190 D 2.5 1987.
Since I got the car in feb. 2004 I have driven 12.000 kilometers and changed
oil 4 times and added fuel additive to clean injectors such as Redex diesel
Does the car now use more fuel or is it the same or does it even use less?
Is the fuel intake controlled somehow i.e. it only intakes so much no matter
how clean/dirty it is (injectors)?
The car is much more responsive since my first ride in it.
Thank you. I will do just that on my next fill up and press the
miles-counter and fill up once nearly emty and do the math - which I also
did shortly after my purchase of this mb. I had 15 km/l before and my guess
is now 17-18 km/l. I just wondered and asked because maybe there was someone
who knew how the engine consumed fuel when injctors are stuffed with carbon
or clean top notch clean.
The injectors are designed to put out an optimum spray pattern
that will result in the efficient burning of fuel.
If the spray pattern changes due to wear in the mechanical parts
of the injector, the fuel will burn less efficiently, so you will start
using more right foot than you should to get the desired effect.
Additives in the fuel, such as the Red-ex diesel additive you speak
of, will only dissipate carbon build-up but will do nothing to cure
mechanical wear. If you suspect that your injectors are not doing
what they should, then lift them out and take them to a specialist
injection shop, where they will be brought back to new and re-
calibrated. While they are out, and before you get them fixed, get
the cylinders compression-tested.
An indication that the injectors are not performing as they should
will normally show in the exhaust output. If there is black smoke
in your rear-view mirror when you are flooring it, then there is
Take the injectors out and get the cylinders compression-tested.
If the compression in the cylinders is up to scratch then the problem
is more than probably the injectors. If the compression test gives
very low readings, then your engine is buggered, and you may
as well forget about the injectors, as you are looking at a replacement
engine or a re-build.
No black smoke from the exhaust.
After treetment with redex and oilchanges I can now go in 4. gear (aut.)
uphill places where it would shift down to 3. So the carbon-dirt seems to
have gone. It is probably due to the fact that the engine has hight torqe
now and runs alot better.
An engine like this 190 D 2.5 should easyly run without beeing buggered for
a very long time. When I had the topgasket off there was no noticeable ware
and the crankshaft looked fine as well as the valvelifters. The injectors
did look dirty but since the topgasket was broken and oil from cylinder 1
was pouring into the coolant it surely made a vast inpact. New gasket is now
fitted and engine has a change now to work and burnout carbon.
I belive buying a secondhand car is ok but one never knows what the others
guys having did or did not do.
Listening to the car nok since my first drive in it is very different. Noise
is much less. As I mentioned to the previous owner: "It sounds a bit like an
old tractor". He smiled. Now it sounds much more like a Mercedes and I can
barely hear the engine run and only hear the tires as I believe a mb should
So my advise is that a good cleanout of the engine with lots of oilchanges
and additives to clean out the carbon and some hight revs. burst are worth
A diesel engine is suppose to run for hours and hours and that is why I
purchased this mb. I would not have gotten a diesel if I was not travelling
many kilometers this summer down through Europe.
Running this mb 190 D 2.5 at 110-130 km/h down he highway makes the engine
sound like that is the speed (torqe) it likes.
On Sun, 23 May 2004 20:55:10 +0200, "Niels Ulrik Reinwald dgdf"
You could do far worse than getting it put onto an exhaust gas
analyser and having it set up so you know that it is fueling as best
as it can. The injector cleaner is a good move, as it is about
getting your car to run as efficiently as it can. Obviously clean
injectors sporting an even spray cone is the thing you want here.
I think you are getting slightly mixed up with regards to fuel
efficiency and fuel consumption.
1994 Mercedes E280 [W124] 99,000 miles (R.I.P)
1992 Mercedes 300 SE [W126] 230,000 miles
Ok, I see.
I also just made an adjustment to the fuel pedal linkage making the aut.
shift much more smoothly and the sound I heard before seems to have gone. A
slight "thu thu thu..." sound. Maybe the gear-ration is better now with the
fuel-linkage. It feels more like a mb aut. shift now. Smooth.
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