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Old 05-11-2009, 10:32 PM   #1
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Default ignition coils bad?
I think my coil may be heading south but i have no check engine light. most people i talk to say it will trip a light...i have ruled out most everything alse and really think its a coil but have no check engine light and no codes at all. could it still be a coil? this is for a 03 SCrew 5.4 auto

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Old 05-11-2009, 10:38 PM   #2
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I think my coil may be heading south but i have no check engine light. most people i talk to say it will trip a light...i have ruled out most everything alse and really think its a coil but have no check engine light and no codes at all. could it still be a coil? this is for a 03 SCrew 5.4 auto


What symptoms are you experiencing?
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Old 05-12-2009, 03:18 PM   #3
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i replaced mine because i had bad acceleration without it throwing any codes, also replaced the spark plugs and it made a world of difference.. coils i got $100 for a set of 8 off ebay...
stephen
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Old 05-12-2009, 04:58 PM   #4
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it is missing...usally when driving along at lower rpm it will start spuddering as you lay into the throtle as soon as it drops down a gear the spuddering goes away. also sometimes it feels like the engine is surging when climbing hills.
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Old 05-13-2009, 12:08 PM   #5
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it is missing...usally when driving along at lower rpm it will start spuddering as you lay into the throtle as soon as it drops down a gear the spuddering goes away. also sometimes it feels like the engine is surging when climbing hills.
I have some of the same issues. im replacing plugs as soon as i have time in my final schedual. i would be intersted to find out if the coil packs help as well.
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Old 05-14-2009, 01:41 AM   #6
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so you say it misses only under a load? rough idle could also be a vaccum line thats leaking
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