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Mercedes-Benz engine repair questions and answers

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  • 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
  • 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
 
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