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#1
05-17-2007, 07:46 PM
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420 Help!!!
Hello my firens has an 1987 420sel.
It has a bad "miss" feels like a dead hole!!! It has good plugs-distributor cap-rotor button-wires. No leak at any of the injector seals. Cam timing ok, marks on came match with "0" on the crank Don't know about fuel pressure, but both pumps work. Runs smooth above 2000-2500 but it shakes BAD @ idle!!!!!!!  What the H!!!  O can the fuel mixture on the air horn be just out??? Chris 
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#2
05-17-2007, 08:45 PM
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Yes it can,check the on off ratio,at x11, set the fuel mixture,what is the idle rpm? the Eha and the potentiometer may need some help too. But the basics of plugs wires and cap/rotor is good to know,did you check the wires for resistance? to much resistance is not uncommon and will give a dead hole!
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#3
05-18-2007, 05:59 AM
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Not using resistor plugs are you??
__________________
1988 W126 420 SE beware of fundamentalists!
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#4
05-18-2007, 10:07 AM
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you need an exchange fuel distributor,went thru same thing with my own car two weeks ago.
__________________
David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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#5
05-18-2007, 01:02 PM
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same problem!
I also have same problem.I run very well on the open road, but when I'am stoped at red lights and while idleing it feels like it is missing. Same answer also?
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#6
05-18-2007, 01:14 PM
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same problem!
I also have same problem.I run very well on the open road, but when I'am stoped at red lights and while idleing it feels like it is missing. Same answer also?
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#7
05-18-2007, 08:40 PM
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420 "miss"
The wires are good! Plugs are the correct ones!
It misses soo bad.....scary bad But I went over and loosened up the injector lines on the fuel distributor, some fuel came out within half a turn, others I pulled the line all the way off and I found many of the not affecting the idle, so I think it's toast!!!
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#8
05-18-2007, 08:47 PM
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420
This was the worst miss I have ever felt and I work at a GM shop!!!
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#9
05-18-2007, 08:50 PM
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This miss makes everything shake!!!!
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#10
05-19-2007, 10:38 AM
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go get a fuel distributor,specialtauto.com then you will be at peace with your benz.
__________________
David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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