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  #1  
Old 03-31-2008, 03:13 PM
Hit Man X's Avatar
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Thumbs up M103 + CIS = a frustrated person with questions

Okay gang, some background info:

255k in the 300sel, all rubber has been replaced (vac lines and such). New injectors. New filter, new pump check valve (still on old fuel pump). New O2.

Car still is somewhat difficult to start, cold and hot (cranks more than it should). Tho' hot is easier. Has Bosch cap/rotor/plugs (non resistor)/wires. So that is good. I do have a new cold start injector coming



Recently per the site I have adjusted the fuel distributor at idle and now get a running, hot fluctuation of 41-48%. Before is was 33-37%, so I believe I am closer to what it should be at... people tend to recommend 40-50%. Is a certain percentage preferred over another?

Now one question I have, which direction richens up the fuel mixture? And would this be a higher percentage?

I did turn the EHA half a turn when I first bought the car (why, I can't recall). Would this be corrected for at the fuel distributor's base fuel mixture tower?

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.
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  #2  
Old 03-31-2008, 08:26 PM
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They tend to run better around 40%.

The lower the number ther richer the mixture.
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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
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  #3  
Old 03-31-2008, 08:35 PM
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What is the best place to set the mixture for emissions testing? Lean misfire perhaps? haha

I should probably also add something to this thread...my 300SEL has some of the same little annoyances that hit man outlined. Mine also has a slight misfire at hot idle, super smooth when cold. So I will be following this thread closely!
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  #4  
Old 03-31-2008, 08:52 PM
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The fuel pump relay controls the cold start valve. Check to make sure the cold start valve fires when you turn the key to start.
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Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

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  #5  
Old 04-01-2008, 02:39 PM
Hit Man X's Avatar
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Cold start valve will be here tomorrow, so that may help. I'm going to do that before I adjust the fuel further.

Can the CIS system compensate for EHA adjustments?
__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.
[/IMG]
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  #6  
Old 04-01-2008, 05:47 PM
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Quote:
Originally Posted by Johnhef View Post
They tend to run better around 40%.

The lower the number ther richer the mixture.
And you need to be sure you hook up your duty cycle meter correctly so that 40% really means 40% rather than 60%.
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  #7  
Old 04-01-2008, 08:29 PM
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haha yeah. how are you reading duty cycle anyways? i've got the MB box that plugs right in and gives me a % reading
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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
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  #8  
Old 04-01-2008, 11:09 PM
Hit Man X's Avatar
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Posts: 9,086
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Multimeter with duty cycle readings.

what about my EHA quandary?
__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.
[/IMG]
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  #9  
Old 04-01-2008, 11:19 PM
iwrock's Avatar
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Join Date: Nov 2003
Location: Hella NorCal
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I got like 5 extra EHAs if you want one to mess with....


I have been dealing with CIS issues myself...



Rough idle, power loss unless WOT, hesitation off the line.... Uggh....

Cold start difficulties, better when hot, but not perfect.

But like I said I can send you an EHA or two to play with if you would like....

Just cover shipping...

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91 560 SEC AMG - other dogs dd
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