I have a 190e 1986 Mercedes Benz.

My problem is car will idle but the economy gauge will be sitting at 50%. I can barely touch the gas pedal and it will stall out.

This problem really varies, it started out as not being able to drive past 40 mph, as I test more the mph will get lower and lower.

I first guessed it may have been the fuel filter, bought a new one and the car drove normal for 1 day, then the speed went back down to 40mph then down to 2mph with the gas pedal pressed all the way to the floor.

Now it sits in the driveway and when I go to try to figure things out, sometimes I can press the gas pedal and it barley stays running or it will stall.

Help, I have not a clue on what to check on this car

I would start by looking for possible vacuum leaks, such as broken vacuum lines or ICV hoses (do a search). That "economy" gauge is actually a glorified vacuum gauge, and it sounds like you're only getting about half the vacuum you need. The gauge should only hit 50% when you are in mid-throttle or cruising. Too much air = too lean and won't run properly. Just my 2 cents, there are a hundred other things you could check on. Do a search.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

Ok, I will look into the hoses ASAP, little late for me to do it now.

Also disconnect the O2 sensor cable, (green wire) in the passenger footwell, (if it's the same as a 124) under the carpet and pad, and see if the problem persists. It's easy enough to check and can cause those symptoms.

P.S. Which engine does your 190E have?

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-Marty

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/831799-post13.html
http://www.peachparts.com/shopforum/831807-post14.html

@ A264172
I went and tired it, nothing changed.

1986 190E 2.3 4cy.

@ gmercoleza

I'm not sure where to look for the vacuum lines or ICV hoses, but I will do a search to help me locate and will working on that tomorrow.


Are there any other Idea's