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I decided to replace all my old coils recently for preventative maintenance and also a smoother idle. My car is a 96 with about 98000 miles and some of the old coils had black tracks inside the valve covers, suggesting spark jumping.
I have read a lot about the original Japanese coils and the Chinese knock offs on this Forum. The consensus seems to be Japanese good, Chinese not so durable.
After checking out multiple sources I decided to buy a QYL 6 pack from Amazon. Cost was $72.00 and as an added bonus they each came with a new gasket. I was pleasantly surprised with the visual quality (very clean molding as good as the originals) The spring and the rod under the boot actually IMHO better than the originals.
I also weighed the new coil over the original and the QYL coil actually weighs 8 grams more,I don't know if this is significant. Time will tell if these Chinese coils hold up but with the new coils and Champion plugs it is smoother.
QYL makes coils for many vehicles and the reviews were mostly positive.Of the generic coils available this seems to be one of the better ones.
Any updates after 1-1/2 years using the QYL coils? I just ordered a pack as my Japo Lucas appear aged (one has fractures down the sides and another a torn boot at the plug). Also, is it typical that they behave differently (worse) after the car warms up? I have no codes other than a p0303 once, so I am expecting the coils will be the issue. I have put 30,000 miles on the car so far over 1-1/2 years, and they were obviously not new when I got it.
The QYL coils I installed back in June of 2017 are still working fine, no problems. One thing I did do was make sure I coated the inside of the rubber boot with dielectric grease. Most of the coils I replaced had cracks running down the side of the coils and it was obvious that spark had been jumping to the cam cover. I had mentioned before that the coil on plug system is in a very hot location, the older system with an individual coil was normally in a colder air position not on top of the engine.
Another thing I noticed when removing the old coils was that when I loosened up the two bolts holding them in place the coils did not spring up. The new coils with the new springs and rods inside the boots had to be slightly compressed when installed so there is tension between the top of the spark plug and the rod. I wonder if some coil misfires could be due to weak springs not putting enough tension on the rod?
Something else I noticed but I might be getting a little **** about this was that the top of the plug where the rod rests is not made perfectly flat and some of the old rods were not made perfectly flat either. I was thinking about taking a fine file to the top of the plugs and sguaring them off. Maybe a little conductive paste between the rod and the top of the plug?
The old style distributer with spark plug wires had a lot more secure fitting where it clamped onto the top of the spark plug.
Awesome! I have since replaced my coils with the QYL (and new plugs NGK 6962), and that did indeed resolve the issue. They are well-made as you and the others stated in the reviews, and for the price, getting more than a year out of them will be fine :-)
Good ideas on the connections. I used a little dielectric grease but not much, as I wanted to be sure not to get it on the connection itself. It did not appear that any of the older coils had thrown spark to the cover, and they all had a little spring to them still.
My QYL coils did not come with the replacement paper gaskets, though I only had one coil with any under it to begin with. I did not see a good reason for them, so I installed them all gasketless.
Different engine but still coil on plug, I replaced my original ones on my ‘99 XJR with Chinese ones, (I purchased 16 as my brother has a NA 308 as well) these cost peanuts in comparison and have been going well for over 12 months. This is with a good number of trips well over 3000ks each and also some track time doing classic trials.
Could you just confirm the price of these coils?
Over here OE Lucas coils vary enormously; $270 for 6 up to a staggering $218 each from jaguarclassic!
Be careful of the coils sold in the UK as Lucas OE. Lucas as a manufacturer has not existed for a long time (were bought out by TRW and now part of ZF I believe). To my knowledge they do not manufacture anything with a Lucas brand.
The Lucas brand name is owned by a parts importer/distributor. So essentially they can put anything in a Lucas box and sell it on. So quite often retailers (unwittingly or not?) will sell those parts as OE. Aftermarket parts is such a minefield these days!
AFAIK in the UK the only source of real Made in Japan OE coils is SNG Barrat (for £77 each).
Well I just checked Amazon and the QYL coils are selling for $86.00 for a six pack. When I installed mine I did apply dielectric grease just to the inside of the rubber boot that goes over the spark plug so the coils would come off easier when changing the spark plugs. The grease is also to help prevent spark from going through the boot.
Last edited by Scotlad; Jan 28, 2019 at 04:11 PM.
Reason: more info
Just for reference here's a link to our 'Made In Japan' OEM coils. They are what Jaguar originally supplied, the newer Lucas etc are made by a different company than the original
Just for reference here's a link to our 'Made In Japan' OEM coils. They are what Jaguar originally supplied, the newer Lucas etc are made by a different company than the original
Thanks for that.
£77.70 each; what's wrong with the £30 ones?
It's been a few years since I had to buy X300 coils so things may have changed. But, at the time, the non-OEM type had a reputation for premature failure, lasting 6-12-18 months versus 8-10-12 years for the true OEM coils.
The true OEM type..the ones actually used by Jaguar.... were/are made by Diamond Manufacturing in Japan with a Lucas decal applied. Hard to find but, as you've seen, SNG has 'em.
As mentioned, the company now operating as Lucas isn't the same as the old Lucas we knew and loved. They're a label-engineering company. Some of their offerings might well be better than the old stuff but, in my experience, X300 ignition coils are not.
There was a long and detailed thread on X300 coils 3-4 years ago
QYL ignition coils
