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Old 04-13-2009, 08:12 AM   #1
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04 Rubicon, Ignition system

Still trying to get back on the road, I have an additional question concerning the ignition system... 2004 Rubicon 4.0 inline 6 AT

Is there an Ignition Module on the 4.0 liter? I have changed the plugs and ignition coil. The coil is getting hot and she is running rough. So I am thinking ignition mod change next... can't seem to locate it?

Thanks for all the help,
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Old 04-13-2009, 10:12 AM   #2
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What? You say you changed the ignition coil? Newer 4.0L engines like yours don't have the usual ignition coil, they have three separate ignition coil packs that sit directly on top of the spark plugs, two plugs sharing a coil pack. The ignition system is fully contained within the PCM (engine computer) so it's not something easily changed.

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Old 04-13-2009, 11:10 AM   #3
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It has one long bar with all three coils incased with in. The one closer to the firewall is the one over heating, but the codes are telling me Coil B.
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Old 04-13-2009, 11:17 AM   #4
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I can't say for sure, but is Coil B failing and causing A to either pick up the slack or to receive all the juice meant for B? I'm not sure how exactly those work, just seems like a logical deduction to make.
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Old 04-13-2009, 11:22 AM   #5
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I was thinking along that line, maybe the new coil is bad. Gonna try and return it and see if the parts house helps me out and swaps it...
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Old 04-13-2009, 02:04 PM   #6
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i'd replace the one you're getting the code for.
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Old 04-13-2009, 02:24 PM   #7
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Quote:
Originally Posted by sgblakley View Post
Gonna try and return it and see if the parts house helps me out and swaps it...
Just be aware that few auto parts stores will accept electrical items for return. It's too hard for them to know if the customer simply damaged it from not knowing what he was doing, or it's the old defective part he's trying to return for credit.
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Old 04-13-2009, 03:26 PM   #8
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The coils aren't individually replaceable. You have to replace the entire coil rail as a unit, about $150 at Car Quest. I wouldn't trust one from Autochina, it may work, but not for long.
Dealers sell ones made by Standard Ignition, so does CarQuest - at about $100 dollars less than the dealer.

The ignition module is part of the PCM, not separate.

But first use a thermometer gun - the kind with a laser. Measure the exhaust temps at each cylinder from underneath. Both at idle and 2500 or so. They should all be about the same temp - around 450-500 degrees. If not, replace the coil rail.

And listen carefully - put your ear close to the coil rail - if you hear snapping - replace it.

Each coil in the rail - one end of it fires the plug ready to fire on the compression stroke - the other end of the coil fires the compliment plug (the piston on the back side of the cam) - no power from that, but it helps burn more emissions, called the waste spark. So you could say both plugs fire at the same time. It is much more powerful than the old type ignitions.

It's enough to knock you into the middle of next week! He He - don't ask!


Make sure when you put it on you use a goodly amount of silicone insulating grease on each plug - put a small glob in each boot.

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