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Engine missfire

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Old Jan 26, 2011 | 09:58 PM
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brentaleclaire's Avatar
brentaleclaire
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Engine missfire

I recently developed an engine miss on my 99 super duty with a 5.4 liter engine.No check engine engine lights came on, but I was able to pick up a code using a portable scan tool. The scanner showed a miss on#8 cylinder.I removed the old plug ,which didn't look bad. I put a new plug and coil pack in,but still have the miss.I pulled the coil wire and hooked to a new plug and grounded it,and could see a good spark. Could the scan tool be giving me the wrong code or cylinder?
 
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Old Jan 26, 2011 | 10:36 PM
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superdutybob2122's Avatar
superdutybob2122
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On my 5.4 I've had the engine miss one time but had two bad coil packs, #6 and #8. I would try #6 next and if that doesn't work keep roatating coils until you find it
 
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