doctorbrody Posted February 15, 2016 Share Posted February 15, 2016 Any idea what underlying issue might cause the same ignition coil to fail 3 times in 30k miles? All my ground straps are intact and I even have one of those Buddy Club grounding kits. Stock NGK plugs look good. I have an Optima red top battery that's almost 8 years old. It tests fine so I see no reason to replace it. Of course it has to be the #4 coil pack that is a PITA to access... Link to comment Share on other sites More sharing options...
compsurge Posted February 17, 2016 Share Posted February 17, 2016 Is it actually failed? Have you swapped the coil pack to another location? If the coil pack is fine, then the problem lies upstream. Are your harness clips in good shape? Link to comment Share on other sites More sharing options...
doctorbrody Posted February 17, 2016 Author Share Posted February 17, 2016 I've diagnosed all 3 times by swapping the #4 coil pack with #2, which then results in a misfire on #2. The clips are working fine. I'm going to replace plugs along with a new #4 coil pack this time - hopefully that works. Link to comment Share on other sites More sharing options...
GTTuner Posted February 20, 2016 Share Posted February 20, 2016 Are you using an OE coil or aftermarket? Link to comment Share on other sites More sharing options...
doctorbrody Posted February 21, 2016 Author Share Posted February 21, 2016 Always OE coils, but the last two were used ones I got from the junkyard. Just replaced it with a brand new OEM, and replaced spark plugs as well. The coil pack wires had some oil on them - cleaned them and rewrapped with electrical tape and conduit. Is there any way I can measure the voltage the ECU is sending to each coil pack? Link to comment Share on other sites More sharing options...
08SpecB_DE Posted February 21, 2016 Share Posted February 21, 2016 You can if you have a voltmeter or even better, a power probe. Link to comment Share on other sites More sharing options...
compsurge Posted February 21, 2016 Share Posted February 21, 2016 I would suspect at this point that your coil packs aren't the root cause. Look upstream. Inspect the harnesses - there could be a wire short caused by a rodent chewing on wires, pulled out pins, or dry rotted wires. Do you have the factory service manual? It will list the voltage and resistance to check. Link to comment Share on other sites More sharing options...
doctorbrody Posted February 21, 2016 Author Share Posted February 21, 2016 The power probe looks awesome. Maybe I can borrow one from the auto parts store. I'll pull the harness apart as best I can. A mouse was definitely living on top of the block at one point this winter... Link to comment Share on other sites More sharing options...
08SpecB_DE Posted February 21, 2016 Share Posted February 21, 2016 The only issue with the power probe is you can only check voltage. I should have mentioned that earlier. You need ohms to check resistance which any voltmeter will be able to do. They are fairly inexpensive and I'd recommend the Fluke brand and if available pick up a various set of test leads to aid in future use. Link to comment Share on other sites More sharing options...
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