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Old 12-27-2012, 12:43 PM   #1
cyfocus01
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coil bad?

Ok, I've messed around with my missfire. It appears I've lost the number 2 spot on my coil. Tried different plugs, wires, even ran with plug pulled on wire with no spark. Pulled #2 wire from coil while running and no effect while running. So is it really possible to just lose one output on coil like that? Anyone else experienced or heard of this? Thanks all


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Old 12-27-2012, 06:38 PM   #2
BC_ZX3
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Possible, but rare, I'd say. However, your testing procedure is logical.
Work back from the plug renewing suspect components - the plug itself and the spark plug lead (make sure the leads snaps onto the plug end with a firm "click") - and if that hasn't gotten you anywhere, the next logical diagnosis is internal coil failure. (You can rule out the coil electrical connector because the plugs are wired to fire in pairs ( 1 and 3 and 2 and 4) and you've only got no spark on one cylinder, #2. If it was the connector at fault, you'd have lost both #2 and #4).
Lucky for you, ignition coils are fairly cheap and easy to swap out. Once you have the coil removed, check the underside; any cracks that allow moisture in may be the source of the odd failure.
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Old 12-29-2012, 11:11 AM   #3
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OK, so I replaced the coil, and WHAMO! Smooth, my hesitation is now gone also. Have not set cruise, 40ish, to see if it cured that too. Always had a chug or miss, but not consistent, 35-45. Also have not got to highway speed to see if that random stutter is gone too. I am going to guess/hope so.

I question if this will take care of my EGR codes and random O2 sensor code. Hope so. I figure she ran a bit "rich" by what the sensors were telling PCM with #2 not firing consistently. It always was a dog off the line with stutter or hessitation, but once above 3,000 RPM it pulled hard. Guessing that the combination of rpm and compression helped it out up top, like a desiel.

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