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Mercedes-Benz engine repair questions and answers

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1698 Questions
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  • 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)?
  • jac
    • Tifosi
      10/19/2010 Tifosi
      For the P0170

      It can be because of Intake manifold vacuum leaks or a faulty MAF or Faulty MAF wiring.

      For the P0441

      It can be because of a bad vacuum switch, broken EVAP canister, open circuit in PCM purge command unit, short in voltage on the purge solenoid, restirction on the EVAP solenoid, corrosion on the purge connector
  • jpdocs2
    jpdocs2 - 2003 Mercedes Benz CLK430 - Engine - 10/18/2010
    At idle it's barely audible (if at all). Acceleration makes sound like a diesel truck 3 lanes away. (See detail below)
    The noise is kinda like a fluttering, as air through a hole (? exhaust system ?); it doesn't really increase in tempo (or loudness) coincident with increased engine RPM. No idiot lights. Engine runs fine and tranny shifts fine. Noise is bothersome, embarrassing, and ...
      10/18/2010 MOONSTER_TOOLZ
      Check if you have exhaust leak. Could be an opening in any exhaust connecting ends; examine the whole exhaust line. Did you smell gas with this scenario?
      10/19/2010 jpdocs2
      Thanks for trying to help! The exhaust system checked out fine, and the shop believes it's sticky valve lifters. It's not getting worse over the 6 months or more that I've notieced it, so I'll just bide my time till I can afford the $750 that a tune-up will cost.
  • adam lee
    adam lee - 1993 Mercedes Benz 300E - Engine - 10/15/2010
    Wire harness for 300e Mbz 1993
    I want to know if i can use a Base Wire harness in place of a 2.8 6 cyclinder engine, is there an alternate or do i just have to use that specified # and make, what is the (4) matic i'm not familiar with that description of the benz.
    • Ryan D
      10/15/2010 Ryan D
      The 4matic is an all wheel drive model. There are some differences from engine to engine, so you do need to use the specific haness number that is called for. There may be some aftermarket harnesses that are a little less expensive, and they should work as long as the parts vender can cross reference the part number to make sure it is comparable to the oem part number. The harness is an expensive repair, but the car should be good for a long tme once replaced. Also, there are 3 or 4 different harnesses on each car, so make sure you are getting the right one. It is quite possible that if one harness is bad, the others may be too, or at least not far from being bad.
  • marvin
    marvin - 1986 Mercedes Benz 190E - Engine - 10/14/2010
    What is the right thermostat for my 190e that will control it from running hot?
    86 Mercedes Benz 190e 2.3