PeachParts Mercedes-Benz Forum - View Single Post - M103 300E runs like crap. And I'm out of ideas!

tbomachines · #5 07-10-2012, 05:54 PM

Well I MAY have found the smoking gun! I just took off the IACV and cleaned it out (also made sure it was functioning fine by supplying a 12v charge. Flipped open and closed like it should. When I put it back on, I noticed the rubber tube was a tiny bit cracked on the bottom. My stethoscope also picked up a distinct sucking sound...I was able to flex the IACV up and down slightly (we're talking maybe 1mm)and it would vary the air sound yet would clearly and repeatedly give me my symptoms. Flex down (sealing it) and it would run fine), flex up and it would give me the stalling when I revved the throttle a bit. I'm happy I finally found SOMETHING that could be leading to this issue. But, FWIW when I had the camera running today it didn't reproduce the issue at cold start, go figure. I wouldn't be surprised if very slight variations in temperature would cause that little hose to expand and contract enough to do that.