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Old 12-11-2003, 10:38 AM
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Question 1971 modell 350 SL Electronic injection

I have a 350 SL 1971 with electronic injection.
The engine vill not start. The spark plugs are very wet of gasoline so it vill not ignite. If I block the fuel hose from the fuel pump with a vice grip. Take the spark plugs out and run the engines so the gas blow out of the sylinders. Innstal dry sparkplugs.
The engines start and goes in 2 -3 second . If I open the vicegrip, and try to start again, it will not start. Spark plugs are wet. Someone know from experience what's wrong ?
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Old 12-11-2003, 12:38 PM
it leaks, its german
Join Date: Mar 2002
Location: raleigh nc
Posts: 1,111
whats the fuel pressure?

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Old 12-11-2003, 01:13 PM
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Hi Joe
I dont now. Where and how did i measure the fuel pressure?
Regards Arvid
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Old 12-11-2003, 02:33 PM
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Join Date: Jun 2000
Location: SF Bay Area
Posts: 18,745
That used to happen to my dad's 300SEL 3.5 on very high humidity or rainy days. A few minutes with a hair drier on the ECU fixed it. A new rubber cap on the ECU was a more permanent fix.

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Old 12-11-2003, 04:48 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Either the injectors are staying open much too long or you have a plugged fuel return or bad pressure regulator causing very high fuel pressure.

Also, check to make sure the temp sensor in the air horn is connected properly -- if the wires are bad, the ECU "thinks" it's about -60 degrees and will dump huge amounts of fuel down the intake.

You could also have a bad cold start valve or thermo-time switch.

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1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
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Old 12-27-2003, 12:25 PM
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My mecanic have found the problem.
The fuel electronic control unit put out a injection valve time 140ms. Normal time are 4 ms. I need a new control unit
Have a happy new year
From Norway
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Old 12-27-2003, 12:33 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Ya, that sure will do it.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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