420A Recommended Spark Plugs?

[onlytsuki]

Hello,
So I guess my plugs fouled and are throwing a P0300 code. Initially I was using Bosch Iridium Plugs but I guess that ain't the move.
What plugs should I run on my 420A non-turbo? If also possible, part numbers?

Also I did see from the owners manual that it recommends I run with Champions Part #426 copper plugs?
Thoughts?

Thanks

 

[steve]

My 98 FSM says Champion RC9YC5 gapped 0.048-0.053 in. torqued to 20ft. lbs. for the 420A

 

[BLACK'98DSM]

Ultimately you'll find that none of the brands or materials make a huge difference. Some will improve longevity, but there are no other aspects that you can feel.

Even though Champion plugs are recommended, I always ran NGK copper plugs. It was simply an act of personal preference.

If you're fouling plugs, there may be another issue that you need to diagnose.

 

[3Starsearch]

Ultimately you'll find that none of the brands or materials make a huge difference. Some will improve longevity, but there are no other aspects that you can feel.

Even though Champion plugs are recommended, I always ran NGK copper plugs. It was simply an act of personal preference.

If you're fouling plugs, there may be another issue that you need to diagnose.

Would you recommend Denso Iridium Power Spark Plug 5304. Ive been running NGK BKREIX 6418 and only recently I got a check engine light for P0351. I would get misfires sometimes and smell unburned fuel. I changed coil pack (Blue Streak) and coil plugs (import direct) and still get the same code. Also changed both cam and crank sensors still no luck unfortunately.