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#1
05-21-2008, 02:39 AM
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Minor issue with 500sl, possibly fuel related?
My 500sl died twice on me this evening. I was pulling into my neighborhood, hit a small bump, then dead. After some cranking, she started right up, only to die again in a short distance. The third try she started immediately and drove all the way home like normal. I let her idle in the garage for 5 minutes, no problem.
Things I noticed had changed: My economy gauge is on the extreme left side, and will not go past the middle mark when the engine is revved. My idle is very low, about 500rpm. Both times the car died when I let off the gas pedal. Any ideas?
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1985 500SL Euro w/ AMG bits 130k  1984 300SD Turbodiesel 192k  1980 240D Stick China 188k  2001 CLK55 AMG 101k  2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!! 
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#2
05-21-2008, 08:03 AM
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Quote:
Assuming from you avatar, you have a R107. Cutout issue sounds like a faulty fuel pump relay. Isn't full left max vacuum? Another possibility is a bad fuel pressure regulator, are you seeing lots of black smoke? The overvoltage (OVP) protection relay has a blade fuse on the top of it, check tosee if it is blown, this can cause a faulty idle. Jim
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14 E250 BlueTEC black. 45k miles 95 E320 Cabriolet Emerald green 66k miles 94 E320 Cabriolet Emerald green 152k miles 85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles
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#3
05-21-2008, 10:57 AM
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I just had amost the exact same symtoms on an 83 380 sel. At one stop light it was fine, at the next it would not idle. RPM's would drop to below 500, with black smoke, and it would stall. It would restart instantly and run at speed, though with reduced power.
The solution was a $18.00 Bosch universal O2 sensor. As soon as it was in place the car went back to runing and idling perfectly.
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2000 Mercedes S500 1990 Mercedes 560SEL 1970 Triumph Spitfire
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#4
05-21-2008, 12:51 PM
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If you are saying that your vacuum seems low, look for vacuum leaks, especially broken lines, bad connectors. Check the functioning of the EGR valve if the car has one.
You may have a problem with idle control relay or idle air valve.
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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
05-21-2008, 05:23 PM
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No smoke, and the vacuum gauge has went back to normal this morning. The car drove normally. Gremlin?
__________________
1985 500SL Euro w/ AMG bits 130k 1984 300SD Turbodiesel 192k 1980 240D Stick China 188k 2001 CLK55 AMG 101k 2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!
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