on vcds in channel 13 (idle speed smooth runing control) i noticed higher value at cyl #4 than other three cylinders the value is sometimes around 1.84 at coolant temperature 85 degrees and if coolant is around 70 degrees the alue on cyl #4 is around 2.33 i wonder what this means ?? other three cylinders are around zero.I certainly sympathize with you here, but am out of ideas. Exhaust or intake clogging? Start from the beginning and double check?