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lmedrano
lmedrano 4/3/2012
1990 Mercedes Benz 300E 2.6 6Cyl2.6L - Engine
Why is my car having trouble starting up and hesitating when I step on the gas?
I just bought my car about 4 months ago and it has trouble starting up, especially when then engine is really cold. I rev the engine and when I put it on reverse it tends to just turn off. The temperature gauge also takes a while to get warm and if it is cold my car will turn off completely at stop signs and stop lights. I usually shift to neutral and rev it a tiny bit so it wont turn off but it is turning into a problem. Once the engine starts to heat up sometimes the temperature gauge will start to jump around going from really hot to normal but the car runs good and the engine doesn't smell burned. I have recently changed the oil filter, which was really dirty, but it is still having this problem. The car is in really good shape and I'm thinking it may be the carburetor. No lights are on at all and the car has a new engine. Thank you for any help you can provide!
2 Answers
  • Jimm
    Jimm 4/3/2012
    Possible Causes of Engine Hesitation or Stumble:

    Dirty fuel injectors (cleaning the injectors often fixes this).
    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
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    Jimm
    lmedrano 4/3/2012
    Thank you so much for answering my question! I'm going to check some of these problems as soon as possible! Thank you!!!
  • guttaman365
    guttaman365 2/4/2013
    My 89 mercedes 300e has the check engine light comes on and off. When its on the car sputters and doesnt want to accelerate. What can this problem be?
    Reply
    0
    guttaman365
    Jimm 2/9/2013

    Possible Causes of Engine Hesitation or Stumble:

    Dirty fuel injectors (cleaning the injectors often fixes this).
    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 ign
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