BenzWorld Senior Member
Date registered: Oct 2010
Vehicle: '11 Santa Fe LTD V6 AWD-Navi, '99 CLK 320 (traded for family mover), '96 200SX (SOLD) :(
Location: Hanmer, ON, Canada
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Quoted: 1 Post(s)
After doing the whole reset ECU thing and still having rough idle, i further investigated the issue (thinking it might be the MAF sensor) and i discovered a loose (at this point unplugged) vacuum line just at the rear of the engine on the driver's side under the engine cover. Plugged it back in and voila!, no more rough idle. We'll see over the next couple of days how it goes.
It seems the rubber elbow of the hose was sitting partially on the steel hard line it plugs into causing intermittent rough idling until finally it just came off altogether making it almost chug at idle. Hope this helps others. it was pretty apparent once under the hood because you could here the distinct hiss (much more pronounced than normal). I can see how this would happen as it sits precariously close to the path of the support for the cover when putting it back into pace.