Its missing badly, I bet. I doubt its firing out of sequence since the length
of the wire on the coils would make it very hard to put them back on the wrong
cyls, but its something to doublecheck.
You need to figure out which cylinder is missing. Easier with non-coil-on-plug
where you just pull/replace the wire off each plug while running until you
find the one that doesn't make it worse when off.
Not sure how I'd recommend you do it with the COP design.
I would double check that all the coil wires are going to the nearest coil.
Also, you may have stressed the wires going into the coils and broken the
conductor in the insulation. Look for wires that bend too easily a certain
point.
Last of all, make sure one or more of the plugs aren't shorting; Make sure
they all have a gap (the correct gap) and that none have gotten mashed such
that there is no spark gap.
Thats all I can think of.
I doubt its the computer.
Marty
Sean Bruckman wrote:
> I changed the sparkplugs in my truck from some nearly fouled regular Bosch
> copper plugs to Bosch Platinum +4's.
>
> Immediately after starting the idle is steady but the whole truck vibrates
> much more than normal and you can hear the vibration in the sound of the
> engine and exhaust. It's not necessarily bad sounding, but waaaay different.
>
> It seems to be drivable and the trouble code is for the following: Idle
> Control System Malfunction
>
> What does this mean? Could it be a plug not seated properly, or maybe i
> inadvertantly dropped something into a cylinder or what? (those were my only
> thoughts)
>
> I have the 4.7 with coil on plug... all the coils are seated properly as
> well as the clip-in coil wires. I pulled two plugs and reseated them and
> they looked fine. Is my computer just weirded out by the big difference in
> plugs?
>
> Sean
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