Blowing through ignition coils- 96 4.0 - Page 2 - JeepForum.com
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post #16 of 26 Old 06-22-2013, 06:06 PM Thread Starter
TEXAIR
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By the way, the engine and ECM is out of a Cherokee.

I realize they are the same beast but when I read about the P0351 code it said it could be a bad coil or driver.

Since the mechanic was leading me with questions instead of me dragging info out of him, I figured he was pretty knowledgeable. And the problems he listed were dead on the money with what I was seeing.


89 YJ, 4.6 Stroker, SOA, Waggy 44 and Ford 8.8 w/ARB's. Rollin 35" BFG's. Raptor Lined Body.
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post #17 of 26 Old 06-22-2013, 06:57 PM
Que89YJ
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That is an sbec 2 controller. It is a different setup then yours.
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post #18 of 26 Old 06-22-2013, 07:09 PM Thread Starter
TEXAIR
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Yeah when I did the stroker I used the engine and wiring harness from a 1996 Cherokee.

89 YJ, 4.6 Stroker, SOA, Waggy 44 and Ford 8.8 w/ARB's. Rollin 35" BFG's. Raptor Lined Body.
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post #19 of 26 Old 06-23-2013, 02:16 PM
deathtrap
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Quote:
Originally Posted by Que89YJ View Post
That is an sbec 2 controller. It is a different setup then yours.
96' xj should be a j-tec controller, no?

Last edited by deathtrap; 06-23-2013 at 02:17 PM. Reason: spelling
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post #20 of 26 Old 06-23-2013, 04:52 PM
Que89YJ
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yes
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post #21 of 26 Old 06-23-2013, 04:54 PM
Que89YJ
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there's still no way I can think for the ECU to cause or be damaged buy a coil. I think they're just cheap Chinese aftermarket coils.you need to go with a better coil.
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post #22 of 26 Old 06-23-2013, 07:06 PM
jsawduste
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Quote:
Originally Posted by Que89YJ View Post
there's still no way I can think for the ECU to cause or be damaged buy a coil. I think they're just cheap Chinese aftermarket coils.you need to go with a better coil.
This ^^

Hesco whom used to run AMCs race program only used/uses a factory OEM coil. They have the reliability and voltage output that you are looking for.

http://www.hesco.us/
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post #23 of 26 Old 06-24-2013, 02:21 PM Thread Starter
TEXAIR
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When i get back from my trip i will install the factory coil and ECM (since i alre.ady purchased it). I willa keep an eye on it and report back

89 YJ, 4.6 Stroker, SOA, Waggy 44 and Ford 8.8 w/ARB's. Rollin 35" BFG's. Raptor Lined Body.
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post #24 of 26 Old 06-26-2013, 04:11 PM
JWELK
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Wow, this is really interesting. I don't see how the ECM can open the coil secondary. I can see how poorly gapped plugs may cause the an overvoltage. If the wires were shorted, it may cause the coil to open, but the engine wouldn't run or run poorly.
As Artie Johnson would have said, "velly interesting".
Regards,
Jim W
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post #25 of 26 Old 07-01-2013, 07:23 AM Thread Starter
TEXAIR
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JWELK,

The shop foreman told me that there is no way the ECM will burn out the coil, but the coil could cause the ECM to fail.

I installed the new factory coil and since the ECM was already ordered and received, I installed it as well. I checked all the plugs and verified the gap setting was correct. The plugs looked good too. I pulled the cap and noticed bad pitting on the contact points and the rotor was badly pitted too. So I replaced those as well.

I was still unsure of the difference between the factory coil and the after market coil. he main difference I see is that the factory coil is made in Japan while the after market is Chinese made. The other difference is the size of the pins on the plug. The factory coil pins are actually thinner which surprised me. But the plug seems to fit better with little movement. Strange but interesting.

I will drive it and see if the problem is taken care of. It may be awhile, but I will try to report back.

89 YJ, 4.6 Stroker, SOA, Waggy 44 and Ford 8.8 w/ARB's. Rollin 35" BFG's. Raptor Lined Body.
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post #26 of 26 Old 07-01-2013, 03:25 PM
idaholtby
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Watching this with interest. For one... is the code stored actually real? Seems so as a replacement coil and an Ohm test of the secondary in fact confirms this (or has it?). What are the ohm values of the secondary of the failed coils versus a new coil? Just want to make sure we are not chasing our tail here.
As others have stated the secondary of the ignition coil can only be blown from bad spark plugs or wires to/from. The ECM only supplies a ground to allow this circuit to complete, no current involved with respect to the ECM. I also wonder if this rig is using a Cherokee ECM or Grand ECM with 4.0L? Are you soley relying on OBDII codes to diagnose? What codes are stored with the OBD1 key method?
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