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Electrical 3rd Gen Dodge Ram Electrical Problems and Questions.


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  #1  
Old 11-24-2009, 09:03 PM
acooperjr acooperjr is offline
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Angry Did coil take out ECM ?

Hey Gang

Today my truck started skipping. It was running fine when I stopped at a stop light, then when I gave it gas to pull away from stop it was skipping, just like that, no warning. I was only 4 miles from work so I kept going. When I was about 1/4 mile from work at a stop light, smoke started coming out from under the hood (electrical smoke by the smell). So I got to work ,were I had a fire extinguisher, popped the hood and what ever was burning up had already stopped.

I did find #4 coil split and melted plastic coming out of it. So I replaced the coil and truck still skips. Replaced the 8 spark plugs under the coil packs (that is all they had at Napa) I will do other 8 when I get them. Truck still skips.

I found #'s 4,6,3 not firing according to my timing light. I need to check these coils for neg. and pos. to see if they are getting signal from ECM.

Anyone have any idea what may have happened, or better yet what I should look for ? Is it possible the coil shorted and burned up ECM ?

Thanks ; Art

edit; It's a 5.7 Hemi 2004

Last edited by acooperjr; 11-24-2009 at 09:05 PM. Reason: forgot engine
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  #2  
Old 11-24-2009, 09:07 PM
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Do the other eight plugs and let us know how it makes out .
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Old 11-24-2009, 09:10 PM
acooperjr acooperjr is offline
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Quote:
Originally Posted by Toms Blue Ram 1500 View Post
Do the other eight plugs and let us know how it makes out .
I don't know this system, but aren't the other plugs firing on the exhaust stroke ? Waste spark ?
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Old 11-24-2009, 09:19 PM
acooperjr acooperjr is offline
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I do plan on doing the other 8 plugs as soon as I get them. I just thought the 8 under the coil packs do all the work and the others are waste fire, but I don't know this for a fact.
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Old 11-24-2009, 09:28 PM
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Might want to put a set of plug wires on it also . The more resistance you have in the ignition system , the more power the ignition coils put out . You may just have a system that needs to be serviced (tuned-up). The coil may have just burned itself up due to putting out maximium current for a extended period of time .
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Old 11-24-2009, 09:51 PM
acooperjr acooperjr is offline
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Thanks for the input. I'll check that out also and keep you posted.

Art
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Old 11-24-2009, 09:57 PM
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Each cylinder is equipped with 1 dual-output coil. Meaning one coil mounts directly over one of the dual spark plugs for 1 high-voltage output. A second high-voltage output is supplied directly from the same coil (using a plug cable) to one of the dual spark plugs on a corresponding (paired) cylinder on the opposite cylinder bank.

Each coil fires 2 spark plugs simultaneously on each of the cylinder banks (one cylinder on compression stroke and one cylinder on exhaust stroke). EXAMPLE : When the #1 cylinder is on compression stroke and ready for spark, the #1 coil will fire one of the dual spark plugs on the #1 cylinder (directly below the coil). The other dual spark plug on the #1 cylinder will be fired by the #6 coil. At the same time, the #1 coil will fire a “wasted spark” to one of the dual spark plugs at the #6 cylinder as coil #6 also fires a “wasted spark” to one of the dual spark plugs at the #6 cylinder.

The firing order is paired at cylinders 1/6, 2/3, 4/7, 5/8. Basic cylinder firing order is 1–8–4–3–6–5–7–2.

Are there any misfire codes, or insuffiecient ionization codes present?
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Old 11-25-2009, 07:22 AM
acooperjr acooperjr is offline
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Quote:
Originally Posted by Remerson228 View Post
Each cylinder is equipped with 1 dual-output coil. Meaning one coil mounts directly over one of the dual spark plugs for 1 high-voltage output. A second high-voltage output is supplied directly from the same coil (using a plug cable) to one of the dual spark plugs on a corresponding (paired) cylinder on the opposite cylinder bank.

Each coil fires 2 spark plugs simultaneously on each of the cylinder banks (one cylinder on compression stroke and one cylinder on exhaust stroke). EXAMPLE : When the #1 cylinder is on compression stroke and ready for spark, the #1 coil will fire one of the dual spark plugs on the #1 cylinder (directly below the coil). The other dual spark plug on the #1 cylinder will be fired by the #6 coil. At the same time, the #1 coil will fire a “wasted spark” to one of the dual spark plugs at the #6 cylinder as coil #6 also fires a “wasted spark” to one of the dual spark plugs at the #6 cylinder.

The firing order is paired at cylinders 1/6, 2/3, 4/7, 5/8. Basic cylinder firing order is 1–8–4–3–6–5–7–2.

Are there any misfire codes, or insuffiecient ionization codes present?
Thanks for confirming how it works. That is what I thought by looking at the coil and wire layout.

I don't have way of getting codes, so I'm going to see if the 3 cylinders that are not firing are getting a primary signal to coils. If not does that mean bad ECM or is there somthing else driving the coils ?

Thanks; Art
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Old 11-25-2009, 10:17 AM
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Coil control is within the pcm. You may want to try going to a local parts store and seeing if they will scan the pcm for you. Some will do it for free or a small fee. The codes will give you a better route to follow to a diagnosis.
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  #10  
Old 11-25-2009, 08:42 PM
acooperjr acooperjr is offline
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There is low or no primary volts at 4 of the 8 coils. It's runing on 4 cylinders. I'm guessing the ECM is bad. I'm also guessing that the ECM has 2 coil drivers in it (4 coils on each driver) and one of them burned up when the coil burned up. But that is just a guess. So I took it to a local repair shop to be checked out.
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