the rear pass. side (near firewall under radiator tank) plug threads it was sticky and dark in color like mollassass but a little lighter and smelled of gasoline.

any ideas as to what this may be from? also what cylinder is this, i had a code pulled and it was a misfire #5 cyl. but we dunno if it was an old code cause there was no check engine light on so we cleared it out.

good news is my computer said i gained 4 MPG

_________________
2003 Renegade 4X4
3.7l
roof lightbar
front brush guard
everthing else is stock for now

That's what I would expect to see on a cylinder that was mis-firing. Fuel is getting injected, it's not firing, and it's cooking down to a sludge due to the heat of the engine.

Like I mentioned in the other thread you posted I would consider swapping the coil pack from the mis-firing cylinder up to an easy to get to cylinder (front drivers side). Run for a while, and pull the engine codes. If there is a code indicating a mis-fire on a different cylinder you have a bad coil. If there are no codes, I'd still pull the front drivers side plug and check to see if it's wet with fuel.

If there is a code with a different cylinder number, or the front drivers side plug is wet with fuel you know you have a bad coil. I don't know the cylinder numbers off the top of my head but it's safe to assume that the rear passenger (the one with the gummed up plug) is #5. It's also probably safe to assume if you move the coil pack from the rear passenger side cylinder to the front drivers side cylinder and you now get a misfire code on another cylinder (I'm guessing front driver side is #4) that it is your coil pack.

I don't remember the order either, and I can't picture the numbering scheme that would end up that way.

I DO remember several people reporting that there had been coil failures on cyl. no. 3 -- for some reason.

dkcase,

Of course your are right that wouldn't make sense for a V6. For some reason I was thinking of a V8. Brain fart I guess.

It's not too important though. Just move the coil pack and if the cylinder number changes on the misfire code, or the new plug the pack was moved to is wet with fuel you have a bad coil.

But if someone has the cylinder numbers handy, post them up!

Thanks!

From the Service Manual:

The 3.7 liter (226 CID) six-cylinder engine is an (sic)
90° single overhead camshaft engine. The cast iron
cylinder block is made up of two different components;
the first component is the cylinder bore and
upper block, the second component is the bedplate
that comprises the lower portion of the cylinder block
and houses the lower half of the crankshaft main
bearings.The cylinders are numbered from front to
rear with the left bank being numbered 1,3,and 5
and the right bank being numbered 2,4, and 6. The
firing order is 1–6–5–4–3–2. The engine serial number
is located at the right front side of the engine
block