89 300e, W124

So, short story long:

I removed my EHA and cracked it open to richen it a bit based on a post I read on here, to deal with some low power issues I had been having (stuttering/stumbling when giving more that a little fuel from a stop). After that, the car immediately started misfiring on Cyl #3 (even AFTER I adjusted the EHA back to the original settings). Swapped plug and wire, replaced EHA with a NEW unit, but the issue remained, so I assumed injector(s). Injectors have been replaced (by mechanic), but the problem persists; they said it was OVER fueling the cylinder (mechanic). Am I correct to assume the the fuel distributor is the next reasonable conclusion? I have a used one in hand, but the real question is this:

Has anyone ever had the experience of over-fueling on just one cylinder as a result of a FD heading south?

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1989 300E 144K

going threw the over fueling now with our 190E, first you have to find the posts that are on setting the value of the EHA that is the most important issue with that item, you cant just put one on and think it is ok. find those posts and set its electrical value first then move on from there. JNT

going threw the over fueling now with our 190E, first you have to find the posts that are on setting the value of the EHA that is the most important issue with that item, you cant just put one on and think it is ok. find those posts and set its electrical value first then move on from there. JNT also look toward the fuel pressure regulator, this is the one I am asking Doc about at this moment, have not gotten an answer yet. JNT

I did set the EHA to -.4bar using the pressure ports and a guage

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1989 300E 144K

when you have the EHA set at its best setting it will read -0.0 to +0.0 or -0.1 to + 0.1 the Idea is for it to have a very neutral setting.

I'm assuming you are referring to the milliamp method of setting mixture. The initial setting is what I'm talking about (lower chamber on fuel distributor being .4 bar less than that of the upper chamber). It's hard to get a current reading from the EHA when the car won't run...

Aside from that, I did get the car running (thanks to user:LorainFurniture for the part). The original fuel distributor was flooding out cylinder 3, which was fixed when I swapped it out (and setting an initial setting on the distributor: removed a fuel line from the dist., jumped fuel pump, adjusted mixture screw (starting all the way lean) until fuel welled up in the exposed port).

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1989 300E 144K

yes I was talking about setting it in milliamperes, sorry for the confusion. JNT

I would recommend flow testing the distributor via injector lines into water bottles to find out of its injectors or the distributor itself and by how much the variance is. MB calls for no greater than 10% difference.

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