1977 280SE (W116) Failed Colorado Emissions Testing - Page 2 - Mercedes-Benz Forum

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post #11 of 19 (permalink) Old 07-15-2016, 01:58 PM Thread Starter
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Originally Posted by Fonzi View Post
First I knew I had fuel pressure issues because the car had trouble starting often. It turned out that my accumulator was so horribly bad and leaking back to the tank that it caused the car to not start.
Fonzi - This car also seems to have a bit of a fuel issue. About 25% of the time when cold starting it does require giving it a bit of gas to turn over. It was next on my list to look into. I didn't think it would effect emissions, though. But maybe it does?

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Originally Posted by rumb View Post
the mixture adjustment is done with an allen wrench. This doc will show you where it is.
rumb - Thanks for the info and PDF. That helped a lot! Unfortunately, I was right in thinking that flathead screw by the distributor on my car was the mixture adjustment screw. Not sure why it is there instead of the Allen screw. I can't get the screw to budge at all and I'm afraid of stripping the head. How hard to turn is the original Allen screw? Attached is a photo but it's kind of hard to see.

Thanks again for the advice everyone!
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post #12 of 19 (permalink) Old 07-15-2016, 03:19 PM
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I've never had a mixture screw I wasn't able to get to, or had to mangle anything to get to it, but here's a pic of what someone did to my 1992 500sl before I owned it.

1977 280SE (W116) Failed Colorado Emissions Testing-imageuploadedbyautoguide1468620959.431006.jpg

As you can see, sometimes it seems people have to take drastic measures to be able to remove the protective screw or cap that protects the actual 3mm Allen head mixture screw that is below (... and spring loaded on my 500sl, meaning I need to press down on the Allen screw with my Allen wrench to get it to engage the actual mixture screw below because I can have the Allen wrench seated and spinning and doing nothing, all of which just makes it even harder to adjust the mixture).

Pardon my run on sentence. I didn't feel like putting a period in my parentheses.

.

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post #13 of 19 (permalink) Old 07-15-2016, 03:37 PM Thread Starter
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Well, after letting the screw soak in the PB Blaster for a while I finally got it to budge. Unfortunately, the screw doesn't seem to do anything.

I let the car get up to temperature, and turned the screw a quarter turn counter-clockwise. I waited for about a minute with no changes. Did the same thing 3 more times. No changes. By the end, the screw was all the way out and the engine was still running the same. What is going on? Am I screwed? No pun intended haha

Attached is a picture of the screw and hole.

Thanks!
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post #14 of 19 (permalink) Old 07-15-2016, 03:42 PM
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I think that you just removed the protective screw from the hole. now you should be able to put the allen wrench down that hole.
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post #15 of 19 (permalink) Old 07-15-2016, 03:55 PM Thread Starter
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I think that you just removed the protective screw from the hole. now you should be able to put the allen wrench down that hole.
Ahhh! Yes! Thank you! I was expecting the cap to be rubber or something.
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post #16 of 19 (permalink) Old 07-16-2016, 08:12 AM
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The clowns in Colorado are worse than the ones in California. Good luckand best wishes - I hope this all comes to a happy conclusion!
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post #17 of 19 (permalink) Old 07-16-2016, 08:32 AM
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Quote:
Originally Posted by tristankelley View Post
Ahhh! Yes! Thank you! I was expecting the cap to be rubber or something.

So... Are there any results to report after this discovery yesterday?

I imagine you would have at least dialed in the mixture for optimal running, if not gotten it back to DMV for another test.

.

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post #18 of 19 (permalink) Old 07-16-2016, 10:04 AM Thread Starter
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Just got home from another test and IT PASSED!! Results attached. I pushed it pretty lean for the test. When stopped at a light the idle was a little rough so when I got back home I notched it back up a little less than a quarter of a turn. Running great now!

Thanks so much to everyone for sharing your wisdom!
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post #19 of 19 (permalink) Old 07-16-2016, 11:57 AM
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That's great news, thanks for letting us know.
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