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Rough idle when cold and check engine light comes on

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.


  • 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
  • fblack94fblack94 Posts: 1

    Any one of you guys figured out the problem? Just bought a Liberty Renegade 2006 and it started exhibiting these exact signs the next day...

  • On 9/1 the day after an oil change and passing inspection, my jeep started to shake, check engine light came on, and when I stepped on the gas we went nowhere. Its now 12/16 and I still don't have my vehicle back. The PCM chip was replaced twice, after a tune up, it showed a misfire, the ABS module was replaced, the compressor on the A/C replaced,they ran it out of fuel to make sure the fuel pump was ok, and now its a complete engine tear down. I'm now told that the heads were sticking. Its an '06 and only has 43,000 miles on it. Anybody else having similar issues???? When I called Chrysler to open a file on this it was like talking to a machine..."and what is it that you would like us to do for you". I'm afraid to bring this jeep home.
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