5.0L Owners Check Your Plugs!
07-27-2015, 05:40 AM
#1
Senior Member
Thread Starter
5.0L Owners Check Your Plugs!
This past weekend I decided to check and regap my plugs. I started noticing a little bit of a rough idle at times.
From my findings Ford recommends .041-.047 for the 11-12 5.0Ls but changed the required gapping to .049-.053 on the 13-15s. My tuner suggested I run .045 so that's what I went to.
The stock gapping was WAY off even from factory specs. Here's what they were!
After recapping them to .045 the idle has improved greatly and the slight bog/drone I would get when accelerating but not downshifting has greatly improved as well.
BTW I regapped the existing plugs I did not install new ones. They currently have 36,1XX miles on them.
Wayne
From my findings Ford recommends .041-.047 for the 11-12 5.0Ls but changed the required gapping to .049-.053 on the 13-15s. My tuner suggested I run .045 so that's what I went to.
The stock gapping was WAY off even from factory specs. Here's what they were!
After recapping them to .045 the idle has improved greatly and the slight bog/drone I would get when accelerating but not downshifting has greatly improved as well.
BTW I regapped the existing plugs I did not install new ones. They currently have 36,1XX miles on them.
Wayne
07-27-2015, 09:46 AM
#2
Senior Member
interesting - given it's an item most owners will never personally check I guess the factory doesn't put much effort into it
'nother project to do now, curious if mine are off too
'nother project to do now, curious if mine are off too
07-27-2015, 10:00 AM
#3
Senior Member
5.0L Owners Check Your Plugs!
I also had the same issue with my plug gap. Instead of re-gapping the old I replaced mine at 49k, but luckily I did cause this is what I saw. Oil all over the plug, but none on the iridium.
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01silverbullet (07-29-2015)
07-27-2015, 07:51 PM
#5
Been meaning to check mine, having an early 11' they are known to have gapping problems.
07-27-2015, 09:01 PM
#6
Senior Member
after 36k miles they would have been burnt down opening the gap. if I went to the trouble of checking them, I would replace with new. did you put anti-seize on the threads? changed my wife's car today, Ford Flex with 112k miles and the plugs were over .80 suppose to be between .52-.56 gas mileage had been suffering, tranny shifted weird, acted like it was slipping but rpm's stayed the same. sluggish taking off, now it runs and drives like new. I had to pull the intake manifold to replace the back 3 plugs. took about 1.5 hours, easy to do, had been dreading it is why I waited so long.
07-27-2015, 09:55 PM
#7
Senior Member
after 36k miles they would have been burnt down opening the gap. if I went to the trouble of checking them, I would replace with new. did you put anti-seize on the threads? changed my wife's car today, Ford Flex with 112k miles and the plugs were over .80 suppose to be between .52-.56 gas mileage had been suffering, tranny shifted weird, acted like it was slipping but rpm's stayed the same. sluggish taking off, now it runs and drives like new. I had to pull the intake manifold to replace the back 3 plugs. took about 1.5 hours, easy to do, had been dreading it is why I waited so long.
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07-27-2015, 09:59 PM
#8
Sub'd
I've been planning on checking mine.
I've been planning on checking mine.
07-27-2015, 10:32 PM
#9
Senior Member
you do not have too with the new plugs but according to Ford mechanic they still put a very light coat on. been doing it this way ever since I had aluminum heads on my vehicles. this was not my truck but wife's 3.5 V6 Flex.