I loosened the injector lines one at a time and the #4 hardly affected the operation of the engine. The other 3 almost killed the engine when I loosened them. Hence #4 is not producing. Then I swapped injectors #2 and #4 to eliminate or identify the injector as a possibility. Problem stayed with #4. Then a compression test revealed 350, 340, 350, 340 so I could eliminate the engine proper. The problem was in the #4 part of the engine.
That leaves the injection pump.
I suppose its possible that there is a clog in the #4 intake/exhaust that only shows up when it's going faster than compression test cranking speeds. But I'm not going to check that next. Tomorrow I am going to take the lines off and reattach them away from the engine and screw the injectors on them. They will be spraying into the air. But I may be able to see a difference on the #4 line that will verify the pump is not delivering properly to #4. If that fails to reveal anything then I will check the manifolds for blockage next.
After that I will take the top off the IP to see if something is happening during #4 injection window that only happens during the #4 injection window. If the controller section is doing something odd I can put the control section from a 5 cyl pump on it. Otherwise I will need a known good used pump.
TMI?
Bogy.
"Hardware eventually fails. Software eventually works" - Michael Hartung
From: "vwnate1@yahoo.com [diesel_mercedes]" <diesel_mercedes@yahoogroups.com>
To: diesel_mercedes@yahoogroups.com
Sent: Friday, July 29, 2016 9:44 AM
Subject: [diesel_mercedes] Loping OM161
7.29
Good morning Bogy ;
I too am struggling with a loping issue , how did you diagnose the specific cylinder ? .
-Nate
Bogy wrote :
At least I think it does. It still has a lope and it is still the #4 hole. But with very even compression and injector swapping not moving the problem, I have no choice but to look at the pump. So does anyone here have a known good working injection pump for a 1980 240D for sale.
Bogy
"Hardware eventually fails. Software eventually works" - Michael Hartung
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Posted by: Bogy Wan Kenobi <polespearbogy@yahoo.com>
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