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87' 190E 16V / 93' 600SL / 02' G500
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Discussion Starter #1
Wife's out of town until close to Christmas and thought I would try to keep her away from the SL and SEL and buy her a Benz of her own. I ended up with a very clean 78' 250 Euro Spec with 175,000KMS. The car has been sitting for a couple of years and with a fresh battery fired right up. The reason for this post is before the car was put away the owner complained of seriously poor fuel mileage and I can confirm despite starting and idling beautifully (I have yet to drive it) It runs very rich. Would any of you have a diagram of the Solex that is currently in the car so when I disassemble or attempt to adjust I will know where to look for the appropriate screws. I'm thinking needle and seat leaking or problem with the float. I did check for binding throttle plates due to warpage and it checked out OK. Thanks for looking and any assistance with the wife's present... I will let you know if I get BEAT to within an inch of my life and the heads up on the following fire sale...
 

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87' 190E 16V / 93' 600SL / 02' G500
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1,197 Posts
Discussion Starter #3
Thanks for the info! I will give it a go and see if I can lean the beast out.
 

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1991 300zx 2+2 @ 129k Miles.
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Im sorry I cant add any help, but I must say that I love the color pattern of this car 100%. The interior and the exterior are amazing. I am certain she will love it...and if she does not, please feel free to give it to me lol.

Good luck
 

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87' 190E 16V / 93' 600SL / 02' G500
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Discussion Starter #5
Well I gave it a shot. I screwed in the CO screw and just as it bottomed out the idle raised just a bit still very smooth and continues to smell rich. Next step I think will be to remove the top plate and inspect/adjust the float and check the needle and seat. One question first. The 2 solenoids down by the CO screw are the serviceable? Anyway to check operation? I assume they also control mixture. And thanks for the kind words Whippy.
 

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W-1-2-3 Go!
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Yes, that's a very nice gift. Stark contrast between the beautiful paint and black interior! Only in Europe.

Good luck with the fix, not many W123 gas-engined model owners here. Nutz and a few other M123 owners might be able to help with that.
 

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85 Audi Coupe Quattro, 85 Audi Coupe GT, 71 BMW turbo 2002, 73 BMW 2002tii, 85 BMW 635csi
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Have you checked the second stage damper with a vacuum gauge to see if the diaphragm is ruptured?
Going in though seems prudent. You may have a bent needle, and if so, it's a B4, not a B2 like the ones found on M110's.
Also, are you positive the ignition system is up to par? Like possibly the coil is weak, plug wires have too much resistance, incorrect gap on the plugs,
dwell angle set correctly, etc....
 

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'89 300TE, '79 450SL, '01 ML320
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The two solenoids are the idle valves, to check operation... with ignition on disconect/re-connect one
at a time, you should here an audible click.
If not check for power at the yellow/green wires, brown is ground. They are removable, use care
not to mess up the seats.

Like Nutz said be sure your ignition system is A-OK before you mess with the carb too much. And be thankfull you only have a single carb :)



Fish
 

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87' 190E 16V / 93' 600SL / 02' G500
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Discussion Starter #9
That is a good point. I did check the gap on the plugs after brushing off the carbon. I always thought Bosch coils were pretty reliable but it never hurts to check. The plugs that are in it W7DC good, bad, ugly? Ignition timing is at TDC with vac advance hooked up. As for the secondaries I did hand throttle the carb a few times full throw and found this
- did not see any fuel coming from the accelerator jets on the secondaries either side
- a good clean stream of fuel from the right side primary (facing carb drivers side)
- a large gush of fuel out of the primary left side (facing carb passenger side)
I do have to hit the accelerator about 5 times to start it cold. I am surprised the thing idles so well
 

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85 Audi Coupe Quattro, 85 Audi Coupe GT, 71 BMW turbo 2002, 73 BMW 2002tii, 85 BMW 635csi
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Static timing is supposed to be 8° BTDC @850 rpm
Check dynamic timing @ 4500rpm with vacuum 45°-49° BTDC
Also, the M123 calls for W6DC gapped at .032"
 

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87' 190E 16V / 93' 600SL / 02' G500
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Discussion Starter #11
Thanks for that. Will get new plugs, check spark and set timing tomorrow. Times a ticking
 

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85 Audi Coupe Quattro, 85 Audi Coupe GT, 71 BMW turbo 2002, 73 BMW 2002tii, 85 BMW 635csi
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Best of luck finding those plugs, you're gonna need it.

Also try Beru 14-6D or 14-6DU
or *bleh* Champion N8Y
 

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87' 190E 16V / 93' 600SL / 02' G500
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Discussion Starter #15
Thanks for forwarding that link FISH it was just what the Dr ordered! Thanks for the compliments on the pumpkin.
 
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