2005 5.4L Rough idle and chugging under load
#11
Moderator
That I can not answer for you. I suppose as long as the 02 sensor is within the defined range it may jump around a bit? Not sure though.
#12
I would just like to thank you guys for preventing me from spending money I did not need to. I found the coil on the #6 cylinder was not working right, so after replacing it all it well.
#13
Mark
iTrader: (1)
Nice !! Another satisfied customer.
#14
Moderator
Glad to hear that. Did you check it with a multimeter? What were the ohms? How did the boot look?
#15
It ohm'd out at .6 to .7 and the boot just had a small crack in it. I did replace the boot and spring before replacing the coil though. After changing those out, it still had the issue so I moved on to replacing it. I also noticed that is was different than the rest. It was more gray in color instead of black. I would image it was replaced at one point and the cheapest one put in.
#16
Moderator
Wow! Only .6 to .7 ohms! That was for sure bad LOL! I had a similar problem with #7 on my truck. It was also a grey colored coil. If that boot was cracked I would suspect others may be getting worn too.
#18
Moderator
You mean 1.8? Or did you have your multimeter set higher? Either way good on replacing all the boots and springs. Should be good to go for a while!
#20
05 5.4l 3v s.crew lariat
I'm glad the poster did not throw money at all coils .
StefanG-- is right, the oem coils don't go bad that often . Boots and springs as well as cleaning coils more likely fix. Of course if not installed right with dielectric grease and proper plug torque-- it can be for nothing . If boot gets damaged in anyway ,blowby ,gasoline ,oil etc-- change them . 50 ,000 volts or so will track easy and short out . Moisture can get inside boot if you don't use dielectric grease .
The short from a bad boot can destroy a coil after a while . Change them all when doing plugs .
Heat/ chemicals destroys rubber .
Everything on these plugs must be exactly correct or you can lose cats etc.
I worked high voltage up to 765,000 volts . The bucket truck booms are cleaned and coated with dielectric grease. The higher end volts are only worked hot with helicopters .
The short from a bad boot can destroy a coil after a while . Change them all when doing plugs .
Heat/ chemicals destroys rubber .
Everything on these plugs must be exactly correct or you can lose cats etc.
I worked high voltage up to 765,000 volts . The bucket truck booms are cleaned and coated with dielectric grease. The higher end volts are only worked hot with helicopters .