Rough idle when cold and check engine light comes on

2 messages, Last post on Oct 20, 2009 at 1:54 PM

What is this discussion about? Jeep Liberty, Gasoline, SUV

#1 of 2 Rough idle when cold and check engine light comes on by oldlegend Sep 13, 2009 (6:15 pm)
My wife has a 2006 jeep liberty, 3.7L engine, auto 4X4. Has 40,000 miles. The problem is suddenly started having a rough idle at start up, and then the check engine light came on. We had a parts store check the codes and it came up random misfire. The check engine light blinked once, pause then 4 times and stays on, which is supposed to be the map sensor. I changed the plugs (gapped to .040) and changed the map sensor. Unplugged the battery for 10 min. and it started out ok. Then it had the rough idle again and the check engine light stays on, and again the engine light shows map sensor. So, any suggestions as to what the problem is and a solution for it. Thanks. Replies to this message: jakesun (Oct 20, 2009 1:54 pm)
#2 of 2 Re: Rough idle when cold and check engine light comes on [oldlegend] by jakesun Oct 20, 2009 (1:54 pm)
Replying to: oldlegend (Sep 13, 2009 6:15 pm) I recently purchased a 2006 jeep liberty. It's been at the dealer more then home. Check engine light on since the day after purchase. Foulded plugs,misfires and very rough idle. Turned out to be(so they say) a defect in one of the heads. Dealer did R & R the head. Have it back one week,check engine light on and rough idle. They now tell me it's a vacuum senser and not too worry about it. Think someone needs to come clean on the whole issue