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  #1  
Old 08-21-2007, 07:50 PM
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85 380SL stall

first time car is started for the day there is no power on takeoff. the car runs fine but will hessate on takeoff for the first few minutes.
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  #2  
Old 08-21-2007, 09:49 PM
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Almost certainly a warm-up regulator problem. Do you know how to check control pressure?
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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  #3  
Old 08-22-2007, 10:57 AM
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no I do not know how to check the regulator control pressure. thank you for any help you can give me. this has been going on for some time .
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  #4  
Old 08-22-2007, 01:55 PM
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This can be a really good chance to learn, but it is not a good area to charge into without some knowledge of your K-Jet system.

You can gamble $199 on a rebuilt warm-up regulator (WUR) from Fastlane/Phil or German Star, or you can check the pressures and make sure of the problem.

To check the pressures, you need to buy or borrow a pressure gauge with fittings for Bosch K-jet (they are on ebay), and do some research on how to use it. The 107 CD has instructions, as does Charles Probst's book, as does the Haynes manual. There is stuff here if you do a Search.

You will need a decent metric tool set with extra 14mm and 12mm wrenches, and a multi-meter with a duty cycle setting, because chances are you will need to adjust the mixture via the on-off ratio if you end up replacing the WUR.
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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  #5  
Old 08-22-2007, 05:40 PM
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thanks. I think I will go to my mechanic and get it done right.
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  #6  
Old 08-22-2007, 06:03 PM
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Quote:
Originally Posted by ctaylor738 View Post
This can be a really good chance to learn, but it is not a good area to charge into without some knowledge of your K-Jet system.
Just because this could lead to confusion - and OK, maybe I'm a little pedantic, too - his car uses the KE Jetronic system. Probably the same fittings, but if he wants to find a troubleshooting page he'll need to look for the right system.
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  #7  
Old 08-22-2007, 10:01 PM
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Not so - the '85's have K-jet with lambda, no KE until 1986.
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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  #8  
Old 08-22-2007, 10:04 PM
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A word of advice - be sure to tell your mechanic about the rebulit WUR.

Otherwise he might order a new one from the local dealer and do significant financial damage to you.
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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  #9  
Old 08-23-2007, 07:19 PM
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thanks everybody for the input. I'll tell the mechanic about the rebuilt WUR
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