Question about 1995 Mercedes-Benz E-Class

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No power over 1500 rpm, and rough( very hard ) shift of trans

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  • ejd3rd724 Dec 31, 2010

    I already have changed the fuel filter, air filter, and the plugs.
    Any other suggestions?

  • ejd3rd724 Dec 31, 2010

    Are you sure about the pressure values? My Chevy's and Fords run 50psi plus!

  • ejd3rd724 Jan 01, 2011

    The statement about the pressure leads me to believe the "expert" is not as informed as he should be in regards to my "car problem"

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  • Master
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Given that this is an "older" model, have the exhaust checked by a reputable exhaust shop to check for clogged catalytic converters. One way for you to tell is to run the engine (run it around the block if you can), look underneath and see if any component of the exhaust is glowing. If it is, replace the "cats". You can also check the fuel filter which will cause a poor performing engine and an extereme loss of power. This is likely located in the fuel tank. Another item is the transmission being stuck in a higher gear. Use the trans as a last resort. Is there a "check engine" light on? If so, have it scanned for codes. If not, likely "cats" of fuel supply issue. Have the spark plugs ever been changed? If not, give them a look. It could be simply a good "tune up" (change spark plugs/wires). Bosch is highly recomended and not the platinum.

Posted on Jan 01, 2011

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  • Mercedes-Benz Master
  • 2,007 Answers

First thing to try is changing the fuel filter. It sounds like it's starving for fuel, and causing it to lose power, which also causes the transmission to act up.

Posted on Dec 31, 2010

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  • Dar
    Dar Dec 31, 2010

    First of all, your post doesn't state whether or not you have an engine light on. Most of the following problems would have an engine light with them, however, possibly not if the fuel pump is weak, or losing pressure. I suggest you check the fuel pressure with a pressure gauge. After you connect the gauge to the fuel rail, turn the key to "on", engine not running. The pump should run for 2 or 3 seconds. Note the reading on the gauge. It should hold steady at about 9 to 13 lbs.
    Then start the engine and let it idle at normal operating temperature. It should be lower by 3 to 10 pounds. If all the readings are within the limits, it's operating properly.
    Try that, and let me know.

  • Dar
    Dar Dec 31, 2010

    Other than that, it could be electrical. Could be a faulty coil, tranny fluid level, emissions, or bad fuel. But, see how the fuel pressure is fist. Good luck.

  • Dar
    Dar Jan 01, 2011

    No. I'm not sure about the lbs. In any event, see if it holds pressure. I'll do more checking.

  • Dar
    Dar Jan 01, 2011

    Yeah. Sorry. I was reading the wrong line. 270 kPa to 400kPa. (approx. 38 - 60 psi).
    Could also be the fuel pressure regulator.

  • Dar
    Dar Jan 02, 2011

    270 kPa to 400kPa. (approx. 38 - 60 psi). Sorry about the screw up. I read the wrong line.

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