Question about 1983 Mercedes-Benz 300-Class
Ensure that there is no misfire. Check that the spark plugs are OK, ensure that there is fuel circulation, and check the air filter adn fuel cap (try removing it for testing).
Check the MAF and AIT sensors. This two sensors detect the air flow mass and the air flow temperature, and determine the amount of air to be mixed with fuel in the injection.
Both sensors are located in the air intake and are both common cause for idleing problem.
Check IAC (idle air control) valve. This opens and closes to let extra air in the mixture when the engine is idleing.
Check the vacuum system. The vacuum system is used to recirculate engine gases. If there is a vacuum leak you get a leaner mixture, resulting in engine running rough particularly at idle, when vacuum makes a bigger difference.
Other problems like a defective EGR valve for example, may affect idle, but will also create big problems when driving.
I think I have listed all problem. If possible pul OBD1 codes using a Mercedes OBD1 scanner (go to authorized garage). Standard OBD2 scanners do not work on this car.
Posted on Sep 12, 2010
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Posted on Jan 02, 2017
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