Lambda Duty Cycle % question
On the '92 300E I have adjusted the Lambda % 3 times. It runs better. I do have to say that. HOWEVER I think something may be out of whack or just completely out.
I can get the duty cycle where it averages ABOUT 50%. I am using Larry Bible's guage and it jumps as much as 7%. Each time I have checked it has been way off the 50% to which I adjusted it the last time. Instead of stalling, it now just "coughs" when I start from a complete stop. Not consistent, just frustrating especially when cold. It will die almost every time. I have seen in the DIY where the duty cycle was on 50%. Should mine be doing that or will the fluctuate in %. What could be out to make it do this (EHA, Throttle body, Lambda controller?). I'm actually begninng to have hope. HELP!!! |
Check out what Steve Brotherton had to say in this post:
http://www.peachparts.com/shopforum/tech-help/26158-duty-cycle-300e-idle-speed-control.html?highlight=50%25 |
Thanks for the link! Every time I check it has changed. 2 days ago I set it to between 45-50%. Then last night I checked again. It was at 30%. Do I have a bad adjustment screw that isn't holding? It runs GREAT after adjustment but just won't hold. That's the great mystery.
The few days it was running rich...could I have cooked my 02 sensor? |
I had a similar problem. I could get the duty cycle set at idle but when on the freeway it would move out if range and vice versa. It turned out to be the fuel distributor. I cleaned it with brake cleaner solvent and the problem went away. Since your adjustment keeps moving I would consider the possibility of something associated with the fuel delivery system.
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Dave,
You said you cleaned the fuel distributer... Did that require removing the throttle body? I hestitate to dig to far into it, but I'm definitely game. My distributer governor has been replaced. The fuel pressure regulator has not. When I press down to adjust the allen bolt to adjust Lambda the bolt tends to stick down and I must "fiddle" with it to get it back up (good southern term). I'm all ears (eyes in this case...) as I'm going to TRY to get it solved this weekend. |
My fuel distributor was easily removed. The throttle body does not have to be touched (at least on my 420's it didnt). Remove it, whatever it takes and I used "brake parts cleaner" by Albany. It is a great solvent. I sprayed it in all every place I could. In all directions possible. I shook it while the stuff was inside it. I operate the plunger and generally worked it over with the solvent as best I could. The gremlins went away. It has worked great ever since. In my case the car had not been run for 1.5 years and I presume that the fuel had left a varnish deposits inside the thing.
Good luck. |
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