1989 560SL stumbles when starting after a warm up - Mercedes-Benz Forum
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post #1 of 12 (permalink) Old 05-17-2019, 08:39 PM Thread Starter
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Date registered: Aug 2018
Vehicle: 1989 560SL, 1986 190 2.3-16 Euro MT, 1990 300E 3.2AMG, 1991 300E 3.6 Oettinger, 1990 300GE
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1989 560SL stumbles when starting after a warm up

Hello everybody!
I am new to this forum.
I have a 1989 560SL white on red that I bought back it 2014 from Oklahoma, from the first owner.
The car has 32k miles and is in pristine condition.
Ever since I bough the car there has been a small issue. When the car sits over a long period of time it cranks just fine. When it is fully warm it cranks and runs just fine, very strong! Everything is perfect except this one thing. When the car is warm and I shut it off, and if I am to restart it within lets say 20 minutes, it cranks instantly, half a turn. But if it is to sit lets say for an hour or overnight, it cranks instantly but dies right away. Then with a second crank it cranks instantly and runs like nothing ever happened. All the maintenance is done including all possible flushes, new filters, sparks, wires etc. Non ethanol gas only with clean boost additive.
Ill be honest, I only put about 500 miles for these past 5 years on it. Just don't have time to drive it.
I took the car to the dealer and of course we could not replicate the issue but I also realized that they know nothing to very little about KE Jets.
I would highly appreciate any input on this matter.
Sincerely,
Tony.
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post #2 of 12 (permalink) Old 05-18-2019, 01:28 AM
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Good Morning Tony,

I had this issue, bad start up in warm condition after 20 minutes until 1 hour, with my 300 SL, 1986. After I changed the Fuel Accumulator everthing was fine. Now the car starts as it was cold. The Accumulator is quit expensive, more than 120 €

Best regards
Marcel
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post #3 of 12 (permalink) Old 05-18-2019, 09:14 AM Thread Starter
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Vehicle: 1989 560SL, 1986 190 2.3-16 Euro MT, 1990 300E 3.2AMG, 1991 300E 3.6 Oettinger, 1990 300GE
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Got it. Thank you!
Do you think it also might be leaky injectors and maybe a leaky return valve on the pump? I have heard that when accumulator goes bad the car has a real hard time starting and running.
How was yours starting and running when you had a bad accumulator, if you could please describe.
Thank you.
Tony.
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post #4 of 12 (permalink) Old 05-18-2019, 05:00 PM
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I'm not sure but what you are describing sounds like a cold start problem, which would not be accumulator related. If you couldn't start it within 20 min I would suspect BUT STILL TEST the accumulator.
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post #5 of 12 (permalink) Old 05-18-2019, 09:41 PM Thread Starter
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Vehicle: 1989 560SL, 1986 190 2.3-16 Euro MT, 1990 300E 3.2AMG, 1991 300E 3.6 Oettinger, 1990 300GE
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Hello.
It is hard to say, but if I am to restart an engine in less then 30 minutes on a full warm up, it fires right up. Even if the car sits for let's say over an hour the engine is still very warm but it stumbles on a start. Do you think cold start is activated on a still very warm engine?
Also overnight it does the same thing, this time on a completely cold engine. Let it sit for a week and it starts just fine, not with a first crank but a lets say two turns of a crankshaft.
I am rebuilding brake calipers on it now and will attack this issue lated this year. How do you test the accumulator?
Found this accumulator for very reasonable money. Should I just replace it considering original is 30yo?
Again, I have read that when accumulator goes bad the car has a real hard time starting, which is not the case. Mine just catches and dies, like it is a lack of fuel.

P.S. Assuming accumulator is bad, if I remove the rubber line from the back of it I should see fuel coming out?

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post #6 of 12 (permalink) Old 05-18-2019, 10:07 PM
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I have the same issue

This is very interesting thread, I have the same issue.

Engine cranks well but it needs second crank to start. This happens especially with warm engine. First cranking is pretty long but the engine does nor start. Second crank will fire the engine imediately.

My 560SL is 1986 and mileage is about 60t miles.

I am suspecting if the air plate or FD plunger home positions do not have correct settings.

Yka

"Done is better than perfect."

Last edited by yka; 05-18-2019 at 10:08 PM. Reason: Double sentence...
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post #7 of 12 (permalink) Old 05-18-2019, 10:24 PM Thread Starter
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Unmolested engine, I am the first to wrench on it.
I suspect either loss of pressure through leaky injectors or going back the fuel line via return valve or even accumulator.
Very possible might be something with cold start function.
Does your engine starts instantly if you are to restart it one a full warm up within 5-10 minutes?
I will get to the bottom of this )
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post #8 of 12 (permalink) Old 05-19-2019, 12:36 AM
yka
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My cold engine starts by first crank, needs several turns but starts.

If I have driven lately, when the engine is not totally cold - I have to crank it twice. At the second crank it starts imediately. To me KE injection is like somehow jammed at the first crank.

I have checked the fuel pressure, so the fuel pumps, filters, pressure valves and fuel pressure accu are ok. I have original type Bosch spark plugs, ignition wires, distributor and distributor cab are lately renewed.

This need of double crancking is very annyoing, especially if there are people around the car - waiting to hear the sound of engine.

Only thing I am not sure is the KE air plate and FD plunger home positions.

Yka

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post #9 of 12 (permalink) Old 05-19-2019, 12:42 AM
yka
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Unmolest engine :

My engine was unmolested. I had to renew all rubber parts like injector seal, holders, air tubes, air pump hoses and vacuum rubber tubes. These all plastics and rubbers were very hardened and brittle.
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Yka

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Last edited by yka; 05-19-2019 at 12:43 AM. Reason: Typo mistake
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post #10 of 12 (permalink) Old 05-19-2019, 06:54 AM Thread Starter
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yka, have you checked fuel pressure on the initial start cold, running and warm continuously by any chance to see if it drops when it sits?
What do you think about injectors? It is very possible one or two might be leaking down and hence slowly reducing starting pressure?
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