PeachParts Mercedes-Benz Forum - 1982 300 TD Warm start problem.

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1982 300TD Warm start problem.

My diesel starts first time when cold (immediately).
When hot it will start immediately if switched off and then back on right away.
If left for a few minutes it needs to be cranked over many many times before starting, usually I have to switch off at least twice between repeated cranking over of the engine (very frustrating).
I have also noticed since this problem started that the engine tends to run on a little after switch off (maybe my imagination).
I changed both fuel filters and the problem persists.
After the engine cools down for approx 30 minutes it will start immediatly again.
The station wagon has run for 250K miles and is still in nice shape, I love it except for this problem.
I would appreciate if anyone has any suggestion as to what the problem may be.
:confused:

TonyR,

This is not a sympton of plugged fuel filters as you found out.
Symptom of plugged filters is loss of power when engine is under a heavy load such as going up a steep hill
.
I would look it as a GP problem. Are the GP coming on when the hard start problem is present? Are you waiting long enough for the GP to heat? Don't rely on the dash GP light. It can be out of calibration like one of mine and cause you to try to start the engine too soon.

Try waiting about 30 seconds for the GP to heat and see what happens.

P E H

Tony R.,

Did things work out? This seems to be a common problem, actually, and if the issue could be nailed down a little bit with a definite series of steps to fix it, a lot of W123 Diesel owners would benefit. Jim

Quote:

Beagle:
I notice that your reply to my post has disapeared, did you delete it?
I thought that your solution sounded very feasible, I wanted to try it last night however here in Seattle it was raining.
I did take a quick peek under the hood and looked around the injector pump for the vacuum line you described, there are a few pipes but none appeared to have any coloring.
I will have to familiarize myself with the line connections going to the injector pump so I can locate the tube you describe

Tony
Pull off the vac pipe from the shut-off diaphragm (arrowed in the attached image), look for signs of oil and see if it will start immediately disconnected.
If so:
1) Turn ign. Switch on to # 2 position.
2) Use an aerosol can of penetrating fluid to blow thro the vac line to the switch and wash out the oil and then turn the can upside down to blow out the fluid. (You will need to remove the dash panel under steering column and wrap a rag around the switch to catch the mess – no need to pull the pipes off.) This is a common problem with these engines.

If no start we will need to look elsewhere:-). Let’s know how you get on.

Don't know what happenned to my original post, I edited it but must have deleted it accidently!!
Beagle