07 with cyl 6 misfire help

[mdec950]

2007 expedition - changed all the plugs with HT1 platinum and also changed the coil on cylinder 6 - i looked up that cyl 6 was the 2nd one from front of engine on driver side

pass driver
firewall
4 8
3 7
2 6 ****
1 5
grille of front

took off the fuel rail on driver side and did a professional cleaning of the injectors
1. with injectors off completely - filled each with seafoam
2 hooked battery charger to + and - nodes of the injector
3 at the same time used compressed air and made it all blow thru

yes you can use this idea as it works to really clean an injector
just bump the + on the battery charger to get it to open close open close

---- With all that said it still throws code that cyl 6 is misfiring
i also took a test light to the plug and it is pulsing a light off of 6

help - i need to get this inspected soon and it wont pass like this.

 

[Stoned06]

Swap the #6 coil with one from another cylinder and see if the code moves to the other cylinder. If so, the COP is bad (even new ones can be bad). If not, check the electrical connection to see if there are bad wires or a bad connector/clip.

 

[mdec950]

i took 5 and changed the coil on plug with 6 and 6 still throws code misfire.

the plug is good and tight

i checked it and there is 12 volt to it pulsing

what else could it be >?

 

[mdec950]

doesnt any one have an answer on this ?

07 expedtion with cyl 6 misfire
changed plugs
changed out all coil on plugs
took off fuel rails and cleaned all the fuel injectors
cleared code
and drove it
now says cyl 6 misfire again
checked compression on 6 and its the same as on 3

HELP please

 

[Richard Lewis]

probally a bad fuel injector itself move the injector from 6 to 5 and see if it follows it

 

[Richard Lewis]

Is that the only code your getting

 

[Richard Lewis]

they usually fail under load or with a little heat does it run good cold

 

[mdec950]

update for today

moved the cyl 6 fuel injector to 3
got the same code after clearing it
put in hi octane gas and also seafoam

it works until you get on it like from 40-75 mph

then it flashes check engine and goes out pending probably
and after 2-3 times it stays orange

i checked all im monitors and they all are ok
i have no incompletes

any other ideas ?

 

[mdec950]

only code is cyl 6 misfire
and it runs ok cold
when it gets warm and we get to 45+ mph it comes on

 

[Richard Lewis]

Sounds like a tricky one besides a intermitten wire failure to your cop or injector im thinking maybe debri in the fuel port were the injector goes into your intake did you try to put another sparkplug in number 6 ive had them bad from the package before.