bradtopp

I've been dealing with rough idle for the last couple of months in my 2008 2-Door 6-speed JK. I'd notice it mostly when sitting at stoplights. The RPM needle would fluctuate just a TINY bit but most of the roughness was just felt in the driver's seat and the floor. Replaced the air filter and no change.

I changed spark plugs Saturday even though I only have 24,500 miles. Rough idle is completely gone and acceleration is smoother. I used the Bosch Platinum 2+ plugs which were on sale at AutoZone for $2.99.

The OEM Champion plugs looked a little whiter than I'm used to seeing. I normally like to see more of a smooth tan color on the tip but this isn't scientific and I'm not worried about it. I bought the Jeep used only 1500 miles ago so I have no idea how the previous owner treated it, etc.

edstroyer

Cool.... I heard one of those plugs is a bitch to get to, and out! Any advise?

bradtopp

My saving grace was I had a spark plug socket with a swivel head on it. You either need that or a swivel socket adapter. Otherwise there is no way to get to the plug on the passenger side nearest the fire wall unless you are a contortionist

Once you get that one done, the rest are cake.

Something like this ... not sure if this is the right size for the plug as I have several different sizes of these: http://www.sears.com/shc/s/p_10153_1...&blockType=G19

Bennny

I test drove many Jeeps, and they all (brand new) had the rough idle. Maybe it is the stock plugs...

ZoSo-Green

Good info! I was thinking about NGK, but fot that price I'll pick some up this weekend.

Mark

Here is some good reading material on the matter.

http://www.aa1car.com/library/sprkplg2.htm

sloppyjoe

I was able to push the front fender plastic out of the way to get a better grip on my hidden plug. Just go from inside the passenger side front fender pull it back enough to get your hand/wrench in and you should be good. JOE>

spartan99

I keep meaning to do this. I've always had the rough idle and I'm certain it's the plugs. Apparently lots of people's JK's have plugs aren't gapped correctly.