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First car - '91 Mercedes 190E (W201)

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  • #16
    Okay, first 'major' thing I wanna take care of is give the fuel system a good allround service.

    Being old as hell, I suspect the fuel system isnt in its best shape.

    Not really liking its efficiency right now.

    I filled up 33L of 91 unleaded when tank was just before empty and reset the milage counter.

    The fuel light is gonna go on any minute now, and its only done 155km (city driving).

    Lets say its used 30L so far, that brings down the fuel economy to:

    19.35L/100km or 12.1mpg (US Gallon) which is terrible, especially for a 1.8 engine - pretty much double the consumption it should be going at.

    I began researching on the issue, and many with similar issues seem to be having slow acceleration, and now that I think about it, the acceleration is really sluggish.

    Research suggested its a fuel issue possibly caused by: Air Flow Meter (AMF), Electro-Hydraulic Actuator (EHA), Oxygen Sensor, Fuel Injectors, etc...

    Some info that may be relevant:

    -Starts first time every time without a problem (even cold).
    -Rough idle/Engine vibrations, sometimes more than others (engine mounts are probably worn though).
    -Clean exhaust, minimal carbon deposits.
    -Sometimes has rich fuel smell, most noticeable after opening engine bay.
    -Pressure "pop" when I open fuel cap.

    Suggestions?

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    • #17
      Who needs a tacho when ya got an awesome clock like that

      Fck yeah !
      sigpic

      Comment


      • #18
        Originally posted by MKD View Post
        Okay, first 'major' thing I wanna take care of is give the fuel system a good allround service.

        Being old as hell, I suspect the fuel system isnt in its best shape.

        Not really liking its efficiency right now.

        I filled up 33L of 91 unleaded when tank was just before empty and reset the milage counter.

        The fuel light is gonna go on any minute now, and its only done 155km (city driving).

        Lets say its used 30L so far, that brings down the fuel economy to:

        19.35L/100km or 12.1mpg (US Gallon) which is terrible, especially for a 1.8 engine - pretty much double the consumption it should be going at.

        I began researching on the issue, and many with similar issues seem to be having slow acceleration, and now that I think about it, the acceleration is really sluggish.

        Research suggested its a fuel issue possibly caused by: Air Flow Meter (AMF), Electro-Hydraulic Actuator (EHA), Oxygen Sensor, Fuel Injectors, etc...

        Some info that may be relevant:

        -Starts first time every time without a problem (even cold).
        -Rough idle/Engine vibrations, sometimes more than others (engine mounts are probably worn though).
        -Clean exhaust, minimal carbon deposits.
        -Sometimes has rich fuel smell, most noticeable after opening engine bay.
        -Pressure "pop" when I open fuel cap.

        Suggestions?
        Start of with an entire bottle of injector cleaner. The injectors will be dirty. MAF (mass air flow sensor) will probably need attention too. While you're at it, check the air filters, and clean the sensor with the specialised sensor cleaner products (its very delicate to clean)

        The rich fuel smell seems like it'd be running a little rich, as is the tendency for 'rough idle'. I will also point out that you take a look at the condition of the spark plugs, and spark plug leads.

        Essentially, I'd take on those things there, it isn't too expensive, and while you are at it give the car a service unless you haven't already (radiator, engine oil, filters, and check the gearbox oil.

        Do all of these, they are quite manageable on these cars and won't be too expensive. You shouldn't experience problems after that. If the mounts are worn, I'd replace those too, if you can't do it properly get a good mercedes mechanic to do it (not just anyone). It'll help with the response, acceleration and overall driveability of the car, as well as fuel consumption even.

        And in the future, I'd use injector cleaner every 3,000k's.

        Hope that helps.


        As JDM as Sauerkraut



        1994 Audi 80 V5 Quattro
        1997 Audi A4 1.8
        1994 Mercedes-Benz C180
        1989 Mercedes-Benz 300CE
        1994 Mercedes-Benz C220
        1992 Mercedes-Benz 400SEL
        1994 Mercedes-Benz S420
        1997 BMW 525i
        1982 Mercedes-Benz 280E
        1995 Mercedes-Benz E320
        Future:
        I need to stop buying cars...


        Comment


        • #19
          Originally posted by Mcmerc01 View Post
          Start of with an entire bottle of injector cleaner. The injectors will be dirty. MAF (mass air flow sensor) will probably need attention too. While you're at it, check the air filters, and clean the sensor with the specialised sensor cleaner products (its very delicate to clean)

          The rich fuel smell seems like it'd be running a little rich, as is the tendency for 'rough idle'. I will also point out that you take a look at the condition of the spark plugs, and spark plug leads.

          Essentially, I'd take on those things there, it isn't too expensive, and while you are at it give the car a service unless you haven't already (radiator, engine oil, filters, and check the gearbox oil.

          Do all of these, they are quite manageable on these cars and won't be too expensive. You shouldn't experience problems after that. If the mounts are worn, I'd replace those too, if you can't do it properly get a good mercedes mechanic to do it (not just anyone). It'll help with the response, acceleration and overall driveability of the car, as well as fuel consumption even.

          And in the future, I'd use injector cleaner every 3,000k's.

          Hope that helps.
          I'll look into all of those soon (when I have a bit more time on my hands), but just earlier today I took a look around and did this:

          Took off the air filter box and took a look underneath, this is what i found

          Photo Album - Imgur (gallery)

          I first noticed the breather hose was quite loose, and after pulling it out, it noticed that most of its circumference had been broken off, but it appears that it has been intentionally cut out...(no idea why).

          And I noticed that the engine and surrounding components are quite oily, you can see in the images along the line of the engine cover theres a deposit of oil

          The fuel distributor, EHA, ICV, etc all seem to have oily residues.

          After playing around with the breather hose it cracked (added it to my list of new things to buy), but in the meantime i put a bit of strong super-glue adhesive that seems to hold it well (for now).

          I put one of those worm drive rings ( http://www.gd-wholesale.com/userimg/...clamps-682.jpg ) around the broken end of the breather hose, seems to be held tighter now.

          After I started it up, noticed white smoke come out of the exhaust when revved higher, but after a spin around the block, the smoke stopped, just clear exhaust afterwards.

          Idunno what else to do right now, those are my observations, thoughts?
          Last edited by MKD; 25-07-2012, 10:58 PM.

          Comment


          • #20
            UPDATE

            jacked up the car earlier and found the damn O2 sensor. I dont have a multimeter to check whether its giving an acceptable voltage range, but I did try and unscrew it to check if it was burnt out... no luck.

            Drowned the thing in WD-40 and didnt wanna budge

            Comment


            • #21
              Ok, white smoke generally isn't something to worry about, it could be running a little rich.

              Blue smoke is when you have problems. Replace the hose, get a new one, make sure all the connections are tight. Clean up ALL the oil, everywhere and then attach the new hose. Afterwards, drive the car for some time, then check if there are any deposits of oil. Most likely cause is the pipe letting out oil. What you're doing here, is trying to locate the cause of the oil, so its important you clean the oil as well as possible before putting the pipe. Let me know what you find here (a week after putting the new pipe should be enough)

              Generally, if you are leaking oil from the front of the engine, then its not too bad... if it leaks from the back of the engine block, then its a headgasket. But don't think too much about this part, that will come later, and its not very likely.

              If you can't remove the o2 sensor, go to a mechanic and have them remove it for you, they're a pain in the ass at times. If its become stuck like that, then you can bet that if hasn't been touched for a very long time= needs to be replaced.


              As JDM as Sauerkraut



              1994 Audi 80 V5 Quattro
              1997 Audi A4 1.8
              1994 Mercedes-Benz C180
              1989 Mercedes-Benz 300CE
              1994 Mercedes-Benz C220
              1992 Mercedes-Benz 400SEL
              1994 Mercedes-Benz S420
              1997 BMW 525i
              1982 Mercedes-Benz 280E
              1995 Mercedes-Benz E320
              Future:
              I need to stop buying cars...


              Comment


              • #22
                Originally posted by MKD View Post
                UPDATE

                jacked up the car earlier and found the damn O2 sensor. I dont have a multimeter to check whether its giving an acceptable voltage range, but I did try and unscrew it to check if it was burnt out... no luck.

                Drowned the thing in WD-40 and didnt wanna budge
                Spray some liquid wrench into where the threads are, then hit the bung that the sensor is in with a torch for a minute or so, should come out then. Replacing the o2 sensor is always a good idea, should be changed as much as the oil filter or air filter. When you put the new one in, make sure you have some anti-seize on the threads, if it doesn't come with any, but a tube of it, it's your best friend.

                I do have a few pics of my car btw, since you asked. Heres a link to my thread, keep in mind that it was $450.

                http://forums.mightycarmods.com/show...0E-slushomatic.

                Comment


                • #23
                  I drive an 89 190E 2.6. I absolutely love it. Right now I am in the process of getting some body work done and a paint job, then I might look at doing some small mods.... but nothing big. It's just a lovely car overall though.

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