Originally posted by bluestripe67
My '89 300TE was running rough at idle, just not the same old smooth self. Having been told by an independent Merc. shop that Techron works on cleaning injectors I though I would try a bottle with 3/4 tank of gas. It made all the difference, the old smooth idle is back and that's all I did. Food for thought.
Are your fuel injectors still original or have they been replaced? The reason I asked is because my 300 TE starts rough on cold starts ( 1st start in the morning) for about 1 second, then idles smoothly afterwards. It only happens in cold starts.
92 300 TE (m103) 114K miles