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Mercedes-Benz engine repair questions and answers

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  • crawfordtosha
    crawfordtosha - 2005 Mercedes Benz C240 - Engine - 6/25/2013
    What cause a car to shut down at red light and start back up
     
    0 answer
  • lkibbon
    lkibbon - 1999 Mercedes Benz SL600 - Engine - 6/20/2013
    At what tepprature should the auxilary cooling fan come on?
     
    • Jimm
      6/18/2013 Jimm
      Usually the radiator cooling fans would engage when the cooling system temperature reaches a point at or above the thermostat temperature rating. So, if the thermostat is rated at 195F, the cooling fans would engage at this temperature - or just above this point - to prevent system overheating or boil over.
      Jimm
      6/19/2013 lkibbon
      Thanks. If the fans do not come on what should i check?
    • Jimm
      6/20/2013 Jimm
      The engine coolant temperature sensor is utilized for control of the cooling fan. If the radiator cooling fans do not operate, the issue may be related to; faulty cooling fan switch / temperature sensor, faulty cooling fan relay, faulty cooling fan fuse, faulty cooling fan wiring / connection, faulty cooling fan motor.

      As a first step, check the fuse, relay and wiring for connection and condition. Next, test the fan motor itself by running a jumper wire from the battery positive to the motor - if the motor / fan operates at this point, then you can suspect these items; temperature sensor, wiring, relay, or fuse.
  • dunkkorzan
     
    • HouseCallAuto
      6/19/2013 HouseCallAuto
      If there is no spark present at all on that cylinder then your cause is the ignition wire or distributor cap. You did not mention which is missing.. spark or fuel and you have to know this to proceed.
    • dunkkorzan
      6/19/2013 dunkkorzan
      Spark is there, but i suspect the fuel. At idle it fires occasionally and at cruise without a load i.e. gently easing off the accelerator it seems to smooth out, but withnaload it misses continuosly
    • HouseCallAuto
      6/20/2013 HouseCallAuto
      So just so we are on the same page, have you really sold yourself on #8 being the dead cylinder, because there is no misfire code as the OBDII systems have, so a misfire on a pre '96 vehicle has to be diagnosed the old fashioned way, like removing a plug wire one at a time and seeing the change in engine rpm and shake. When you are at the bad cylinder and you remove the plug wire there is little or no change in engine running. Did you do that and are you convinced that #8 is the only cylinder that clearly has a miss? All the others are good? You also have to check for a vacuum leak near that cylinder also.
      HouseCallAuto
      6/21/2013 dunkkorzan
      The head mechanic at Meyer Ford garage in concordia, MO checked it and replaced the injector and spark plug and the compression was 125 psi. He thought the problem was somewhere prior to those items he checked since there was spark and the injector was good. He didn't wan t to go beyond that without a shop manual, but suspected the fuel distributor. You mentioned a vacuum leak. How would that be checked? I really appreciate your help! Dunk Korzan
  • Tony Lisbey
    Tony Lisbey - 2002 Mercedes Benz C240 - Engine - 6/13/2013
    2002 C240 stalls and ESP light comes on. Restart car, and all seems OK. It seems to happen only when coming to a stop .
    Seems to happen easier when engine is first driven for the day and most of the time when slowing or turning.
     
    0 answer
  • mikeparandian
    mikeparandian - 2000 Mercedes Benz E430 - Engine - 6/13/2013
    Hello every one : power steeling and water pump, also A/c
    I got year 2000 Mercedes E430, run great but get over het and a/c not cooling the sometime so power steeling acting funny is water pump problem , or something earls, is that electronic water pump? please help me on this thanks
     
    • Jimm
      6/13/2013 Jimm
      Loss of coolant because of a coolant leak is probably the most common cause of engine overheating.
      Possible leak points include hoses, the radiator, heater core, water pump, thermostat housing, head gasket, freeze plugs, automatic transmission oil cooler, cylinder head(s) and block.

      A good cooling system should hold 12 to 15 psi for 15 minutes or more with no loss in pressure. If it leaks pressure, there is an internal coolant leak (most likely a bad head gasket but possibly also a cracked cylinder or engine block).
      Not sure what is meant by...'the power steering acting funny'. The E430 4.3L engine uses a standard belt-driven water pump.
  • BillyK3
    BillyK3 - 1987 Mercedes Benz 190E - Engine - 6/12/2013
    How can I fix a high idle speed?
    My idle speed is too high. I think it is a sensor issue because when engine is cold this doesn't happen.
     
    • Jimm
      6/12/2013 Jimm
      Check all the engine vacuum and all air intake hoses as a first step - for leaks / cracks / damage. Replace as necessary. Next step - check the idle speed actuator / idle control valve on the throttle body. Normal Idle speed should be 800-850 RPM.

      Check the many on-line auto parts sources, such as; www.autopartswarehouse, www.carpartswarehouse.com, or www.rockauto.com for the replacement parts. For example, they (Rock Auto) list the idle air control (IAC) valve from around $241.00 for your vehicle. Standard Motor Products part # AC384.
  • george.hunter
    george.hunter - 2006 Mercedes Benz CL500 - Engine - 6/11/2013
    Engine idles high during operation
    70,000 mILES Engine idlenoise very loud all the time
     
    • Jimm
      6/11/2013 Jimm
      Check all the engine vacuum and all air intake hoses as a first step - for leaks / cracks / damage. Replace as necessary. Next step - check the idle speed actuator / idle control valve on the throttle body. Normal Idle speed should be 800-850 RPM.
  • rmacklin
    rmacklin - 1981 Mercedes Benz 240D - Engine - 6/8/2013
    Why does my car continue to run after i cut the car off
     
    • Jimm
      6/8/2013 Jimm
      Most likely due to a faulty starter switch - located behind the ignition lock cylinder.
      Check the many on-line auto parts sources, such as; www.autopartswarehouse, www.carpartswarehouse.com, or www.rockauto.com for the replacement parts. For example, they (RockAuto) list the replacement starter switch from around $17.00 for your vehicle.
  • rmacklin
    rmacklin - 1981 Mercedes Benz 240D - Engine - 6/8/2013
    Why does my car continue to run after i turn it off
     
    • Jimm
      6/8/2013 Jimm
      Most likely due to a faulty starter switch - located behind the ignition lock cylinder.
      Check the many on-line auto parts sources, such as; www.autopartswarehouse, www.carpartswarehouse.com, or www.rockauto.com for the replacement parts. For example, they (RockAuto) list the replacement starter switch from around $17.00 for your vehicle.
  • martin.p.schweitzer.mil
    martin.p.schweitzer.mil - 2007 Mercedes Benz CLK550 - Engine - 6/5/2013
    Runs hot. emp runs just over halfway and moves one level up with the A/C on. Is that normal?
    34,800 miles never been in an accident; just bought it used. I have no owned a Mercedes so don't know the oeprating temp.
     
    0 answer
  • jpagan72
     
    0 answer
  • normsrepairshop
    normsrepairshop - 1990 Mercedes Benz 500SL - Engine - 5/30/2013
    Car cranks fine has no spark,fuel and dash lights (warning lights) are not on
    69.000 miles this started after being stored for the winter ran fine when driven into the garage last fall
     
    0 answer
  • derluv1983
    derluv1983 - 2007 Mercedes Benz C280 - Engine - 6/1/2013
    Check engine light on
    50,000 miles, codes came up as 0016 for cam cencer, 0017 for crank shaft postion censor and 0128 coolant cencer. Auto shop replaced above censor and also the thermostate, claimed it was stuck to open position. Check engine light went off uptil I drove it off the ...
     
    • Jimm
      6/1/2013 Jimm
      Maybe, the relearn sequence should only take around 20 miles or so. If the check engine light does not turn off - have the OBD system scanned again (for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA, etc) to capture any stored fault codes. Post a reply with the fault codes for further assistance.
  • samnangsanok55
    samnangsanok55 - 1994 Mercedes Benz E320 - Engine - 5/25/2013
    During rainning car run shaking &rpm drop?
    when it is hot ,ok, but when it is rainning the car hesitation and the R.P.M drop. the normal idle always stayed at 500 .rpm.
     
    • Jimm
      5/25/2013 Jimm
      Sounds like moisture may be getting into the ignition / coil-on-plug (COP) area. Try this as first step - with the engine dry, remove the spark plug wires and inspect for damage or cracks. Replace as necessary. If no obvious cracks or damage, then apply a thin layer of dielectric to the inside of the spark plug boot to help seal. It may also be damage or cracks on the COP boot - same recommendation - inspect for damage or cracks; replace as necessary.
      Check the many on-line auto parts sources, such as; www.autopartswarehouse or www.rockauto.com for the replacement parts. For example, they (RockAuto) list the coil-on-plug boot for around $6.00 each, and the spark plug boot kit from around $14.00 for your vehicle.
  • cliffordgilliard
    cliffordgilliard - 2007 Mercedes Benz GL450 - Engine - 5/15/2013
    Code for cam shaft problem came on dealer waiting on extended waranty co ok to fix. Dealer had to go int engine for the
    warranty rep to view the part. Vehicle has 50,000 miles should i have dealer replace timming belt and water pump while the engine is open
     
    0 answer
 
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