I've heard of some confusion over cylinder numbering, are you sure you got No.5?

 

There have been several very comprehensive threads in this forum over the past three months that pertain to misfires in the S-Type V6 engine. Search "misfire issues" and you'll quickly find them. They will tell you that other potential fixes for misfires besides replacing a faulty coil or spark plug include doing a thorough cleaning of the fuel injection/induction system, replacing the two yellow-colored factory-installed intake manifold tuner O-rings (they tend to fail and begin leaking oil after a few years) with the new-and-improved green-colored O-rings, and possibly replacing the mass air flow sensor....

As you search this topic and read the threads that come up, pay particular attention to the information posted by the Jag tech with the screen name Brutal. He is well-versed on this issue and offers some great insight on how to potentially fix your misfire problem. If you've never done a fuel injection/induction cleaning, that may be your next step. And if your O-rings are indeed leaking oil, they need to be replaced....

So read the misfire threads, draw your own conclusions, and be sure to post here on what you decide to do as your next step to address this issue. By the way, the OBDII code for a cylinder 5 misfire is P0305. Is that the code that Autozone came up with when they read your car?

 

Jon is soooo right. As is djdex about the numbering

 

damn you guys have learned alot

 

Ongoing problems with a huge potential expense (burned-up catalytic converters) tend to cause me to ask a lot of questions and pay very careful attention to what the experts say. Just common sense and a fear of having a lot of money extracted from me and my checkbook....

 

DiaCero, yes it may well be cylinder 5 which is misfiring (we're not doubting that)..... but WHICH cylinder is numbered 5? The banks are 1 (or A) - which is on the right - and 2 (or B) - which is on the left. Bank 1 contains cylinder 1. So the others in that bank could be 2 & 3 or could be 3 & 5. Which did you decide? That's why you should read up on old posts about this.

 

Yeah that's what I was gettin at jagv8, Cylinder number 5 is the middle one on the LH bank, LH when you're sat in the drivers seat facing forward. I was thinking OP might have unintentionally got No.2 instead. That's often where things get confusing!

Numbering;

FRONT OF CAR

4 1
5 2
6 3

REAR OF CAR

 

Hello. i just bought my jag 1 month ago and the shop put in a new coil in cylinder 5 because they said it would idle funny. so a month later during the winter time i get a cylinder 5 misfire code and and a lean code with a restricted performance message in my message center and now it runs sluggish and idles up and down a little while parked and the car kinda wiggles from the misfire. did you guys figure out what made the the misfire happen.

Brand new part and happening again in same cylinder. hmmm?

I'd love the info you have to offer.

 

Did you pull a P0305 code? Are you sure the right cylinder's coil was changed out? Also, check the fuel injector connector on cyl #5 and if there was any oil on that old coil when it was change out then a gasket change on that side is in order. You may have fried the coil replacement if oil is leaking in that spark well.

Just my $0.02

 

Car details needed.

 

This is a well spent 2 cents.

 

well I figured it out. soon after year 2000 they changed the OE plug from platinum to iridium. So I had platinum plugs in there but all plugs were one prong platinum originals and the cylinder 5 had one of those bosch 4 prong plugs. all plugs were well over a tune up and the air filter looked like someone poured a pot of soil on it. so I believe it was that ockward plug mixed with the rest. now it runs fine. thanks for the help!