No, but you will loose a little bit of coolant. Simply just topoff with distilled water.

Make sure you replace the $6.00ish IMT O-rings since you will have easy access at them with the intake off.

 

Holy Crap! I got 3 different answers from parts stores and even dealerships on replacement plugs. An independent shop, Motorcars LTD recommended Motorcraft plugs. The dealership recommended NGK TR6AP13E. BAP autoparts gave me a set of TR6GP plugs. WTF??? I wonder if the differences between any of these are noticeable. I think the the highest risk part of this job is the gaskets, not the plugs, but I have heard that non OEM plugs can set off codes. True?

I think that I making this more complicated than it is.

The IMT O-rings from the dealer were $22.00 total. Bought them plus an aftermarket set to compare. The aftermarket set appears to be more rigid and less porus. The aftermarket set ended up costing about $3.74.

I am glsd that this only happens about every 85,000 miles or so.

 

Just get the iridium plugs, doesn't much matter what make they are.

Gaskets sets go aftermarket Fel-Pro makes great ones and I have used them in 2 different 3.0 S Types.

Whoa..$22.00 for IMT O-rings....dude you got peeled like a banana! Should have been 3 dollars and change for each from a dealer. Aftermarket IMT O-rings where did you find them?

Just make sure when changing your plugs you have JTIS or alldatadiy for step by step instructions and all torque values.

 

I did find aftermarket O-rings from Motorcars LTD.

I just may use those and return the green ones to the dealer. They appear to be the same size, just different materials. I dunno.

As far as the plugs go, why is iridium better than platinum? Will it make a difference? I think that I bought platinum NGKs.

Argh, this is hard.

I might be in trouble as I don't have that JTIS thing. Its a ******* to install on the computer. I could never get it installed.

 

Hmm I don't recall Motorcars carry aftermarket IMT O-rings. I will check that out.

Platinum verses Iridiums: https://www.jaguarforums.com/forum/s...archid=1288017

www.alldatadiy.com is $25.00 and very easy navigation for a one year subscribtion. I went with the 5 year plan.

 

Interesting, I found them on MotorcarsLTD website, they are listed as .84 cents each.

Intake Valve O-Ring - C2S40669

 

Dennis, any update?

 

Iridium plugs last longer as the tip is more resistant to burn down with the arcing I believe

 

I am going back to the dealer and returning their so-called OEM plugs - which aren't, and along with it return my $22.00 set of O-rings. Outrageous.

I am done with that dealer.

 

I am going to install my plugs maybe this weekend or next. I decided on NGK Iridium TR55IX plugs which I won't have to regap. I am sure that I could have put OEM plugs in and been fine, but I thought I'd give them the try. I hope to see some benefit from purchasing these plugs. We'll see. I'll let you all know when I put them in.

Henry

 

Had to abort the spark plug mission. Had a lot of things removed. I went to check a random plug on the left hand bank of cylinders (cylinder #6). It had oil surrounding the upper part of the plug. Electrode was dry. Does that mean that I need to replace the valve cover gaskets and spark plug seals as well?

I have heard two different answers on that.

I can see why Jaguar recommends every 100,000 miles for plug replacement. Even doctors would be declaring bankruptcy if they had to tend to this stuff. Of course, doctors don't own older Jags.

 

Henry, as I have posted in any of the 3.0 spark plug change threads (this one included see post #2). Its good to have a set of Fel-Pro valve cover gaskets (seals) on hand when changing the spark plugs! 9 out of 10 times, the DIYer will find that the spark plug wells will have oil in them due to a failing gasket (seal).

One can always return a cheap set of valve cover gaskets if not needed!

 

Yep. I messed up. I will conclude this exercise around the Christmas holiday when I get some more time off. I appreciate the tips and insight I get from this forum. It makes owning a Jag a lot easier.

I am also going to purchase an extra set of radiator hoses from NAPA, which are half of the dealer price, and a pressure tester when I get the cash. I don't ever want to be stuck with a $1000.00 bill to change radiator hoses again. Having removed many of the items around, you can see how things fit together. It's bad, but not impossible.

 

It's 70,000 for the 3.0 (and 2.5).

 

My 2005 owners manual specifies a 100,000-mile spark plug change interval for the 3.0. I believe that assumes your vehicle was factory-equipped with iridium plugs....

 

I think they're all iridium on 2003+ cars.

I don't understand how yours can say 100,000 - the current sheets on TOPIx appear to be solidly 70,000 for V6. Maybe they found wear or breakdown or something and reduced it to 70,000? Or it was simply a misprint that yours shows 100,000 (which is the V8).

 

JagV8, I am with Jon89 on this one. Our 2005 3.0 owners manual also states a spark plug change at 100,000 miles, nothing is noted to replacing at any service interval prior to that.

 

Oh sure, I believe your books say that - I'm not saying you can't read or the like! - but I don't understand why Jaguar have apparently messed around. The original maintenance sheets say 70K and the revised sheets (dated 2006 and covering your car, indeed all the 3.0 cars) also say 70K. Apparently only the handbook you refer to says 100K. I've not seen 100K for the 3.0 engine anywhere else so am very doubtful it's right (I guess they thought it was right when they had them printed, or the tech author made a mistake).

Whatever the case, jag have really screwed up the documents

I wonder what the jag techs reckon?

 

Frankly, my experience with iridium plugs tells me that a 100,000-mile change interval is, in most cases, too soon. The Denso and NGK iridium plugs that I've had in the past can easily do 150,000 miles or more if the vehicle is well-maintained and not abused. The Denso iridium plugs in my wife's Lexus SUV are approaching 119,000 miles and still look and perform as if they were new. I fully expect to get 150,000 miles or more out of them....

The iridium plugs in our S-Type are Motorcraft, however. It remains to be seen if they can reach similar lifespans that the Denso and NGK iridium plugs do. But at just over 66,000 miles now, they continue to look new and perform well....

 

Even odder, as the iridiums that I know were fitted are Denso. I never heard of any being Motorcraft. Curioser and curioser