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Cylinder 5 Misfire on cold start between 1000-1100 RPM's

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Cylinder 5 Misfire on cold start between 1000-1100 RPM's

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  #1  
Old 03-18-2018, 09:09 PM
ajschwab2004
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Cylinder 5 Misfire on cold start between 1000-1100 RPM's

I have a 2005 F150 5.4 3v, It's been sitting all day today till about 2 hours ago. I started it up for the first time today and as the idle was coming down from about 1500 RPM's, at about 1000-1100 RPM's trouble code came on. When I plugged in my scanner it said "cylinder #5 misfire detected" I checked the live data from the code and it was detected at 1043 RPM's. There was a rough idle for like 10 secs as the RPM's were dropping from 1500. Anyway, I let it warm up some before putting it in drive and driving it, and it drove fine. Anyone know what could be the cause?
 
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Old 03-18-2018, 10:07 PM
Ted928
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bad plug, poor plug seating, bad COP, ...

The best thing is to set up mode $6 monitoring so you can watch misfiring of all the plugs (prior to throwing a CEL).

This link may help https://www.ford-trucks.com/forums/1...-no-codes.html
 
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Old 03-19-2018, 11:37 AM
pdqford
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Or maybe you have an sticky fuel injector in #5. After it sets a while the injector may leak some fuel into #5 and when you go to start it, #5 may misfire until it clears out the excess fuel. Maybe.
 
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Old 03-24-2018, 08:19 AM
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humidy / moisture on a cracked coil cable ?
 
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Old 03-26-2018, 04:20 PM
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Well, it's been a week or so today that the misfired happened and after so far it hasn't happened since. What I'm thinking is change the plugs back to motorcraft for all 8 cylinders, change the COP, and fuel injector for #5 and see if it comes back again in the future.
 
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