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#1
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420SEL getting 'way too much fuel from its F.I.
I guess I've screwed up my 420SEL. It started running really badly, and a mechanic told me I needed a new fuel distributor, so I installed one. While I was at it, I cleaned out the EGR passage in the intake. Now it won't start. The F.I. is giving the engine 'way too much fuel, and I can't seem to reduce it with the air sensor plate adjustment. That adjustment screw seems to be stripped out or something; it doesn't seem to want to engage anything when I turn it. When I pull the plugs and crank the engine, I can hear the fuel squirting into the combustion chamber.
Any ideas about what I screwed up, and what I should do to correct it? Thanks in advance. |
#2
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you have to push the 3mm down and twist until it locks into another 3mm to make the adjustment.it is normal nto have to make a large change[1-3 turns] at the adjustment when you change out the fuel dist.easy way to find a starting point is to jump the fuel pump relay so pumps run all the time and if you hear the injectors sqirting turn counter clockwise until they stop.now you have a starting point.the car should start once you dry out the plugs.
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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 |
#3
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No, see that's the problem, I've had to adjust it before and I know how to do it, but it doesn't do anything now. I push it down all the way and turn, and it doesn't catch on anything. Or, rather, every fifty to a hundred turns it will catch for a quarter turn. Extremely tedious. Maybe I should lift the top off the fuel distributor and see what's going on under there.
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#4
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You can also replace the adjusting screw piece if you think it may be broken.
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1980 500SE/AMG Euro 1981 500SEL Euro 1982 380SEL 1983 300TD 1983 500SEC/AMG Euro 1984 500SEC 1984 300TD Euro 1986 190E 2.3-16 1986 190E 2.3 1987 300D 1997 C36 AMG 2003 C320T 4matic past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350 |
#5
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Thanks a lot for your help, David and John. We got it running, and it really hauls derriere!
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#6
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What did you find out?? what was the problem?
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#7
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The air flow sensor had not been set back to its baseline adjustment when we replaced the fuel distributor.
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