensor,if it's going bad it could be sending false info to PCM.
  • Kathy
    Kathy - 1994 Mercedes Benz E320 - Engine - 12/1/2010
    All warning indicator lights are on when i try to start the car
    car does not start
     
    • Autobahn
      12/1/2010 Autobahn
      Get your car scanned then post the code here
    • Mikhelin
      12/1/2010 Mikhelin
      Possible computer control unit, be careful its cost 2 grands. Or Main Switch cost 99.99
      Mikhelin
      12/2/2010 Autobahn
      Ey Mikhelin, looks like you are an expert on benzes, im curious though, i was once told that the ECU will tell you whats wrong without even scanning it, it will show on the dashboard, is it applicable to this year or later models?
  • gamstarinc74
    gamstarinc74 - 1992 Mercedes Benz 500SEL - Engine - 11/29/2010
    Can i put a remote starter and an alarm in a 1992 mercedes benz 500sel,
    if the original remote comes with a first generation infrared
     
  • marchristx98
    marchristx98 - 1995 Mercedes Benz C220 - Engine - 11/29/2010
    Engine light on as soon i step on the brake to shift gear but turns off when i sut down ignition and come back on again
    also the SRS light on
     
    • yboy82
      11/29/2010 yboy82
      I suggest that you diagnose your vehicle with a scan tool to determine if there is a stored trouble code in your vehicle and to know if all your electronic controls and sensors are working fine. You can visit this link to have an idea how to perform it http://www.automd.com/.../

      yboy82
      11/29/2010 marchristx98
      Thanks..I`ll check on to that.
  • jack
    jack - 1991 Mercedes Benz 300E - Engine - 11/26/2010
    I have engine oil in my coolant
    My 1991 2.6 300E has engine oil leaking into the coolant system. Where is the oil getting through into the coolant and what is involved to remedy this?
     
    • Bill
      11/26/2010 Bill
      Generally it is a blown head gasket water port seal.
    • scotty306134
      11/26/2010 scotty306134
      If engine has an oil-water cooler it may be leaking.
  • gamstarinc74
    gamstarinc74 - 1992 Mercedes Benz 500SEL - Engine - 11/24/2010
    Why does my engine stop when i start to drive off....when i press the accelerator
    changed air filters, air mass sensor, transmission and spark plugs
     
    • MOONSTER_TOOLZ
      11/24/2010 MOONSTER_TOOLZ
      Did you check the engine with a scan tool already? Fuel may not be properly delivered under correct pressure due to clogged fuel filter and defective fuel pressure regulator. Replace the filter and check the condition of the fuel regulator. CPS play a big part in this problem, have it checked by a scan tool to verify this.
    • yboy82
      11/24/2010 yboy82
      When you replaced your air filter did you also check and clean your fresh air intake hose (visit this link to see an image of it http://images.google.com/images)? If, your fresh air intake hose is damaged or clogged it can cause you vehicle to stall when pressing your accelerator pedal. Also a clogged fuel filter and fuel injector can also cause it.
      yboy82
      11/24/2010 yboy82
      A defective throttle position sensor can also cause it.
  • gamstarinc74
    gamstarinc74 - 1992 Mercedes Benz 500SEL - Engine - 11/24/2010
    Why does my engine stop when i start to drive, when i press the accelerator
    changed, air filter, spark plugs,air mass sensor and transmission
     
    • MOONSTER_TOOLZ
      11/24/2010 MOONSTER_TOOLZ
      Did you check the engine with a scan tool already? Fuel may not be properly delivered under correct pressure due to clogged fuel filter and defective fuel pressure regulator. Replace the filter and check the condition of the fuel regulator. CPS play a big part in this problem, have it checked by a scan tool to verify this.
      MOONSTER_TOOLZ
      11/26/2010 gamstarinc74
      yes, the mechanic i took it to only found the air mass sensor was broken, which i've already changed, but i will change the fuel filter and the injector and see how it gonna come out
    • yboy82
      11/24/2010 yboy82
      When you replaced your air filter did you also check and clean your fresh air intake hose (visit this link to see an image of it http://images.google.com/images)? If, your fresh air intake hose is damaged or clogged it can cause you vehicle to stall when pressing your accelerator pedal. Also a clogged fuel filter and fuel injector can also cause it.
      yboy82
      11/24/2010 yboy82
      A defective throttle position sensor can also cause it.

  • Tina Clark
    Tina Clark - 1981 Mercedes Benz 380SL - Engine - 11/24/2010
    Why does my fuel pump "hum" but won't start my car?
    Replaced fuel pump, fuel filter, and accumulator. Getting fuel to injectors, but fuel won't spray from them.
     
    • yboy82
      11/24/2010 yboy82
      Did you already inspect your fuel injectors? It is possible that your fuel injectors are already defective and the only way to verify it is by inspecting your fuel injectors.
    • Autobahn
      11/24/2010 Autobahn
      So the fuel reaches the injectors but it wont spray from them...Logic tells me that's its the injectors (Big Surprise), i first thought that you just have a kink in the line until i read the Fuel injection part.

      So these are the things i suggest you do...(Its all listed on this website).

      http://www.aa1car.com/library/2004/us80414.htm
  • donald lalor
     
    • vince^_^
      11/24/2010 vince^_^
      Yes, your valves will crashed into your pistons if your timing belt broke it will have the same damage as a gasoline engine, because the difference between the two are its ignition system, fuel delivery system and fuel. But the working mechanism in your engine is the same.
  • robert
    robert - 2000 Mercedes Benz SL500 - Engine - 11/23/2010
    Where is the engine oil filter? is it at the top of the engine, a cylinder thingy with a black plastic cap?
    how to change oil filter (cartridge?)
     
    • Autobahn
      11/23/2010 Autobahn
      Ohhhh one of the nicest coupes ever built, these cars dont get old, they become classics, now with your question, its on the passenger side of the engine front just under the intake hose. To get the old filter off, you need to use a 13 swivel and a long extension. There are 2 lines on the replacement filter and it is important to make sure that the top line is covered by the assembly - in otherwords, make sure the cartridge is pressed all of the way to the top of the housing. The oil filter had 4 rubber O ring gaskets which should be replaced as well. Most late MBs have just the cannister. Now, go to a local marine store and buy a topsider to suck all the oil from the dipstick tube. No mess :)
    • Nissan Technical Advisor
      Yes, it was the oil filter casing or cartridge. Can you tell why you would like to replace the cartridge? Is it leaking on top or in the side of the cap? Replacing the oil filter is easy; you have to remove the cap counter clockwise using an oil filter removal (size vary) or a combination of cap and ratchet with an extension rod. The engine should be cold to prevent burns. Remove the oil filter by pulling it upward (rags should be handy to prevent spills down to the engine parts and accessories). Attach the oil filter with its new seals (oil seals/gaskets are included when you buy the oil filter) and then tighten it. Fill the oil in the engine and start the engine to check for leaks (make sure the drain plug is set already).

      Good luck and work safely!
  • lakeisha
    lakeisha - 1999 Mercedes Benz ML320 - Engine - 11/23/2010
    Where is fuse box located
     
    • Autobahn
      11/23/2010 Autobahn
      It should be under the hood on the drivers side firewall, or underneath the driverside steering wheel, most cars today have 2 boxes of these types which some mistaken for a fuse box. Usually the one on the hood is the junction box where all the relays are hanging out and there is the fuse box. It may or may not be in one place (junction and fuse box) but those are the only locations that most cars including yours are.
  • Ray
    Ray - 2003 Mercedes Benz C230 - Engine - 11/23/2010
    What can I expect to pay for a timing chain and tensioner replacement?
    Is this a problem generally cause by not replacing the timing chain as a service item instead of waiting until it broke? Thanks
     
    • vince^_^
      11/23/2010 vince^_^
      The estimated labor time for a timing chain replacement is 3.9 – 4.4 hours and for the timing chain tensioner is around 0.9 – 1.2 hours.

      If you have a non-interference engine you won’t have a problem when your timing chain will broke BUT if your engine is an interference means that when your valves stop moving (due to a broke timing chain) it will damage your pistons and the valves itself.