Hey folks, could use a little help with my xjr6..took it to a specialist shop and found out that my engine was misfiring and it has 2 coil packs that went bad. They recommended perhaps replacing the whole set only problem is they want close to 450$ Each! Thinking bout replacing spark plugs(champions)as well but do they usually cost 25 bucks each? Geez.. is there perhaps any good/tested aftermarket coil packs out there? Cheaper pricing spark plugs? How bout used ones? Im thinking checking out Jaguar Heaven out in stocktom,caAny advice/help would be appreciated

 

While there are wealthy purists who post here, and have recommended changing all of the coils. That seems foolish on a 15 year old car. Change the ones that are bad, and MAYBE get a spare for the trunk.
To drive a car as old as an XJ6, maybe you should consider doing some of the work yourself. This car is extremely easy to work on, (well, except for the fuel pump or the starter), and DIY can save you a bundle. The shop, no doubt, simply read the codes to determine which coils were bad. Or they just swapped them around.
I do not know where yiou got your Champions priced, but that is way too high. Cjeck the archives for good plug recommendations.

 

Coil pricing is all over the board...and apparently so is quality.

You can buy high quality brand name and/or OEM coils for about $150-200 each on line....or for as little as about $60 each for no-name coils from Beck Arnley. There is some question as to longevity of the brand-x type but some of us are budget-limited these days and take our chances.

A few months ago I had some problems and identified two bad coils and replaced them. A couple months later the symptoms returned and I found two (or was it three?) more faulty coils...and went ahead and replaced all four. That scenario isn't unheard of which is why some suggest summarily replacing all six at once. Personally, I wouldn't replace all six just because two are known faulty.

Your Jag is happy with garden variety Champions for $2.00 each.

Replacing the coils and plugs is easy on your car. If you have even modest DIY skills you can save a ton of money. Post back if you want some instructions.

Cheers
DD

 

Yes...instructions would be helpful..have a preety good idea where its located but im hoping i dont need any special tools. Anyeays, im more worried about picking the correct model oem or aftermarket coil packs and right type of champion spark plugs.....as i dont want to have any problems buying parts online and end up finding i bought the wrong parts and go through that hassle. any specific ones i should look out for? Any good reliable websites that sells these
items? Many thanks in advance for the help folks!

 

Rock Auto has the on-plug coils listed for less than $60.00 EACH

bob gauff

 

I'm having the same problem with my XJ6 so I'm going to stick around this thread and see what Doug says about "how to do it" since I'm so confused. Just starting to be a DYI on the engine of my car.

As for the pricing on the plugs, Part Source should carry them, I bought 6 for my car, $17 for all 6 of them.

However I opened the hood of my car and realized I had no idea how to install them.

 

On the top of the cam cover is a removable panel. it says "Jaguar" and is held in place with three torx head screws. Remove this cover and you'll see the six coils.

The coils are held in with one bolt each...8mm socket, I think. Remove the bolt and gently unclip the wiring connector. Then pull the coil straight up and out. A bit of wiggling might be needed....wiggle the coils, that is, not your body. You'll now be able to see and remove the spark plugs.

Each coil has a gasket. These break easily when removing the coil. The Beck Arnley coild from Rock Auto come with new gaskets...perhaps other do as well.

I spray the inside of the coil boots with a bit of silicone to ease the fit over the spark plugs on installation.

That's really all there is to it. Don't overtighten any of the fasteners. Snug is tight and tight is broken.

Cheers
DD

 

Hi. I recommend British Parts UK, for they have coils made in Japan, which means they are exactly the same as original but only lack genuine lucas stickers on them.


>That scenario isn't unheard of which is why some suggest summarily replacing all six at once.

I once talked about this with my mechanic friend.
It is very simple; when one coil dies, the all other coils that were born on the same period will have their days numbered.
What is important is, when they nearly die, they have weak spark. So when you replace some of them with new ones, that ends up in inharmonic idling.

Of course there will be no problem functionally, but the statement above is the reason they usually recommend the replacement of all coils.

 

Hi. I recommend British Parts UK, for they have coils made in Japan, which means they are exactly the same as original but only lack genuine lucas stickers on them.


>That scenario isn't unheard of which is why some suggest summarily replacing all six at once.

I once talked about this with my mechanic friend.
It is very simple; when one coil dies, the all other coils that were born on the same period will have their days numbered.
What is important is, when they nearly die, they have weak spark. So when you replace some of them with new ones, that ends up in inharmonic idling.

Of course there will be no problem functionally, but the statement above is the reason they usually recommend the replacement of all coils.

 

Beck Arnley coils do come with the gasket which is a plus. I recently needed 2 and found them to be manufactured in Japan like the originals for this cat. They have black sealant on the top but if you look closely you will see the outline of the rectangular cap in the sealant - also like the originals. A good search engine is thefind.com, you may also search amazon as their a little bit safer to buy from in some cases.

 

Ok great advices for the coils so far..just a little confused with spark plugs now..checked out rock auto and they had tons of them and i wasnt too sure which ones to get. Any specific champion models? (xjr6 95) They all seemed decent prices especially if youre trying to work with a budget. Thanks for the tips.

 

Champion RC9YC

Jaguar later recomended RC12YC for the six cylinder cars but I can't remember if the recomendations included the XJR/6.

Someone will clarify. I haven't had my coffee yet :-)

Cheers
DD

 

I have talked with several owners around this point and only 1 person I know changed all 6 coils at once. These things either work or don't work, if the spark is weak you will get the check engine light and the coil will be done in a few days.

I have had this happen twice, once 3 years ago and my long term Jag specialist shop used a $ 430 part. Coil failure only happened once more 2 months ago and my new shop found a $ 160 OEM part.

Since I am not the original owner, I don't know for sure how many other coils were changed. The first time this problem happened the coils all looked to be the same. Now I have 2 different replacements, 4 originals and the car runs fine.

I would think it would be wise to carry a spare, but don't see the need to change all 6 coils at once. If it's not broken, don't fix it.

 

FWIW, although a faulty coil won't heal itself I think a gradual degradation is possible.
When I had coil problems there was no check engine light and the only symptom was roughness below 1200 rpm....which existed for weeks before I replaced them. I'm not sure how long it would've taken for the coils to fail entirely.





I agree that all six needn't be summarily replaced. OTOH don't be too surprsed if you have several failed coils in a fairly short period of time.

Cheers
DD

 

Coils on the x300 (really all models but more on the x300) on mine ive had coils misfiring alot and could feel at idle and acceleration onto freeway. Only 1 time in the last 10yrs ive owned the car did it ever through a misfire code and that was for a dead coil. Never for the ones you could feel, they just didnt get severe enough. But the #1 killer of catalytic convertors is misfiring/rich fuel mix. Go price a set of cats for these cars and tell me again its foolish to not change all 6
Everytime they dont fire the fuel that fuel goes into the cat overheats it and reduces its efficency. do this enough and eventually youll be seeing p0430, p0420 cat inefficiency codes

 

What do you mean by misfiring a lot, did you change all 6 coils every time?

I have only had it happen twice in 4 years. The last time was a couple months ago. As soon as I felt the slightest bit of roughness at idle however, I had it checked.

The first time it happened the coils were over $ 400 each, so replacing all 6 didn't seem logical at that time. There were no other issues for over 4 years.

I know what you are saying about ruining the converters, at least now you can get replacement coils online for $60 each so you could make a case to replace all 6.

How many times have you changed all 6 coils at once?

 

I wouldnt at $350-400. its just not realistic. But when the cars were newer. the coils were cheaper.. Now you can find them cheap again and my referance is that coils misfire alot without setting a check engine light. This makes it very hard to diag which 1 or 2 to replace. some jags you can see the misfires without a ck engine light with a misfire counter. Stypes are the most common that can be done, and it is not uncommon to see 6-9 thousand misfires on just 1 cylinder and NO CEL. My point is this. Over the years I have seen customer let misfires go and not take care of them promptly and then ended up with bad cats. ALOT more money later than sooner. My ex even called me tonught and wants a tuneup and coils on her Volvo cause she feels misfires and in her words "Ive already learned not to let it go and toast cats, so please do this tommorrow for me

 

Hi Guys,

Newbe here and a very new XJR6 owner. It seems that there is a bit of a concern for the Catalytic Converter if the coils are bad. Do all XJR's have cats? Mine is an import from Japan and is a 1995.

I've been driving the new Jag on the highway and it seems to run a bit rough at some RPM's / speeds. I can't say for sure it is ignition or trany or the obvious front end stuff but would bad coil (s) cause some vibration or shuddering at diferent speeds under load?

Thanks,
Chris

 

Doug says...


@ Canadian_XJ6,

Keep in mind that CarQuest is very inexpensive for the majority of replacement parts for our cars and usually in stock. I recently bought (2) fuel filters, (2) Dorman oil pan drain plugs & washers, a Wix oil filter and a Mann air filter for $35 Canadian.