Thanks Guys! I worked on it more yesterday and after reducing the
torque slightly on #1,2 and 3 I checked the engine and it still ran
poorly. I then cracked the fuel lines at the injectors to see what
happened - 1,2,3 & 5 all showed significant reduction in idle quality.
These 4 cylinders seem to drop the engine from ~4 cylinders to 3!. The
obvious exception is cylinder #4. When I cracked cyl #4 there was
virtually no difference in the idle speed or quality. I'm not sure why
I said #3 was the weak one before - but like Max said, this indicates a
problem with this cylinder - either from the pump to the injector and
everything in between.
I'm going to look at it more today...
Thanks for all the input!
Larry
On 01/27/2017 2:48 PM, Meade Dillon via Mercedes wrote:
I was also just thinking that the problem could be either the DV or the
injection pump itself. Moving the DV around would help diagnose that.
-------------
Max
Charleston SC
On Fri, Jan 27, 2017 at 2:38 PM, Curt Raymond <curtlud...@yahoo.com> wrote:
+1 for this.
The other thing is to listen for the quality of idle, does idle quality
change when you loosen the injector? If it doesn't for #3 thats also an
indicator that its a problem.
-Curt
------------------------------
*From:* Meade Dillon via Mercedes <mercedes@okiebenz.com>
*To:* Mercedes Discussion List <mercedes@okiebenz.com>
*Cc:* Meade Dillon <dillonm...@gmail.com>
*Sent:* Friday, January 27, 2017 2:13 PM
*Subject:* Re: [MBZ] My 124 is idling rough (91 300D 2.5Turbo)
Larry,
According to what you just wrote about the volume of fuel from #3 vs the
other injector lines, the delivery valve for #3 is suspect, not the
injector.
-------------
Max
Charleston SC
On Fri, Jan 27, 2017 at 2:07 PM, Larry Turner via Mercedes <
mercedes@okiebenz.com> wrote:
Thanks Curley. You're talking about removing the Injectors and that's
something I have never done (never needed to til now).
I have to decide how I want to proceed.
BTW, before I learned the fuel lines were self bleeding, I cracked a
couple of lines (maybe all of them) to see if I was getting fuel to the
Injectors. I noticed #3 acting different than the others. The others
squirted fuel from the threads (depending on how much I loosened the
injectors) . So so while #3 might be a good place to start I need to
repeat that process to confirm #3 has a weak stream of fuel.
Let's say I have #3 definitely acting suspiciously - producing a dribble
of fuel after loosening the nuts 1 or 2 full turns - which ever amount
produces a good flow of fuel from the others. If #3 is showing a
reduced
amount of fuel getting to the Injector, I assume I have 2 options :
having
the Injectors tuned up/serviced as indicated my Max, or replaced with a
rebuilt Injector? Are those my options?
I have to decide how to have the work performed - I may be forced to R&R
the Injectors myself and either install a new one or have this one tuned
up. If that happens I'll need to get a lot more info about what is
involved with R&R'ing the injectors. Plus I'll need to learn more
about
the special tools required. But we can address that later.
Larry
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