No. 4 cylinder

[Willshooter3]

Having a bit of problem, had a bunch of engine codes on an 06 XLT. Got everything cleared, down to a 0304, replaced the coil pack... still have 0304 code, still have a miss, truck runs like crap-misses; and the engine light is flashing.

 

[Habbibie]

Change the spark plug!

good luck though, that's the hardest plug to reach.

 

[Willshooter3]

Yeah. That coil pack was lovely.

 

[Bedrck47]

You only mention replacing the coil pack.

Did you replace the plug and boot?

Did you check the wiring connector and check the wiring back to the PCM?

 

[Willshooter3]

Didn't replace the plug.
Boot?

 

[Bedrck47]

Nothing like only doing job half way OR HALF A$$ED Had that problem once in the past turned out to be a pin hole burn in the boot

BOOT? The rubber part that contains the spring wire that connects the coil to the spark plug

 

[Willshooter3]

That was all new. With the new coil pack. All in one. Only thing I didn't replace was plug.

 

[Bedrck47]

Well sometimes people just buy a coil and some coils come with the boot and some don't

But I have a hard time trying to figure out why someone that is getting a misfire code would only change the coil and not the spark plug.

How many miles on the expy?
And when was the last time ALL the plugs were changed??

 

[Willshooter3]

250K... last time they were changed was 100K... dealer serviced it... Yeah. I dunno. Maybe I was in a hurry. A big hurry and trying to get it fixed in a hurry.

 

[Bedrck47]

Sounds like its long past the time for ALL the plugs to be changed 100k on the firs set yet 150k on the second set and haven't been changed yet I can imagine what the gap on the plugs looks like

 

[Willshooter3]

Yeah. kinda thinking the same. Dreading doing it.

 

[Habbibie]

Didn't replace the plugs

My expression can not be put into words.

 

[1969 Bulldog]

Found a qualified mechanic on craigslist out on his own. Changed all the plugs & coils for $125 labor in a surprisingly short amount of time. Definitely worth it to me.