The black stuff you describe sure sounds like algae. If the car sat in
warm weather, algae will grow. Was the inside of the IP that you could see
shiny or blackened? Black on the inside of any fuel passage, or the top of
your spin on fuel filter, indicates algae. I would get a good algicide for
Diesel and give it the shock treatment. Then keep giving the fuel a
regular treatment for several tanks. Drive it on some long highway trips,
and see if the problem clears as the algae clears. The Injection shops I
have talked to say most pumps that go bad are ruined by algae, unless, as
Marshall says, they were ruined by "mechanics."
I doubt your pump needs to be replaced. They seldom fail in under 500k
miles. 100k is just broken in. I never asked the mechanics of how algae
causes a pump to fail. I suspect the comment applies more to rotary pumps
than our inline pumps. These shops have stacks of rotary pumps, and a
few inline pumps. I suspect the problem created by algae is wear on the
plungers. In a rotary pump, there is only one plunger that operates 4, 6,
or 8 times as often as a plunger in an inline pump.
At 08:07 AM 5/10/2006, you wrote:
Dieselvolk,
Last fall I picked up an '85 190D 2.2 5spd that popped up at a local
dealer. 104k miles, full documentation. I've been gradually sorting
out the issues (mostly minor: hood strut was weak, antenna wouldn't
fully retract, LR window needed to be cleaned/lubed before it would move
up and down). One issue was that the cruise control did not work. I
found that a piece of the linkage was missing (cross piece from near top
of IP over to actuator), installed a new piece from Rusty, and voila!
Cruise was back in operation.
However, one problem is still kicking my butt. It had a somewhat rough
idle when I bought it, and that has only gotten worse. At idle, the
engine is shaking the car so badly that the hood vibrates and the front
seats vibrate. Engine seemed to be rather carboned up (lots and LOTS of
smoke first time I test drove it - used that against the salesman)
having only been driven 5k miles a year or less, largely around town.
When the engine is dead cold, idle is better because idle speed is
increased. When warm, if I hold the idle at 900 RPM or higher, it is
smooth. Sometimes the idle is REALLY rough, sometimes better, once or
twice it was much better after 8) below.
My actions thus far:
1) Drive it hard and fast.
2) Diesel Purge treatment, straight through system at full strength
3) Measure engine mount clearance - passed this test easily, so I left
the mounts alone.
4) Qt of brand new ATF added to a tank of fuel
5) Cracked each injection line one at a time, but there was no obvious
difference for any cylinder
6) Disconnected/plugged vacuum to EGR
7) Pulled all injectors and had them cleaned and pressure tested,
pressure reset (The shop that did this, Bosch certified, screwed it up
the first time. Three of four injectors leaked at joint in middle of
injector body, I had to pull them and return to shop for re-work)
8) Pulled delivery valves and replaced copper washers, springs, and
O-rings; used proper torqueing procedure from Technical Data Manual
(tighten to 30 Nm, release, tighten to 35 Nm, release, tighten to 35Nm).
Now, I'd taken all the admonitions about clean-clean-clean to heart, so
I sprayed off top of IP with brake cleaner, then blew it off with
compressed air prior to removing anything. Nevertheless, when I pulled
out each delivery valve assembly, there was visible black specs of junk
inside each assembly and visible in the hole on the top of the IP. It
really seemed to me that all the fuel inside the pump was contaminated
with this junk. ** This fact has me concerned - could there be some
internal seal or rubber bit that is disintagrating and dumping junk
inside the IP? Is this mircrobial growth? Clear filter still seems to
be clean and free. **
9) Took the car on a long highway trip. I drove about 450 miles at 70+
miles per hour. After that, idle seemed to be even rougher.
I'm about to take it to my Indie, unless someone here has a bright idea.
Mileage is decent (33 mpg around town, I think I got about 35 on the
trip up). Car starts quickly, and does not smoke. Air and both fuel
filters are new.
Next thing I'm going to do is remove the piece of linkage for the CC. I
found it rather odd that this one piece was missing, and the system
worked fine once it was installed.
After that, I'm going to really think hard about replacing the injector
pump, and if that doesn't work, the motor mounts even though they are
not collapsed. I'll probably also look at the engine stop adjustment.
I've never played with one of those before, not sure if maladjustment or
aging of those pieces would cause a rough idle.
Thanks in advance for any ideas.
Very respectfully,
/s/
Meade Dillon
Charleston SC
'87 300TD 287k miles
'85 190D 2.2 5 spd 106k miles
'85 300TD Euro 5spd 327k miles *sold*
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