HulluCorn

^ tareed and Lone - I agree with you.

I was in a pinch and didn't want to clog my brand new catalytic converter. Better performance and smoother idle was just a bonus.

The 45-55 jerk was starting to disturb me.. something had to give

Martian

I don't think that's true... the CEL should at least blink with a misfire, regardless of how many coils might be bad. If that was true, you'd have a code for more than one cylinder misfiring every time you had a misfire CEL, and that doesn't happen. But heyy I've been wrong before.

HulluCorn

I think the CEL only shows under certain conditions. I know that it should show if the coil has completely failed. After reading so many post on coils - i think anything is possible .

Lone Night Wolf

You will still have a code and if you have a code reader, the last digit of the code will tell you what coil it is but mine didn't throw a CEL.

connorfx4

Hmm. Interesting. I've never heard that one before.

Martian

Which part?

connorfx4

The last digit of the code will tell you what coil it is

Lone Night Wolf

These are the codes that will come up if one of the cylinders are misfiring

TOPGLOCK

I've never seen this before but it's definitely useful.

screamineagle

These trucks can and will misfire without triggering the CEL. Been there and done that on 2 of my F150s.