Surging on 300E 1993 Mercedes - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 06-18-2010, 04:05 PM Thread Starter
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Surging on 300E 1993 Mercedes

Any advise on diagnosing what the problem I am having on my Mercedes 300E 3.2 1993 model will be most appreciated. At idel there is a slight amount of rpm surge. The car will run well untill 3000rpm then loose all controll over engine speed. I have changed the control relay, which was defective, and have had the electronic throttle actuator checked, however; the car still has the problem.
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post #2 of 6 (permalink) Old 06-19-2010, 09:00 AM
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Read the fault codes on the 16 pin connector in the engine compartment.
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post #3 of 6 (permalink) Old 06-19-2010, 09:10 AM Thread Starter
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Thank you Deanyel. I will do as you suggest and let you kno the result. I hope that this is the problem.
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post #4 of 6 (permalink) Old 06-19-2010, 09:20 AM
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This previous post consolidates links to resources including schematics for building and inexpensive code reader, code listings and accumulated wisdom, much of it from discussions on the Peach Parts forum. I believe this will be helpful with a '93.
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post #5 of 6 (permalink) Old 06-19-2010, 04:49 PM
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When you say you "lose all control over engine speed", do you mean there is no response to the throttle or that the engine speed is just sporadic?

Felicita e un bicchiere di vino con un panino.
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post #6 of 6 (permalink) Old 06-19-2010, 06:10 PM Thread Starter
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The car has a slight surge when ideling but the engine works fine untill it reaches 3000rpm. Thats when it starts to surge between 2800 and 3150rpm. It wont go beyond that. I have change the control unit, the overload relay, and the wireing on the electronic throttle actuator, but the problem persists. I have also taken it to be diagnoised by Mercedes dealer ship here in Maracaibo Venezuela and they tell me that they is nothing wrong with the car. The engine has also had new plugs, and cables installed. Thanks for asking.Any ideas you may have will be well received.
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