PeachParts Mercedes-Benz Forum - View Single Post - Idle Speed Air/Control/Slide Valve Confidence Check

dpetryk · #11 02-06-2009, 07:16 AM

I have had all of the issues discussed here and I have found the solution. But first a little history.

One of my cars had the high idle syndrome. I checked all the systems involved with the idle control and everything was working. I ended up replacing the idle control valve with a new unit and it solved the problem. I was confused because I had checked the original ICV and it was working but it could not control the idle. So now I measured the actual performance of the original against the new one I had just installed. I measured valve movement against current applied to the coil. I could not find any difference between the two. Why did one work and not the other? I needed to find out.

After a lot of time I found out that the valve is "adjustable" and making that adjustment solved my high idle speed problems. The adjustment is set at the time they are made. You can change this adjustment and reduce your idle to the right level.

I ended up adjusting my original valve and everything is good with the world again.