Cylinder 5 Misfire on cold start between 1000-1100 RPM's - Ford Truck Enthusiasts Forums

Go Back  Ford Truck Enthusiasts Forums > Newer Light Duty Trucks > 2004 - 2008 F150
Reload this Page > Cylinder 5 Misfire on cold start between 1000-1100 RPM's
Notices
2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 engine

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

Reply

 
 
 
  #1  
Old 03-18-2018, 09:09 PM
ajschwab2004
ajschwab2004 is offline
New User
Thread Starter
Join Date: Aug 2015
Posts: 7
ajschwab2004 is starting off with a positive reputation.
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?
 
Reply With Quote
  #2  
Old 03-18-2018, 10:07 PM
Ted928
Ted928 is offline
Senior User
Join Date: Sep 2005
Location: Charlton, NY
Posts: 308
Ted928 is starting off with a positive reputation.
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
 
Reply With Quote
  #3  
Old 03-19-2018, 11:37 AM
pdqford
pdqford is offline
Postmaster
Join Date: Jan 2001
Location: Central NYS
Posts: 2,966
pdqford has a good reputation on FTE.pdqford has a good reputation on FTE.pdqford has a good reputation on FTE.
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.
 
Reply With Quote
  #4  
Old 03-24-2018, 08:19 AM
steve(ill)'s Avatar
steve(ill)
steve(ill) is offline
Post Fiend
Join Date: Jul 2005
Posts: 9,342
steve(ill) has a great reputation on FTE.steve(ill) has a great reputation on FTE.steve(ill) has a great reputation on FTE.steve(ill) has a great reputation on FTE.steve(ill) has a great reputation on FTE.
humidy / moisture on a cracked coil cable ?
 
Reply With Quote
  #5  
Old 03-26-2018, 04:20 PM
ajschwab2004
ajschwab2004 is offline
New User
Thread Starter
Join Date: Aug 2015
Posts: 7
ajschwab2004 is starting off with a positive reputation.
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.
 
Reply With Quote
 
 
 


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.