Nate (and others interested):
Sorry for the long post, but it has been a 3 year problem.
I have written about the goofy stalling problems I've had with my 1981
240D stick. Here's what I wrote on a mercedes forum 3 years ago:
Here we go again guys:
I hope I can do this without too lengthy an explanation because hunt and
peck is a terrible way to go.
My 1981 240D suddenly got squirrelly at idle a few days ago. It would
seemingly run fine at speed, but when slowing down to idle it seemed as
if it were running on 2 or 3 cylinders - really rough. Using the
throttle I could rev it a little and it would seemingly smooth out and
be OK - until last night. I think if I let it go long enough it would
have stalled. I looked at the engine and there was a lot of fuel all
over #1 injector. I tightened the nuts fastening the lines to the
injectors, hoping that loose fittings were leaking fuel. No change. I
suffered it for a few days until last night. It was pretty much running
the same way - badly at idle - until I drove into my brother's yard to
show him the situation. It was idling really badly. Finally it
stalled. I got it started and stumbled 700 feet to my place across the
road. It stalled as I slowed to pull into my driveway. I couldn't get
it started and keep it running to pull into the driveway, so I left it
at the end of the driveway for the night.
Do I have 2 problems? It seems as if the fuel return lines are wet and
maybe seeping. It appeared that the fuel on #1 injector was above the
terminal where the return line fit on and above the nut boss for
disassembling the injector, which is why I initially suspected a leaking
line nut. Can severely leaking return lines cause the problem I'm
having? I think not, but certainly don't know.
It seemed as if the problem got worse as the engine warmed up. It
pretty much started normally - it's moderately cold - and ran OK for a
little bit. 3 miles into town for the first stop at a light and the
idle was bad.
I'm somewhat baffled with no direct experience with this condition. Of
course I suspect fuel. But, because full power operation seems
somewhere near normal, I'm mentally eliminating the usual suspects like,
filters plugged. I just went out to try to start it and move it into
the driveway. It took a couple of trys after it having stalled last
night (fuel starvation?) and then it started and I drove it into the
driveway. It seemed normal. I had it on high idle with the manual cold
idle adjust. It's about 40 this morning. When I lowered the idle with
the manual adjust it was idling normally.
I inadvertently pulled the return line at the first injector, the one
that returns to the filter, because it came off so easily. Clearly,
that explains the leakage around that fitting. However, I expected fuel
to spurt out of the fitting on the injector. It did not. I'd say it
sputtered out. It was not anything like a stream.
Anyone have a clue about what might be going on here.
Roland Hyatt
Then I recently posted this:
3 years ago I posted the below missive - or should I say, "massive" -
about an intermittent stalling problem. Well, it's now been 2 weeks
since I think I found and fixed the problem, because there hasn't been a
recurrence since. It has plagued me off and on for 3 years. Even to
the point that I didn't use the car much - it was too unreliable. It
would always restart when it stalled, but what a hassle. I had a
thought, as always and as others had suggested along the way, that it
sure seemed like fuel starvation. Lately I have been chasing a vacuum
issue that I suspected may be activating the shutoff on the pump. Wrong!
One day, as it happens, I was daydreaming about the problem and
solutions. Eureka! The fuel primer pump. I had never looked at it
because it wasn't leaking. But frustration is the mother of invention.
I jumped over and worked it - it was the old style - thinking that I
might realign an O ring. As soon as I pumped, it leaked like a sieve.
I had one of the new style and 10 minutes later it was replaced. It
hasn't stalled since.
Here's the irony..... This morning I was looking in the archives to find
my original post. Along the way I found one in 2006 from Christopher in
reply to a question about stalling from Barry:
" Is there a fuel leak as well? I am wondering if the primer pump is
leaking air... " Duh!
So, another for the archives. While mine was not leaking fuel, it was
obviously sucking air from time to time.
Onward and upward - only 3 years to solve the problem.
Roland Hyatt
So, Nate, it appears the problem is solved as it has been over 2 weeks
of near daily, cold weather driving, without a stall. It was fuel all
right. My experience may help someone else.
Happy New Year!
Roland Hyatt
with a bunch of klatta klatta Mercedes in Fallon, Nevada
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