Hey guys, my 93 ls 400 started making this "knocking" sound that I tracked to under my glove box, not too far from my ecu...anyway, when I pinpointed where the noise was coming from, I saw this downward, grey, cone-looking thing that had VDO on it...can anyone tell me what this is?...by the way, it is made by seimans, if that helps. thanks in advance for anybody's help