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  1. E

    04 Liberty 3.7 2WD, Really rough idle cold

    Don't know about the coil packs condition. Maybe I could buy one and switch them out one at a time to check that?
  2. E

    04 Liberty 3.7 2WD, Really rough idle cold

    If there is a misfire problem, would it cause idle with engine cold to be much much rougher than idle with it warmed up?
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    04 Liberty 3.7 2WD, Really rough idle cold

    I have a "scangauge" that I keep plugged in to the OBD. Gives me several realtime info things. Also checks for and clears codes, doesn't show any. I imagine a more sophisticated scan would do more, but I havn't taken it to a shop that can do that. $$$.
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    04 Liberty 3.7 2WD, Really rough idle cold

  5. E

    04 Liberty 3.7 2WD, Really rough idle cold

    I took the pcv valve off and shook it, it rattled, so I assume it's OK. Wouldn't a misfire throw a code and set a CEL?
  6. E

    04 Liberty 3.7 2WD, Really rough idle cold

    One odd thing that I'll have to try again just to see if it's real: I disconnected the battery overnight a while ago, and next morning connected it and started the car.
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    04 Liberty 3.7 2WD, Really rough idle cold

    Actually, cold here in Southern California isn't very cold, about 50 degrees. (I grew up in Northern Michigan where cold meant cold, finally got out of there) First thing I done on the car was to change the oil to 5-30 full synthetic.
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    04 Liberty 3.7 2WD, Really rough idle cold

    Thanks, That was the first thing I tried, put in new NGK coppers, didn't make a difference. The thing that puzzles me is, why is it so much worse cold than after it warms up? I'm thinking of replacing the upstream O2 sensors, but hate to just throw more parts at it.
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    04 Liberty 3.7 2WD, Really rough idle cold

  10. E

    04 Liberty 3.7 2WD, Really rough idle cold

    Loving this forum. A month or so ago I picked up this 04 liberty, 130,000 miles on it. When I start it cold, the whole car shakes really bad. This is in neutral and also in gear. When the engine warms up and idling, it's pretty good, some slight roughness, but acceptable anyhow. Tach is...
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