Ignition coils x300
Ignition coils x300
Author
Discussion

8Ace

Original Poster:

2,835 posts

224 months

Wednesday 9th January 2013
quotequote all
Thinking of treating the Jag to a new set of ignition coils in its next service - am I correct in assuming it's one per cylinder, ie 6 overall?

Depending on the make it could make it a bit pricey.

Jaguar steve

9,232 posts

236 months

Wednesday 9th January 2013
quotequote all
Yes the AJ16 has one per cylinder - but why do you want to do that?

entwistlecymru

202 posts

167 months

Wednesday 9th January 2013
quotequote all
Any particular reason you need all 6 doing? I've just bought an XJR and keep two as spares (as advised by the members of the Jag forums!) but unless they're making a light show under the cover, the new ones are staying in their boxes until needed!

.richard

74 posts

245 months

Wednesday 9th January 2013
quotequote all
Are you made of money? If no issues or misfires why change?

8Ace

Original Poster:

2,835 posts

224 months

Friday 11th January 2013
quotequote all
Thansk for the responses.

Replacing the coils were suggested for a few reasons - it's running a little rough at present and there's been an ongoing issue where it's hard to start if I leave it for a couple of weeks. It's getting fuel (the mixture is possibly a bit rich as I can smell it as it turns over) but I don't think it's getting spark. Once I've persuaded the damn thing to go, after lots of cranking, it will run rough (often suspect on <6 cyl) but thereafter is fine.

After 2 weeks without driving it at Christmas, it was harder to get going than usual and it's still not running perfectly. It's overdue a service, where I intend to get the plugs changed, but was thinking the coils could do with a refresh too. The car is at 155k and I'm unaware of any previous replacement.

Should I continue with the coils suggestion or is thetre something other I could do with looking at first?


Jaguar steve

9,232 posts

236 months

Friday 11th January 2013
quotequote all
Suggest you change the plugs first, then see if that makes any improvement. Whilst they are out check very carefully for any evidence of engine oil in the recess the coil pack sits in, and make sure all the coil pack connections are clean and brght.

Keep the plugs in cylinder order, line them up and look carefully at the tips once they are removed. They should all be a uniform very light grey or tan colour. Any notable variation from that colour range on an individual plug suggests a problem with that particular cylinder which needs further investigation

Coils do fail and nothing can be ruled out at that mileage, but plugs, especially if overdue are probrably the best place to start.

8Ace

Original Poster:

2,835 posts

224 months

Friday 11th January 2013
quotequote all
Sound advice - thank you.

Will look to replace coils if knackered but no call to do the lot.