1992 Mercedes-Benz 300E Q&A
1992 Mercedes-Benz 300E Question: rough idle
Was it only the coolant flush that made the engine idle rough? If so changing the fuel filter shouldn't affect anything. Could water have got on ignition components or a vacuum hose or electrical connection have been knocked off. If it idled smooth previously nothing should have changed. Some cars get air locked and pockets of air in the cooling system will dissipate after a while running the engine with the heater control on full hot, and allowing the engine to idle frequently topping up the coolant level as required. After that there would be too many possibilities to guess at or express an opinion on what may be the problem without being able to carry out some tests first hand. - patrick mannion
You need to check for error codes first. Clear each one individually, one by one, then drive as normal and the true errors will register again, thus triggering, or not triggering the check engine light. The error code will you to the right area to troubleshoot the problem correctly. AB - Visitor
trouble getting car to stay idled, it cuts off after taking foot of gas pedal
When coming to a stop, the engine gets rough and the ABS light comes on. The brakes are good, though. What could be wrong? It's a 1989, but the year wasn't here, just 1990 or newer.
The cost to have the cold start valve replaced. Hard to start when cold and idles a little ruff.
Problems with starting. Replaced distributor cap, rotor button, spark wires, spark plugs and crank shaft sensor but still having starting problems and car running rough. Suggestions. Thanks
failed smog test; failed obd system checks-because light doesn't come with key, hc=282/max allowed=56 @25mph, co=1.62/max allowed=.39@25mph. already replaced the oxygen sensor and catalytic convert...