Question about 1991 Mercedes-Benz 190

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Engine warms up and idles at 2000RPM


My 190E is hard to start and when it does it idles low then warms and idles at 2000RPM and will not kick down

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If you checked as suggested for vaccum leaks and have no improvement or only little... Assuming here its KE-Jetronics fuel injection.... on the excellerator linkage is a microswitch that gets activated when the excellerator hits idle position (decel fuel shutoff)... it has an influence on your idle quality, also the electronic component in your air/fuel mixture body (Airflow potentiometer) could be the 'guilty' party aswell as your Idle valve (on single belt engines) that is stuck between the inlet pipe of number 3 and number 4.Engine warms up and idles at 2000RPM - 12001b5.jpg Anyway i hope this helps to locate the problem

Posted on Aug 18, 2008

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Hi the bad starting is most probably caused by the big breather pipe under the inlet manifold towards the rear it's about 25 mmdia but hard to find if is a bad fit it alows air to be drawn in and will cause bad starting if it comes off .as mine did engine will not start at all when you put it back put a cable tie on it chris

Posted on Jul 11, 2008

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Sounds serious if all those people were not able to solve the problem after having the car for six weeks and getting toyota tech support involved.
Since there are no trouble codes and all those parts were tried I'm a little bit stumped here also, almost all engine malfunctions will trigger a trouble code to turn the check engine light on.
Can you tell me a little history, did you buy the car new, how long ago did this start, was the car in an accident, what recent repair attempts were made to correct this problem, if any other than swapping the components?
There is one other possibility that will not trigger a check engine light and that is that the fuel may be contaminated, have the fuel drained and put in fresh fuel in the tank to see if it solves the problem, any input you may have may help me to solve this.

Posted on Jul 02, 2008

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