Which spark plugs should I use for XJ6 X300?
#1
Which spark plugs should I use for XJ6 X300?
It looks like R9YCC are no longer available, only R9YC. If I have to go with something other than what is recommended, I might as well look at something like NGK. Rumor has it, X300 is sensitive to spark plug resistance. Please feel free to share the plugs that you had good luck with.
Also, are R12YC's only for supercharged cars? Any advantage to fitting those.
Also, are R12YC's only for supercharged cars? Any advantage to fitting those.
#2
Here's the information I saved combining a TSB with a previous post on this topic:
__________________________________________________ _____________
05.1-07
Date
2-95
Amended 12/98
Model 1995-97 MY
Sedan (4.0l) Range
VIN 720001-812255
Spark plugs-AJ16 Engine-
Change in specificcation
ISSUE:
The spark plug specification is updated on all AJ16 (4.0L) Sedan Range vehicles to include supercharged engines.
Hotter spark plugs (part number EBC 8143) were installed on supercharged engines in production from 1997 MY.
ACTION:
Use the following spark plugs as service replacements in all AJ16 engines:
ENGINE PART NUMBER PLUG GAP TORQUE
AJ16 (4.0l) EBC 8143 0.9 mm (.035 in) 22-28 Nm (17-20 lb f
EBC 8143 = Champion RC12YC
__________________________________________________ ____________
I just changed from NGK to these exact Champions. Works perfectly, and they're inexpensive.
Note the word "ALL" in the TSB. So for all AJ16 engines, use Champion RC12YC plugs.
__________________________________________________ _____________
05.1-07
Date
2-95
Amended 12/98
Model 1995-97 MY
Sedan (4.0l) Range
VIN 720001-812255
Spark plugs-AJ16 Engine-
Change in specificcation
ISSUE:
The spark plug specification is updated on all AJ16 (4.0L) Sedan Range vehicles to include supercharged engines.
Hotter spark plugs (part number EBC 8143) were installed on supercharged engines in production from 1997 MY.
ACTION:
Use the following spark plugs as service replacements in all AJ16 engines:
ENGINE PART NUMBER PLUG GAP TORQUE
AJ16 (4.0l) EBC 8143 0.9 mm (.035 in) 22-28 Nm (17-20 lb f
EBC 8143 = Champion RC12YC
__________________________________________________ ____________
I just changed from NGK to these exact Champions. Works perfectly, and they're inexpensive.
Note the word "ALL" in the TSB. So for all AJ16 engines, use Champion RC12YC plugs.
The following 5 users liked this post by jvitez:
93SB (04-15-2018),
juha_teuvonnen (08-14-2014),
panagiotis (08-14-2014),
RJ237 (08-14-2014),
someguywithajag (08-04-2024)
#3
The following 4 users liked this post by motorcarman:
#7
There is a TSB on the 9s and 12s to be used , one for the N/A and the other for the S/C x300 series relating to the heat range below :
http://www.jagrepair.com/images/TSB/...6%20Engine.pdf
Any one have any experience or technical opinions on the 3 gap plugs ? Someone seems to have resolved his idle issue with them or if it may have been placing the O2 sensors connections correctly . Are the 3 prong a gimmick ?
http://www.jagrepair.com/images/TSB/...6%20Engine.pdf
Any one have any experience or technical opinions on the 3 gap plugs ? Someone seems to have resolved his idle issue with them or if it may have been placing the O2 sensors connections correctly . Are the 3 prong a gimmick ?
Trending Topics
#8
*shrug* .... unscientifically, my observations in various reading hadn't been favorable for these multi prong/ground plugs.
Some good overall info for our plugs:
https://www.jaguarforums.com/forum/x...stions-178062/
...and:
https://www.jaguarforums.com/forum/x...-plugs-121820/
The Champion RC12YC plugs are about $2 at any auto parts store or even Walmart, so it's hard for me to get too excited about putting a lot of additional research into spark plug choice. What's really humorous is that the RC12YC is normally found in the "garden tractor" section of the store, not automotive!
I just change them every year, especially since it is so easy to do on the AJ16
.
Some good overall info for our plugs:
https://www.jaguarforums.com/forum/x...stions-178062/
...and:
https://www.jaguarforums.com/forum/x...-plugs-121820/
The Champion RC12YC plugs are about $2 at any auto parts store or even Walmart, so it's hard for me to get too excited about putting a lot of additional research into spark plug choice. What's really humorous is that the RC12YC is normally found in the "garden tractor" section of the store, not automotive!
I just change them every year, especially since it is so easy to do on the AJ16
.
The following 3 users liked this post by al_roethlisberger:
#10
I *guess* so, as they don't say which Champion they are, but they are probably correct if they are being sold as a genuine Jaguar part. Not a bad price BTW.
But I just get mine from Autozone or Walmart
.
The following users liked this post:
xjfourty (04-03-2018)
#11
Join Date: Feb 2014
Location: Crossroads of America
Posts: 19,648
Received 13,399 Likes
on
6,606 Posts
seems like there re at last 2 versions, one nickel and the other copper.
Would this one be okay sold on Amazon ?
https://www.amazon.com/Champion-RC12.../dp/B000CFME2A
Would this one be okay sold on Amazon ?
https://www.amazon.com/Champion-RC12.../dp/B000CFME2A
Assuming you are inquiring about spark plugs for an X300 with the AJ16 engine, the Champion RC12YC plugs are $1.36 each at Rock Auto, plus shipping, but as Al says, you can find them locally for low prices, and the general consensus is that they are the best plug for an AJ16 and plenty of problems have been reported by owners who tried other plugs.
If you are asking about a different Jaguar model and engine, that will make a difference in the plug you should use.
Cheers,
Don
The following users liked this post:
93SB (04-06-2018)
#12
Join Date: Feb 2014
Location: Crossroads of America
Posts: 19,648
Received 13,399 Likes
on
6,606 Posts
Cheers,
Don
Last edited by Don B; 04-04-2018 at 09:42 AM.
The following 2 users liked this post by Don B:
93SB (04-06-2018),
Lady Penelope (04-03-2018)
#13
yes X300 AJ16 engine.
I sold my series III one month ago...
I sold my series III one month ago...
Hi xjfourty,
Assuming you are inquiring about spark plugs for an X300 with the AJ16 engine, the Champion RC12YC plugs are $1.36 each at Rock Auto, plus shipping, but as Al says, you can find them locally for low prices, and the general consensus is that they are the best plug for an AJ16 and plenty of problems have been reported by owners who tried other plugs.
If you are asking about a different Jaguar model and engine, that will make a difference in the plug you should use.
Cheers,
Don
Assuming you are inquiring about spark plugs for an X300 with the AJ16 engine, the Champion RC12YC plugs are $1.36 each at Rock Auto, plus shipping, but as Al says, you can find them locally for low prices, and the general consensus is that they are the best plug for an AJ16 and plenty of problems have been reported by owners who tried other plugs.
If you are asking about a different Jaguar model and engine, that will make a difference in the plug you should use.
Cheers,
Don
The following users liked this post:
Don B (04-04-2018)
#14
Adding to Lady P. comments I had bought the recommended spark plug and my car ran like $#!+. I tried 3 different branded spark plug, made sure they were correctly gapped with no luck.. I purchased the 3 prong plugs and ran beautifully. Now my problem may be unique, however the O2 sensor issue was later down the road when I cleaned them and connected them to wrong harness. Anyways I plan on trying different plugs later down the road and see if there is a difference.
The following 2 users liked this post by jacklynthejag:
Don B (04-05-2018),
Lady Penelope (04-05-2018)
#15
Thread
Thread Starter
Forum
Replies
Last Post
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)