ignition coil inspection

2004 TOYOTA SEQUOIA
275,000 MILES • V8 • 4WD • AUTOMATIC
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VYYPER1
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  • 2 POSTS
can you visually inspect an ignition coil to determine whether it is good? if so, what does bad look like?
Feb 4, 2017 at 7:47 PM
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SATURNTECH9
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 30,869 POSTS
Not usually unless it is visually cracked or something. I would have to say no you cannot. So can you tell me what is going on that you suspect the coil being bad? Any codes in the computer? If so what are the exact code numbers not code descriptions?
Feb 5, 2017 at 8:39 AM
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VYYPER1
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  • 2 POSTS
Just had some misfires recently and per the mechanic. the coils needed to be replaced. This seems to have addressed the misfires. Given I have 275,000 miles, I was wondering if I could check the remaining ones and verify if they require changing? I can do it cheaper than the dealership.
Feb 5, 2017 at 11:23 AM
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SATURNTECH9
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 30,869 POSTS
If the misfires are gone now then I would let be. If you had more bad coils then you would still have misfires.
Feb 5, 2017 at 10:01 PM