Number 2 issue sounds like loping at idle. Both are fuel
delivery/timing issues. Gump had them, but I can not remember what I
did.
this is from the 2000 digest
------------------------------
Date: Wed, 22 Mar 2000 15:48:28 -0500
From: Steve MacSween <[EMAIL PROTECTED]>
Subject: Re: [DIESEL] Loping idle on 300D
Larry Henderson wrote:
>
> Hey all,
>
> My '83 300D turbo diesel lopes at idle. It only does
> this when in drive or when the a/c is on (or both). I
> have loosened my injectors (to bleed air with the
> engine running) and tried adjusting the screw on the
> back of the injection pumper (right next to the piping
> hot oil filter; pointing at the oil filter 14mm lock
> screw and 12 mm adjusting screw). This did not seem
> to make a whole lot of difference.
From disucssions on the Mercedes lists over the last couple of years, I
have gleaned the following:
1. The five-cylinder turbodiesels have a tendency to do this.
2. Some people manage to fix it by playing with the rack damper bolt
and/or upgrading to the one with the stronger spring.
3. Others (like me) do #2 once in a while, and live with it otherwise.
However, most people who talk about it say it's the reverse of your
situation: their cars do it idling in park but are okay in gear.
Have you checked your motor mounts? If one is shot, then when you put
the car in gear the engine may be torquing around a bit, and pulling on
the throttle linkage, which could cause similar behaviour.
Just a theory.
If the infamour rack damper bolt upgrade/adjustment fix does not work,
and the mounts are okay, then evidence seems to point to the injection
pump governor. This is not really fantastic news, so we don't like to go
there ;-(.
Regards,
steve
-------
Sexton says My opinion: it's a vacuum leak. Mine doesn't do this.
------
The updated damper screw will probably help to get most if not all of it
out. My 300SD did this and the bulk of it went away when I replaced the
damper screw with the updated version. Now it only seems to want to do
it
under high temperatures, and inconsistently at that. . .
Dan Penoff
-----
to which Sexton replies
Loping: increasing then decresing the idele speen in a rhythmic pattern
with a frequesnty of .1 to .25 cps.
Thats what I call loping anyway. This is what McSweens car does.
The rack damper bolt is to smooth out vibration at idle and
you a) get the new longer bolt and b) only do this once your
car is tuned to *perfection* or else it's wasted time.
------
Bill Jones adds
Have you checked the condition of your primer pump? This little item
caused havoc in Mike's 300TD. Loss of power and air in the in-line
fuel filter.
Thanks to Marshall and Dan, we corrected the problem. It is a very
simple and inexpensive cure. The primer pump can be easily replaced
with a crowfoot wrench.
Regards,
Bill
--------------------
I think Gump had a fuel quality and temperature issue that made the
stuff too thick to flow well, so the IP was not able to properly feed
and would oscillate slow/fast trying to get it right. Also would start
and run to the end of the block, then quit when I brake. Not warm
enough? The block heater made it all go away
On Tuesday, November 15, 2005, at 07:31 PM, Christopher McCann wrote:
Two problems with the SD re: idle:
1. When engine is cold (not ambient brrrrrr cold, just room temp, but
worse when truly COLD) it idles fine BUT as soon as I put it in
reverse (or turn on the A/C in hot weather), the idle drops and the
car usually stalls. Will stall at about 450 RPM.
2. Let's say we start the car and no reverse or A/C is needed, the
idle is fine...we drive 1-3 miles. Come to a stop and the idle is
PULSATING between, say, 550-700 or so...just revving between those two
engine speeds, rhytmiically, on its own. I would say 1 complete rev
cycle per 1.5 seconds.
3. Drive it a bit more, get the engine hot and the rhythmic idle goes
away as does the reverse stall problem.
Took to my Indy today. He said, "Adjust Idle". OK. It was cold
(engine and 0 degrees C out), car starts, put in reverse, get halwayt
out of the parking spot - STALL. Drive a few miles to my friend's
house, park it and lo and behold, the rythmic idle rec described > above.
Obviously something other than idle adjust needs done. Is there some
GIZMO that controls idle when a load is put on (A/C, reverse (no
acceleration in reverse, just reverse and idle backwards (down hill -
still stalls!))) and/or would also cause the rhythmic idling?
Please help! Have had idle adjusted twice (with no effect) and I have
no idea what the problem is. Would like to get some list opinions to
take with me when I go back to my Indy tomorrow.
Thanks a million,
Chris
Christopher McCann, Squier Park, Kansas City, Missouri
-2005 Blue Point Siamese, "Rose"
-1987 300TD, 150K, "Rotkäppchen"
-1985 300SD, 209K, "Wulf"
-1976 240D, ?K, "AKP-Wagen" (Alternativen Kraftstoffs Prüfenlastwagen)
-1972 Jacobsen 21" Turbo Vent
-1971 Case 222 Hydrive, 12HP Kohler, 38" deck, Snowcaster, "One Banger"
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Clay
Seattle Bioburner
1972 220D - Gump
1995 E300D - Cleo
1987 300SDL - POS - DOA
The FSM would drive a Diesel Benz
