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2004 - 2008 Ford F150 General discussion on the 2004 - 2008 Ford F150 truck.

2005 5.4L Rough idle and chugging under load

 
Old 01-11-2017, 08:49 AM
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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.
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Old 01-27-2017, 08:48 AM
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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.
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Old 01-27-2017, 09:16 AM
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Nice !! Another satisfied customer.
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Old 01-27-2017, 09:24 AM
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Originally Posted by daveborg98 View Post
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.


Glad to hear that. Did you check it with a multimeter? What were the ohms? How did the boot look?
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Old 01-27-2017, 09:28 AM
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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.
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Old 01-27-2017, 09:41 AM
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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.
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Old 01-27-2017, 09:43 AM
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I replaced all boots and springs.

The rest of them were right at .8ohms so they should be good.
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Old 01-27-2017, 10:20 AM
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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!
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Old 01-27-2017, 10:27 AM
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Yes, i meant 1.8 ohms. 0.8 would have made for a truck that would not start.
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Old 01-27-2017, 11:35 AM
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Default 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 .
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