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04 BMW x5 4.4i Missfire cyl 5 only if warmed up at idle 04 BMW x5 4.4i Missfire cyl 5 only if warmed up at idle
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Old 02-04-2019, 04:03 PM
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04 BMW x5 4.4i Missfire cyl 5 only if warmed up at idle
So as I said in the title I have an 04 BMW X5 4.4i that when I warm it up it develops a misfire in cylinder #5/ check sum failure. If i get in it and just start driving there is no issues. Coil packs and spark plugs have been replaced a few moths back and I cleaned the mass airflow sensor. Anything else someone can think of that would cause this?
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Old 02-04-2019, 06:07 PM
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Swap the coil from #5 to #4. See if the fault follows the coil.

Wouldn't be the first time a coil pack was DOA.
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Old 02-04-2019, 08:39 PM
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What brand of could? Plugs?
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