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-   -   Weird Idling=stall? (http://www.peachparts.com/shopforum/diesel-discussion/222703-weird-idling%3Dstall.html)

cspeel 05-19-2008 01:26 PM

Weird Idling=stall?
 
I own a 10981 300TD turbodiesel...

My car wouldn't start for a couple months after what turned out to be a simple fix(I guess the "lift pump" became disengaged and had to be tightened and the fuel lines purged of air). Needless to say, Iam nowhere near a mechanic and I am trying to learn!

It was running better than ever since I had just replaced the glow plugs prior to the above incident.

The other day I started it, noticed it was idling roughly and kind of "gasping", then when I backed it out of the garage, it died. I started it again, same scenario. Started it again, gave it some gas for a few seconds and it did not die this time but continued to idle roughly, I did not drive it to work. Later in the day after work, I tried starting it again, this time it did not seem to be idling too roughly but I did not drive it around the block to make sure.

I am a little concerned... Does this sound like a problem to any of you more experienced folks? Thanks for any suggestions or help you could give me!!!

ForcedInduction 05-19-2008 02:03 PM

Sudden rough starting/running is usually just one or more bad glowplugs. Does a 10,981 300TD even use glowplugs? :P

Read through these guides and search the forum for "glow plugs" and you'll find what you need.
http://www.pauldrayton.com/uploadfiles/merc/Service/W123/Index/617T/15EngineElec.html

If you let it sit and idle does it smooth out after 30 seconds or so?

cspeel 05-19-2008 02:19 PM

I just replaced the glow plugs a couple of months ago, could it be that they are already bad?

It seems like it would drive fine, no weird sounds or anything, when i put the gas on... just when I started it and let it idle for a while. It was not idling for over 2 minutes, but it did seem to settle down after awhile. Later in the day when I started it again, it seemed to idle fine.

cspeel 05-22-2008 05:21 PM

ok.... well i went to start it this morning... it started... idled a couple seconds and slowly and roughly rumbled to death. I repeated this 3 times... trying to get life into it... Then the crazy thought occurred to me that maybe my gas gauge is not functioning correctly and I was out of fuel? I have never run out of fuel in my life and I don't really know the symptoms... does this sound like a fuel issue??? the gas gauge says that i have a little less than a quarter tank.

rrgrassi 05-22-2008 05:56 PM

A worn out rack dampener can give the same symptoms.

How does it perform when fully warmed up?

cspeel 05-22-2008 06:09 PM

usually the car runs very nicely when warm... it doesnt idle rough at all... its a nice ride...

however, i cant get it to idle more than 20 seconds right now... it just cuts out. it will restart though... and dies again after a few seconds...

Skippy 05-22-2008 10:08 PM

Fuel system sucking air somewhere?

rrgrassi 05-23-2008 09:56 AM

What Glowplugs did you use? Only use Bosch or Beru. The rest have a life of a few days to a few months.

Also, when were the filters last replaced?

Magoo 05-23-2008 10:19 AM

Have you taken it around the block since this idling issue started?
Mine will idle rough and sometimes stall when the primary fuel filter is starting to get plugged. When this is happening I can usually rev the engine and it sounds OK, but it won't want to idle.
If it is the filter, it won't have the normal amount of power when driven. Take it for a short spin around the block.

vstech 05-23-2008 10:39 AM

Quote:

Originally Posted by cspeel (Post 1859386)
I own a 10981 300TD turbodiesel...

it's nice to know that MB is still making Diesels that far in the future... I hope you find the problem.

cspeel 05-23-2008 12:09 PM

Quote:

Originally Posted by rrgrassi (Post 1863696)
What Glowplugs did you use? Only use Bosch or Beru. The rest have a life of a few days to a few months.

Also, when were the filters last replaced?

i have bosch in there right now

i am not sure when the filters were last changed, not since i have owned the car which is a bit over a year. i have only driven the car about 4000 miles since then.

cspeel 05-23-2008 12:11 PM

Quote:

Originally Posted by vstech (Post 1863743)
it's nice to know that MB is still making Diesels that far in the future... I hope you find the problem.

yeah its comforting to know that mercedes made it out of the recession and the oil crisis...:rolleyes:

cspeel 05-23-2008 12:15 PM

Quote:

Originally Posted by Magoo (Post 1863713)
Have you taken it around the block since this idling issue started?
Mine will idle rough and sometimes stall when the primary fuel filter is starting to get plugged. When this is happening I can usually rev the engine and it sounds OK, but it won't want to idle.
If it is the filter, it won't have the normal amount of power when driven. Take it for a short spin around the block.

i literally cant get it in gear fast enough to rev the engine up... let alone drive it aroud the block:confused:

there was air getting into the fuel system recently, the lift pump(or whatever its called) was open and letting air in. an acquaintance of mine who is a diesel mechanic(but not a mbz diesel mech.) said that i would have to replace the lift pump in the next couple years because it didnt look very good.

Burnzy 05-23-2008 12:18 PM

When were the valves last adjusted?

cspeel 05-23-2008 12:43 PM

Quote:

Originally Posted by Burnzy (Post 1863856)
When were the valves last adjusted?

No idea! there are no service records...


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