Question about Mercedes-Benz C-Class
You do not state the age of the car or the type or the size of engine or whether it is petrol or diesel. On older E class models a fault in the over voltage protection relay would cause cars to be very jerky in idle. In general on petrol models I would start with the throttle body. Remove the air ducting between the air filter cleaner and the throttle. Make sure the interior of the throttle, the throttle plate and throttle area behind the throttle plate is really clean. Ensure that all all air ducting joints and vacuum lines to the inlet plenum are free of any leaks. On some engine variants the cam sensor oil seal over time can fail allowing oil to contaminate the electrical connection. Thoroughly cleaning the socket and replacing the 'o' ring usually fixes this. On diesels (3.2 CDi etc) the EGR feed pipe from the exhaust manifold around the back of the engine to the inlet manifold can become clogged with soot. Push a frayed bit of hand brake cable through it to clean it; clamping the cable in a drill chuck can make for a very effective flexible interior wire brush around pipe pipe corners etc. Any further information you can provide as per the opening statement would help in the diagnosis
Posted on Nov 10, 2010
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Posted on Jan 02, 2017
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