2004 Lincoln navigator missfire cylinder #8 under load 40 mph... 1900rpm

i found water on coil #8 i swap the coil problem continues .... i resently replaced spark plugs..... problem started after a trip to a car wash.... it misfires more under load... 02 sensor drop lean whe misfire happens.... the feels thant it has no power to accelerate..it ..shakes
P0308
p0174


any help thank you:whistle:

Your double posted on this. I'm sure someone will delete one of them.

P0308 - Did you dry out the water in the spark plug tube? Do you have spark from the #8 coil? Coil & injector control? Tell us what your missing & we can guide you further/farther.

P0174 - Possible vacuum leak, maybe an intake gasket?

O2 sensor is normal when the misfire isn't acting up?

You have to get the misfire fixed first.

yes i dried the #8 tube coil...

Rabbit wrote: yes i dried the #8 tube coil...

OK...

Do you have spark from that coil?

Coil control?

Injector control?

Let us know & we will try to help

i just checked for spark.... i found coolant in the #8 coil ...it was not water.... i guess it needs a head gasket.... thanks so much for the help

Rabbit wrote: i just checked for spark.... i found coolant in the #8 coil ...it was not water.... i guess it needs a head gasket.... thanks so much for the help

Coolant in the spark plug tube? What's the 8th digit of the VIN? I ask because if it uses a plastic intake plenum, then it's WAY more likely that the intake itself is cracked and leaking coolant into the plug tubes. Happens all the time.

Tyler wrote:

Rabbit wrote: i just checked for spark.... i found coolant in the #8 coil ...it was not water.... i guess it needs a head gasket.... thanks so much for the help

Coolant in the spark plug tube? What's the 8th digit of the VIN? I ask because if it uses a plastic intake plenum, then it's WAY more likely that the intake itself is cracked and leaking coolant into the plug tubes. Happens all the time.

Agreed. Intake gasket or the intake itself. Head gasket couldn't get into the spark plug tube. Only other option would be a weirdly cracked cylinder head. You should be able to clean up the area & pressure test the cooling system. Problem should be obvious.

vin:last eight digits 4LJ21422

the 8th digit the vin iis "R"