Did you at least test the fuel/air mixture before you go out and buy a new one?

__________________

1990 190E 3.0L

If you're referring to the duty cycle, no I did not change it. I would need to get the car up to temp and rev at 2500 rpm to properly adjust it. At least that's what I've read. I don't want to run the car the way it is. My shop owner neighbor swears she runs just fine when not stumbling and that the FD just needs to be rebuilt. The diaphragm in the FD may have gone bad.

__________________
sjsfiji

'87 W124 260E (DD)
98K orig. mi. @7/15
CLK 7-Spoke Forged Wheels
Neuspeed springs/Bilstein Sport
4/3 bump (F/R)

'97 993 Carrera
106K orig. mi.
Always driven like it's stolen

Again, these are all just theories and guesses from your neighbor, but hopefully the rebuild fixes the problem. If not, you will eventually need to start systematically testing the components instead of replacing everything under the hood. I've been through the same exact thing a few months back and replaced almost everything fuel related and ignition related... http://www.peachparts.com/shopforum/3458741-post7.html
Good luck and keep us posted.

__________________

1990 190E 3.0L

Yeah, i hope that fixes it too. At first I assumed the problem was electrical [e.g. spark] so I did the normal tune-up wear items (plugs, wires, cap & rotor). Then we, neighbor and I, realized or at least assumed the problem is intermittent fuel starvation at only certain cylinders, so the plan of attack was fuel filter (wear item), injectors (still had orig steel), then FD. That is where I am at right now and I hope that's the end.

__________________
sjsfiji

'87 W124 260E (DD)
98K orig. mi. @7/15
CLK 7-Spoke Forged Wheels
Neuspeed springs/Bilstein Sport
4/3 bump (F/R)

'97 993 Carrera
106K orig. mi.
Always driven like it's stolen

Any updates ??

__________________
1985 300D 198K sold
1982 300D 202K
1989 300E 125K
1992 940T

"If you dont have time to do it safely, you dont have time to do it"

"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not."

Try this it wont cost a dime ,Remove the hose going to the brake srvo block off the end with a bung ,so no vacumm can get out or air in .Try it now ..I go along with not messing with the mixture this is something simple. The fuel pressure regulator can get blocked up with dirt and rust this is in the same area as the fuel filter... Take a fuel pressure reading also .Do come back and let us know ,easy things first .

In case it matter, the temp in the garage when I last started her up was about 48F.

__________________
sjsfiji

'87 W124 260E (DD)
98K orig. mi. @7/15
CLK 7-Spoke Forged Wheels
Neuspeed springs/Bilstein Sport
4/3 bump (F/R)

'97 993 Carrera
106K orig. mi.
Always driven like it's stolen

Going thru quite similar with my 89 300E.
Read a volume of material on the issue, about War and Peace for volume.

The high idle seems to be locked into the IAC. I replaced my IAC with a
gate valve which seems to have eliminated my surging idle but left me with
an idle of about 1K.

Not new to working on cars as I go back to '51 Packard straight 8. Have to say this CIS MB is one of the worst pieces of sheeeet I have ever worked on.

On the positive, once I get this POS running correctly again, its is the last MB I will be working on. Done, done done !!

__________________
1985 300D 198K sold
1982 300D 202K
1989 300E 125K
1992 940T

"If you dont have time to do it safely, you dont have time to do it"

"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not."