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P0304 Code & ETC Warning Light

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Old Jan 27, 2013 | 01:17 PM
  #11  
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Originally Posted by LSU Tiger Jeeper
My check engine light came on as well and I brought it to the dealership, they told me misfire on #4. Service guy told me that this is a known issue and a need the head replaced for those cylinders, having work done this week. He said oil burn and rough idle is common with this issue. I have 25k on mine. I'll let you know how it goes.
Did they give you a cost estimate? I'm not under any warranty.
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Old Jan 27, 2013 | 01:37 PM
  #12  
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Originally Posted by Hack12

Did they give you a cost estimate? I'm not under any warranty.
Nope, it's still under warranty. I'll ask about cost when I bring it in this week and let you know.
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Old Jan 27, 2013 | 01:45 PM
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Originally Posted by LSU Tiger Jeeper

Nope, it's still under warranty. I'll ask about cost when I bring it in this week and let you know.
Thanks. My CEL has gone off and it has been running great all day. I planned on replacing the spark plugs tomorrow, but now I'm wondering if I should just bring it in and have them go through the hoops to see what the real underlying problem is, if any at all.
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Old Jan 27, 2013 | 07:00 PM
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Also, this is what I'm getting after a cold start.



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Old Jan 28, 2013 | 05:54 AM
  #15  
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Well, it's at the dealership now, just dropped it off. Let's see what they tell me when they call me back with an estimate.
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Old Jan 28, 2013 | 08:01 AM
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The dealership just called back and confirmed the cylinder 4 misfire. They are going to change the spark plugs, update some computer module, and reset the CEL for $212. As far as the loss of oil, they recommended a carbon flush at the time of my next oil change. They also said my PCV valve was fine.

Last edited by Hack12; Jan 28, 2013 at 08:32 AM.
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Old Jan 28, 2013 | 12:12 PM
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Dealership also updated my Powertrain Control Module. Anybody know what that entails?
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Old Jan 30, 2013 | 06:11 AM
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Alrighty, so got my Jeep back from the dealer and everything seems fine. It's been a couple of days and so far there has been no sign of a returning CEL. The dealership only changed the spark plugs and updated the PCM.

However, I am noticing a slight tremble just before I come to a stop, when the RPM's are at their lowest. It idle's perfectly though, no roughness. I can't remember it doing that before. Any thoughts would be greatly appreciated.

Last edited by Hack12; Jan 30, 2013 at 06:20 AM.
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Old Jan 30, 2013 | 11:05 AM
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Anybody on that last question?
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Old Jan 30, 2013 | 12:48 PM
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Bueller???
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