Auto Answers » Engine » Mercedes-Benz » Page 10

Mercedes-Benz engine repair questions and answers

Post your Mercedes-Benz engine question or share what you know by answering questions

1705 Questions
Sort by:
  • 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
  • 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
  • monique_adams2001
    monique_adams2001 - 2001 Mercedes Benz C320 - Engine - 5/12/2013
    Why when driving you give the car gas and nothing happens.
     
    • Jimm
      5/12/2013 Jimm
      First step - have the check engine light or stored fault codes scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA. Then, post a reply as 'add answer' for more assistance.

      Possible Causes of Engine Hesitation or Stumble:

      Dirty fuel injectors (cleaning the injectors often fixes this)
      Dirty air filter (change filter)
      Dirty / clogged fuel filter (change filter)
      Bad MAP (manifold absolute pressure) sensor
      Bad TPS (throttle position) sensor
      Bad or dirty MAF (mass airflow) sensor
      Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
      Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
      Bad gasoline (fuel contaminated with water or too much alcohol)

      Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

      Dirty or worn spark plugs
      Bad plug wires
      Weak ignition coil
      Wet plug wires
      Jimm
      5/14/2013 monique_adams2001
      I was told it could be the fuel rail. Would that fall under the same guide lines of fixing it with the above suggestions?????
    • Bill
      5/12/2013 Bill
      If engine RPMS climb and engine revs, then transmission the culprit. You really haven't given us a lot to work with.
  • Bernie
    Bernie - 2000 Mercedes Benz CLK320 - Engine - 5/12/2013
    Rough idle and stalling. What is wrong?
    176,000 miles running on rough idle and stalling. Replaced all original Bosch Ignition coil packs, wireset, sparkplugs, injectors, MAF & Crank position sensors, gas and fuel filters. Still runs rough idling and stalling. Fuel pressure is at 57 psi on idle. ...
     
    • Bill
      5/12/2013 Bill
      Sure sounds like a vacuum leak. Recheck all vacuum hoses and if any seem marginal, replace, also replace PVC valve and vacuum line. Could also be a stretched timing chain/belt or tension er. Let us know what you turn up.
      Bill
      5/14/2013 Bernie
      I usually check vacuum leaks by spraying choke carb spray over possible points where vacuum takes place like intake pipes, hoses, injector seats, brake servo etc, with vacuum guage hooked up. idle would normally change but no reaction so far but a persistent misfire. I will be checking the cable connector to the crank position sensor. I have consulted 5 major MB dealer technicians and no one has ever resolved the issues. The mileage is low for chain to get streched on MB engines.
  • beta10191962
    beta10191962 - 1995 Mercedes Benz SL320 - Engine - 5/9/2013
    How to replace warning dash lights
    when starting the car several warning lights do not come on. All warning lights should come on and then go off each time the car is started.
     
    0 answer
  • krtherapper
    krtherapper - 2001 Mercedes Benz S430 - Engine - 5/4/2013
    Throttle/pedal possition sensor not working?
    i replaced the pedal/sensor and my car is not reading it. what do i do next?
     
    • Jimm
      5/4/2013 Jimm
      There is no programming required for the throttle position sensor (TPS) - there may be an issue with the TPS connector or wiring to / from the sensor itself - down by the accelerator pedal on the interior floorboard.
  • krtherapper
    krtherapper - 2001 Mercedes Benz S430 - Engine - 5/4/2013
    Throttle possition sensor i purchased another one and car is not reading it.
    just wondering how does it work? do i have to do something to make it work or do i have to bring it in to a shop to have that pedal reprogrammed back.
     
    • Jimm
      5/4/2013 Jimm
      There is no programming required for the throttle position sensor (TPS) - there may be an issue with the TPS connector or wiring to / from the sensor itself - down by the accelerator pedal on the interior floorboard.
  • home
    home - 1990 Mercedes Benz 190E - Engine - 5/2/2013
    Is the eha actuator adjustable
     
    • Jimm
      5/2/2013 Jimm
      Yes, the EHA (electrohydraulic actuator) for the valves is self-adjusting during operation. It's designed to tweak the mixture either lean or rich depending on changing conditions and O2 feedback. It is a fuel pressure regulator that adjusts the fuel mixture depending on certain conditions.This valve is used to control the flow of fuel to the fuel distributor.
      If this valve fails, you may notice poor idle, lack of power, or a vehicle that will not start at all.

      The EHA is adjustable but only affects the lower part of the fuel distributor. You'll need a gauge with the proper metric fitting to test the upper and lower fuel distributor pressures to compare the difference.
  • greenlofts
    greenlofts - 2000 Mercedes Benz E320 - Engine - 4/18/2013
    My car runs fine when I first start it up, 10 min or so later it turns off and want start. It turns over maybe fuel pump
    When car set for 30min or so it start up again
     
    0 answer
  • katins
    katins - 1999 Mercedes Benz ML430 - Engine - 4/5/2013
    What tools do i need to repair head gaskets
    13000 miles. was told that it needed heads
     
    • Mike
      4/5/2013 Mike
      Replacing head gaskets is not an easy DIY job. The first tool you need is a repair manual.
  • larryking4605
    larryking4605 - 2003 Mercedes Benz C320 - Engine - 4/5/2013
    What could be the cause of failure to start on cold mornings?
    The car starts normally and runs well except for cold weather. It cranks and tries to run but dies and seems to be flooded. When it does start it smokes and I smell gasoline. It also sometimes idles roughly when stopping at a stop light. It runs fine the rest of ...
     
    • Ben in Joppa
      4/5/2013 Ben in Joppa
      It could be the catalytic converter building up. Getting gunked up and causing too much back pressure. Could be as simple as a few taps with a hammer to free up debris in cat or res. Or, take it out and drive it like you stole it for a little while and try to burn the carbon build up out of there. Hope that helps.
  • MBny
    MBny - 2003 Mercedes Benz C230 - Engine - 4/3/2013
    What should I expect?
    Hello...my check engine light came on, I went to autozone and they gave me the codes: p0126, p0600, and p0456.I don't drive this car everyday so I don't know if the temp will correct itself when it warms up. I have to get my oil changed and will have the mechanic ...
     
    • HouseCallAuto
      4/3/2013 HouseCallAuto
      First thing you do is buy your own code reader at amazon for $21. Buy it here >> http://www.amazon.com/.../ref=sr_1_1

      Now it takes 2 minutes to read codes, no reason why you have to go to AZ. AZ has a no-erase policy. You can plug in the reader and erase the codes and now do nothing. Wait and see what codes return and then act on them. The code P0126 does not appear to be a valid code that is applicable to this vehicle. It is a code for real, just not for this year, make and model. Maybe you read it wrong? Maybe was a P0125? The P0456 will likely be a small leak from a evap hose. The P0600 just means that you have codes present. The P0600 will go away when the other two codes are solved. cannot quote this until you answer about P0126
      HouseCallAuto
      4/4/2013 MBny
      Hi, thanks for your response. Sorry that was a typo, the code is p0128. I already went to AZ but I will pick up a reader. The guy at AZ printed out receipts with the codes on them and he told me that the receipts may say Volkswagon but it can apply to my car as well.
      HouseCallAuto
      4/4/2013 HouseCallAuto
      The P0128 is a stuck open thermostat (the engine is running too cold) so change the stat.
      HouseCallAuto
      4/5/2013 MBny
      Thank you, will do.
      HouseCallAuto
      4/8/2013 MBny
      Hi again, I got the code reader and I am having a problem with it. I goes through the first five steps fine (from CAN- to ISO) I get LINK ERROR! then it either quickly goes back to the main screen or it has said NO CODES twice. I'm not sure what to do next.
      HouseCallAuto
      4/10/2013 MBny
      In case anyone else reads this, if you have the same problem with the code reader that I mentioned, when it comes to the part of the instructions in the manual that advise you to turn your key but not start your engine...ignore it, start your engine and the reader should work from there. I'm learning! lol