1983 240D rough idle/stalling at light when warm - PeachParts Mercedes-Benz Forum

trout007 · #1 10-13-2015, 06:06 PM

The car starts and runs fine. Then after it warms up when I get to a light the idle is rough and will stall if I don't shift into neutral and keep the idle up. Then when I start driving again the power is really low but eventually gets better.

Any ideas where to start? From what I've read it sounds like it may be fuel lines/filters/manual pump leaks. Just though I'd ask before I started digging around in case anyone had any ideas.

barry12345 · #2 10-13-2015, 07:58 PM

Valve clearances should be checked. Especially if you have no ideal when last done. Maintenance requirement every 15K to check them.

May not be it but a place to start.

trout007 · #3 10-15-2015, 11:48 PM

It was a clogged filter. Big piece of whale snot. Seems fine now.

dieselgirl85300D · #4 10-16-2015, 10:05 AM

Have you flushed/cleaned your fuel tank?
May help some of the whale snot issues

trout007 · #5 10-16-2015, 11:53 AM

Quote:

Originally Posted by dieselgirl85300D

Have you flushed/cleaned your fuel tank?
May help some of the whale snot issues

PO claims to have done it and I tend to agree since it ran fine up until then. Might be some bad fuel.

I was planning on replacing the sending unit this winter so I'll take a look then.

barry12345 · #6 10-16-2015, 11:59 AM

We occasionally forget almost always fuel filters first on any suspected running problem. They can enable so many issues .

I did this time.

trout007 · #7 10-16-2015, 03:47 PM

Quote:

Originally Posted by barry12345

We occasionally forget almost always fuel filters first on any suspected running problem. They can enable so many issues .

I did this time.

Yeah I'm new to this whole thing. Why do you think it only happened after driving 30 minutes or so? Just bad luck?

barry12345 · #8 10-17-2015, 10:31 AM

Quote:

Originally Posted by trout007

Yeah I'm new to this whole thing. Why do you think it only happened after driving 30 minutes or so? Just bad luck?

Filter problems can follow no logical reasons sometimes. Normally for example that the car went much better after raised well above idle is interesting. One would have though the fuel flow would have been even more restricted.

I am a believer since most 240d owners want or need all the available power they can deliver. A general fuel system checkup is a good ideal. If no issues are found great.

If issues are found they are easy and cheap to rectify usually. These cars can run with a fuel system in a very substandard condition. They usually run at least somewhat better and are more reliable if maintained. When maintaining them you get to know and understand them better. Then if a problem comes up you can find it easier.

trout007 · #9 10-17-2015, 01:12 PM

Quote:

Originally Posted by barry12345

Filter problems can follow no logical reasons sometimes. Normally for example that the car went much better after raised well above idle is interesting. One would have though the fuel flow would have been even more restricted.

I am a believer since most 240d owners want or need all the available power they can deliver. A general fuel system checkup is a good ideal. If no issues are found great.

If issues are found they are easy and cheap to rectify usually. These cars can run with a fuel system in a very substandard condition. They usually run at least somewhat better and are more reliable if maintained. When maintaining them you get to know and understand them better. Then if a problem comes up you can find it easier.

Do most owners just keep those little plastic filters in the trunk with a screwdriver in case this happens or go with a larger filter that is easier to keep clean?

barry12345 · #10 10-17-2015, 01:40 PM

A good ideal to carry both and the few tools required to change them in the trunk. You never know when you can pick up a dirty load of fuel on a trip.

A seriously obstructed filter on a trip has happened to many diesel owners. I do not know about now but in the old days we always carried spare fuel filters for our diesels. It is not a waste of money simply because you will need or want one in the future anyways.

A spare fan belt is also a good ideal. Or put on a new one if the present one is worn and keep the old one for an emergency spare. Also carry the replacement filter in a fuel proof container. Keeps and dirt out and provides a place to keep the filter or filters you changed out on suspicion as an emergency spare if it proves not to be the issue.