BenzWorld Junior Member
Date registered: Aug 2012
Vehicle: 1966 200D
Location: Portland, OR
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Ok, could you guys help me diagnose this surging issue? I am assuming that Govert is likely correct, but I am not sure how to pinpoint the issue. Here is a list of symptoms. Any suggestions on what to check? Just so you know this is the first Diesel I have worked on. Itis a bit intimidating. Before this it has been all pre-1967 Volkswagens (which are like working on lawn mowers), so I don't know the names of many diesel specific components.
-Car idles unevenly, rhythmically loping. It does it more so than other Mercedes diesels I have listened to around town. The engine rocks back and fourth while idling. I took a video and can post it if that would be helpful.
-There is no smoke from the exhaust. There is a small puff of white smoke as soon as the car starts, but it goes away after just a second. From what I understand this is good.
-Car bucks a bit, or lunges in first gear. I have to rev the engine up while letting off of the clutch otherwise the car will buck pretty badly in time with the loping engine. It seems powerful enough, but again, I have only weak Volkswagens with with to compare it to.
-I ran the car to get it home on five year old fuel. I now realize this was a terrible idea.
Could it also be that I need to adjust the Rack Damper Bolt? Can I look for vacuum leaks on this car like I could on a gas engine, by spraying carb parts cleaner on the vacuum lines and listen for a change in the idle? Might my issue also just be a clogged injector?
Last edited by 1966200; 08-16-2012 at 10:32 PM.