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    2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code

    UPDATE TO THIS PARTICULAR THREAD REGARDING "IGNITION CAPACITOR" 1. I went over the 2003 KJ Jeep Repair Manual in detail. 2. There is some amount of vague explanation *and* diagramming in multiple locations in the Manual regarding the maint of a 2.4L inline 4 cylinder... and the 3.7L V6. 3. I...
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    2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code

    To everyone: I cannot begin to describe how cool, and helpful, the Forum members have been. You have my promise that I will put together a complete walk thru of this work and had it over to the moderators to park it wherever they think will benefit everyone in the future. The more I get to...
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    2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code

    @derekj, a couple of clarification questions: 1. Was your Liberty actually throwing p03xx code(s) before you rewired the drivers side? 2. When you rewired, did you (a) actually run 3 pairs of coil wires from the coils all the way back to the PCM (what I am imagining to be a true "bypass")...
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    2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code

    @yrvmrv98, hello and thanks for the suggestion... I normally let the Oil Shops handle fluids (too much hassle with disposable toxics) but I know what they use, so having an extra bottle in the garage is np.
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    2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code

    @MarkG thank you for the response. I've been climbing all over the place tracking wires and their physical status. The isulation looks and feels old (sort of rough on the outside but I'm hoping its just 20 years of road dust), but it's still intact. Paid close attention to the insertion points...
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    2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code

    @Ksat, thank you for the response and your thoughts are excellent. Yes, I've tracked the color coding as far I as I could without starting to really unwrap the harness, which is really showing age. I want to avoid pulling it apart until I can find someone who understands the physical...
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    Capacitor

    BTW, I am working on a 2003 3.7L Sport engine replacement.
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    Capacitor

    Was there ever a resolution for this post? I found the replacement part (Advance Auto Parts has it). At some point in the last year a mechanic apparently disconnected the wire from it, and then my guess is that whoever did it either (a) wrecked the connector, (b) wrecked the capacitor, (c) all...
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    How Do I test PCM signals to Coil Pack 5/2?

    I've got what sounds like the same problem as yours. Please look here if you have a minute and share your thoughts, thanks! https://www.jeepkj.com/threads/2003-liberty-3-7l-sport-reman-engine-from-tri-star-p0304-code.79802/post-802523
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    How Do I test PCM signals to Coil Pack 5/2?

    Did you ever get this resolved? I have the same apparent problem (p0304) on cyl 4.
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    2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code

    Has anyone ever created a "bypass circuit" directly from the PCM to a particular coil/injector? The thought is that if a bypass is possible, and I can run wires to the coil/injector on cyl 4, that would either confirm/refute whether there is a short buried in the harness somewhere. I would...
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    2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code

    ..and also recommended by "klc"... thanks everyone.
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    2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code

    I ordered the pure copper plugs as recommended by "LibertyTC".
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    2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code

    :-) ...that's the same manual I've been decyphering for the last week.
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    2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code

    Compression tests on cyl 4 have been done at least twice now and every time it comes back normal. That is the reason why the possibility of a bad valve has been rejected. When the PCM stored codes have been erased (using an Ancel AD 310 handheld plugged into the bus), the engine runs smoothly...
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    2010 Jeep Liberty Engine swap with 07 Dakota 3.7 now rough idle and codes P0300 P0301

    Did you ever get this resolved?
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    2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code

    That's what I got from what I've read too. So is that capacitor connected to the radio or to the ignition circuit?
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    2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code

    Ok, that's excellent news. Is it an after market gizmo that isn't necessary, and can it be removed safely? If other 2003 Liberty 3.7s have the block, and no misfires, then I'm neutral... but if this is a "nice to have for the benefit of some garage mechanic", I would like to minimize...
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    2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code

    "Missing Ignition capacitor" Apparently there is supposed to be one of these installed (see capacitor_b1 photo) on the left engine compartment firewall (see cpacitor_b2 photo) according to the manual (see capacitor_b3 photo). The point of a capacitor (I'm no electrician but I can understand...
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    2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code

    "Mysterious heat sink block". Does anyone know what this is and why it is necessary? The location is the inside wall of the left front wheel well, under the power distro center (fuse box).

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