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Mercedes-Benz engine repair questions and answers

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  • Peter
    Peter - 1988 Mercedes Benz 300SE - Engine - 10/28/2010
    Hard start cold,rough idol cold. smooths idol as temp is reached.
    just bought the car,so I don't really have much history.
    • darkmind
      9/2/2010 darkmind
      It is possible that your fuel injector cold start valve is defective. Also check the condition of your fuel injector pressure regulator, fuel pump relay and your carburetor (if equipped).
      9/2/2010 Peter
      Thanks, those were my thoughts as well.aso, I don't know when filter was changed last,thought that might be adding to the mix. thanks again, I have a few places to start.
    • vince^_^
      9/28/2010 vince^_^
      Your welcome Peter, if any question will arise just post it here and the community will help you.
      9/28/2010 Peter
      No need to thank me if you haven't contributed with an answer. My 300 SE still has the cold start problem. I changed the cold start valve,checked the filter-it's fine,preformed a test on the fuel pressure regulator,it seems to be doing what it should,pulled all the plugs-looked great. still puzzled. I am either going to sell it, or move.Any body want to buy a cream puff of a 300 SE. ( the cream puff filling is getting a little old)
    • Ryan D
      10/14/2010 Ryan D
      Take the car to a MBZ specialist, and he should have a meter that he can plug in to make sure the lambda (air / fuel mixture is set correctly. This is a very simple and inexpensive adjustment to have done; also, it is possible that one or more of the fuel injectors has a problem with leak down, and is not holding fuel pressure in the injector itself, causing a little air in the injector. Once the air is purged out of the bad injector, the car runs smooth. The last couple of answers are worthless, Autozone does not have the diagnostic tools for trouble codes on this car, and the way to check codes is as follows: Next to the battery, there is a little back box about 2" by 3" in size, remove the cover, and you will see a little button. Make sure the car is running, push and hold the button for 3 seconds, count how many times the light blinks, if it blinks only 1 time, there is no codes, if it blinks more than once, record how many times it blinks, and continue to repeat the process to make sure there are not additional codes that come up. To erase any codes, press and hold the button for 10 seconds after the light stops blinking, you man have to do it more than once if there are more than one code present. The 300SE is a very simple car mechanically, and if the problem is fuel related and will be more than likely a plugged fuel filter, or a fuel injector leaking down. Once you have got this problem resolved, I am sure you will be happly with it, as they are extremely well built, easy to work on and inexpensive to service and repair.
    • Mikhelin
      10/28/2010 Mikhelin
      Its one inside Cold Start Valve Unit. Cost somewhere 300.00 bucks at new OEM. do not buy anything below OEM equipment. Go to Ebay and pray to win cheapest Valve.
    • sonny bo
      9/10/2010 sonny bo
      bought a 300d same thing checked glow plugs , two not heating , replaced $22 BUCKS old man learned some thing bout checking them EASY run a wire from hot {+} post on battery tap the glow plug terminal ,{where wire is} spark good = no spark replace
      sonny bo
      9/13/2010 Peter
      Thanks, but my question is regarding my car, a 300se.
    • vince^_^
      10/9/2010 vince^_^
      Did you already diagnose your vehicle with a scan tool to determine if there is a stored trouble code in your vehicle (to verify if there is a fault in your electrical controls and sensors) to help you identify the cause of your vehicle’s trouble. Even if your check engine light if off don’t assume that there is no stored trouble code in your vehicle, to be certain that there is no stored trouble code in your vehicle diagnose it with a scan tool. You can visit AutoZone or nearby auto parts store for free diagnostic if you don’t have any code reader.
      10/9/2010 Peter
      Vince, That is a really good idea.Ck engine light not on, but you are correct,it could still have codes unresolved. I purchased the car shortly before I started asking questions,or for some feedback/helo on here.In other words,the car came with this problem.I wasn't aware of it,as the seller warmed the engine before I showed up to look at it,so... it started,and ran great,and I did steal it in my purchase,regardless of this problem,which I will solve eventually. I will have the codes read,and se
    • darkmind
      10/12/2010 darkmind
      If one of your electrical control or sensor is at fault it will show in your trouble code. Good luck Peter.
  • mmaj16
    • Nissan Technical Advisor
      Check your oil level if low, because insufficient lubrication will allow excessive clearance in the valve train causing a rattling noise.
    • Ryan D
      10/14/2010 Ryan D
      Mercedes uses plastic timing chain guides. Depending on how many miles are on the car, they could be worn down, allowing a little play in the timing chain.
    • Mikhelin
      10/28/2010 Mikhelin
      I believed you have a bad motor/trans mount, or loosen fasteners on motor/trans mount. You cant fix at your own risk. you need somewhere Dealership. Mercedes Dealers will love to see you!
  • hen graham
    hen graham - 2002 Mercedes Benz E320 - Engine - 10/28/2010
    How many spark plugs do it needs it just turned 1000,000 miles
  • hazelwend1023
    hazelwend1023 - 2005 Mercedes Benz E55 AMG - Engine - 10/28/2010
    Battery light staying on in dash workshop. I have replaced alternator & memory battery both new .
    dealer said that the battery relay is bad, but they could not tell me where it was located. I need to know where the battery relay is located. thanks
  • facundo
    • Jason
      10/19/2010 Jason
      Bad battery?
    • Mikhelin
      10/28/2010 Mikhelin
      New alternator must fix this problem...Have you put a new battery? cheap model? Make sure battery is more specified from OEM factory by Bosch rather than unknown gas station down the Route 66. All Mercedes Benz engines need a lot of power to starting ignition than any of v8 cars on the Earth.
  • Mary
    Mary - 2001 Mercedes Benz ML320 - Engine - 10/28/2010
    My car hesitates almost as if it is trying to ignite,when cranking up from a cold start.
    I took it to an auto parts store and they checked the starter and the alternator. Both came up clear.
      10/20/2010 MOONSTER_TOOLZ
      Did you check the condition of your battery and its cables, maybe loose or corroded? Did you also checked if you have fuel pressure or the fuel pump relay is loose or defective? Also, it is possible that your spark plugs are worn to excess or the cables are dilapidated.
    • Mikhelin
      10/28/2010 Mikhelin
      If your battery is good? Go to Cold Start Valve to replace. 2001 Mercedes Benz always reliable with ignition starting. Anyhow, Cold start valve is not cheap , cost new by OEM (Original Equipment Manufacture) Bosch $300.00.
  • jeveridge
    jeveridge - 1980 Mercedes Benz 450SL - Engine - 10/28/2010
    Car has had recent fuel pump and filter after 2 year sit. New fuel and injector cleaner. After engine warmup loses power
    O2 sensor? catalytic converter? Acts like eventual fuel starvation, let sit for 5 min and can continue for another 10 min, then repeat. I did run a full tank of new fuel through thinking injectors were clogged. Any thoughts?
      10/17/2010 MOONSTER_TOOLZ
      Did you replace your fuel filter? When did you replace the catalytic converter? If never, check its condition maybe it’s excessively blocked and damage. Replace the parts if necessary.
    • Mikhelin
      10/28/2010 Mikhelin
      you need Idle Control Valve, Make sure its OEM part, around $280.00 for a part. Dont go at Local Auto Part like PeepBoy Suggest to go either get from OEM Dealership or Original Benz Factory supplies.
  • Larry
    Larry - 1992 Mercedes Benz 300SE - Engine - 10/27/2010
    While driving sometimes my car starts losing power and the ars light comes on.
    I have a 1992 Mercedes with 146,000 miles. Every once in a while while driving, the car will start losing power and slowing down. I have to pull over and turn the engine off for a minute then crank it back up. It runs fine until the next time.
      10/27/2010 MOONSTER_TOOLZ
      Have your engine scanned for trouble codes to determine the exact faults of your engine. I suspect a failing knock sensor or engine misfire is the cause of your engine trouble. Post the codes here, so that the community here will be able to help you in diagnosing your engine trouble.
  • tim
    tim - 1997 Mercedes Benz E420 - Engine - 10/26/2010
    Why do i have to put my car in neutral in order for it to crank
      10/26/2010 MOONSTER_TOOLZ
      Your car is equipped with neutral safety switch that can only be started while the transmission is in neutral position to prevent the vehicle to rum abruptly when it started.
  • Dhenero
    Dhenero - 1989 Mercedes Benz 190E - Engine - 10/25/2010
    Convert from Carbeurator to fuel Injection
    • Ryan D
      10/25/2010 Ryan D
      Your car already has fuel injection
  • MercedezBenz
    MercedezBenz - 1989 Mercedes Benz 300E - Engine - 10/21/2010
    Oil Pan Gasket Transmission Pan Gasket Oil Sending Unit W/ O Ring Valve Cover
    Best Prices On Repairs Already Purchased Parts
  • Alvin Howard
    Alvin Howard - 1984 Mercedes Benz 300SD - Engine - 10/21/2010
    Why does my car hesitate when i step on the gas?
    my car has 180,000 plus miles(the odometer stopped working) The problem usually occurs when temp outdoors is 40degrees F or less. When I am on the expressway it will not accelerate higher than 50mph. If I am on the slightest incline it will deccelerate to 25mph. No ...
    • yboy82
      10/21/2010 yboy82
      The common possible causes of your vehicle’s trouble are plugged/damaged PCV valve, damaged/clogged PCV hose, damaged/fouled spark plugs, defective carburetor (if equipped) and damaged/defective accelerator pump diaphragm (if equipped with carburetor). Diagnose your vehicle with a scan tool to determine if there is a stored trouble code in your vehicle. Even if your check engine light is off don’t assume that you don’t have any stored trouble code. The only way to verify for stored trouble code is using a scan tool to diagnose your vehicle.
    • AWACS E3 Sentry
      10/21/2010 AWACS E3 Sentry
      It maybe because you have a vacuum leak, to look for vacuum leaks, you need to connect a source of compressed air (approximately 10 psi will do it) to the intake manifold with the engine not running and listen for air leaks.

      Hmmm no engine light...

    • yboy82
      10/21/2010 yboy82
      I'm sorry for my answer,your vehicle uses a diesel fuel so your vehicle isn't equipped with spark plugs and carburetor. If its diesel did you consider overhauling your injection pump? The strainer inside your pump may be clogged or dirty.
  • Jolly2
    Jolly2 - 1990 Mercedes Benz 560SEL - Engine - 10/21/2010
    Where is the fuel pump check valve located?
  • 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)?