I always had issues when I used any plugs other than Bosch Iridium or Platinum. You can even try Bosch copper plugs if you find the right heat and size. They're usually cheaper and better, but don't last very long... like 10k miles.
So the new set of plugs arrived, so switched out them along with new wires, since two broke during work (Magneti Marelli) and since I already tested and bought a new coil pack basically the whole ignition system's now revamped.
So far after more than two hours of driving, no problems, but Im really careful since I dont wan to find out Im wrong, but it feels ok.
The old plugs where NGK, and after pulling them, their resistance measured on average about 4 kohms.
I kept the previous set, which where Beru's and they measured ~1.4 kohms.
The new set is Bosch, and Im going to stay away from NGKs since I drive a little bit sporty, lasted less than two years, and (I think) 20'000 km.
Bosh Double Iridium is the best value. AC Delco as well as the NGK only have an iridium electrode. The Bosh plugs have iridium laser welded to the ground electrode as well. The advantage is that it stays cleaner when it gets up to temperature and will have virtually no wear. Don't get Autolite. Their plugs are almost always out of spec. Out of the box you can ohm them out and 1 of the 4 is guaranteed to be out of spec.
That is what I am running in this 1996 Corolla and my gas Mileage is better than ever! Made a huge difference in power .
For the last twenty or so years I have only used Bosch plugs. I have had great service in my VWs, Toyotas and Ford.
i bought ngk plugs and bosch platinum triple diode plugs and i got the coil pack off ebay.
I got misfires with FD5POR RS2 plugs. Almost 10000kms on Bosch f2cs this year. Been working perfect for me
Do not I repeat do not put Bosch plugs in any import. Don't know why but they always cause problems.
I then changed to a hotter plug the Bosch Platinum plugs and again gapped to .28. Once again the plugs fouled shortly after starting and driving for a few minutes.
Bosch finewires suck dong and AFAIK are not OE for anything even though they claim they're OE for practically every car on the road.
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