Adjusting EHA? 1990 300e 2.6 doesn't appear to have adjustment feature... - Mercedes-Benz Forum
 
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#1 (permalink) Old 07-10-2007, 08:02 AM
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Adjusting EHA? 1990 300e 2.6 doesn't appear to have adjustment feature...

Reading about adjustment of eha but on my car I don't really see any type of adjustment feature. Again, this is the black box mounted on to the back side of the Fuel distributer correct? I can find a plug in but no adjustment screw anywhere.
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#2 (permalink) Old 07-10-2007, 08:19 AM
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if you removed the EHA you will be able to see a gold screw. this gold screw is only a cover for the adjustment. remove this screw.

adjust only by 1/8 clockwise


with regards to your idle problem, clean and wipe the throttle plate and housing with a carb cleaner

and also change your fuel filter and will change fuel accumulator as well

have the same problem as yours
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#3 (permalink) Old 07-10-2007, 08:35 AM
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Did the adjustment of EHA have an effect for you? I have just in last couple days, cleaned out plate and whatever i could reach inside the throttle body plus shot carb cleaner through throttle body while running, replaced fuel filter. Where do I find the accumulator?
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#4 (permalink) Old 07-11-2007, 09:45 AM
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accumulator beside fuel filter (faulty accumulator can cause low idle)

EHA adjustment will give you more aggressive/responsive acceleration and will correct sluggishness but dont go beyond 1/8 turn coz it will have hard starting.

another way to gain a similar result without adjusting the EHA is by putting a 50k ohms variable resistor or potentiometer in series to the green-violet wire of the engine coolant sensor fooling the computer to think that your engine is colder and it will make it run a little richer (ECU control on EHA via engine temp sensor)


i have this set-up and is very happy with it.
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