were they part# SP-515, they had some manufacturing defects so in 2017/2018 timeframe they came out with the new SP-546 which is improved. Possible it’s old stock or a bad run of plugs.
Cylinder 1 misfire
- Thread starter Dlsgap
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
Dlsgap
Member
The new one thst just broke today is a 546
Where did you buy it?
Dlsgap
Member
AutoZone... Trying a champion to see what happens
Champion has always had the one piece plug design but the prob you are having is not what was going on.
Franklin Jones
Well-Known Member
Can you stack an indexing ring or two around the threads and lift the plug out of the cylinder a bit?
Trainmaster
Old School Member
Could it be detonation? That will take out a plug electrode. Is it pinging or knocking? Sound like a can of marbles?
Dlsgap
Member
Nope... Slight valve noise that's been there forever... But not like a knock
Dlsgap
Member
So far the champion is performing well. Gonna take it out and check it after a few more days
That's kind of along the lines I was thinking but I don't know that they make indexing rings for this plug design currently. Maybe a standard 14 mm or whatever the thread size on this will work. I remember these being a 9/16 socket instead of a 5/8. So they're either a 12 or 14mm thread.
I'm thinking more about it, I guess a standard indexing ring for a tapered seat style plug should work just fine.
Similar threads
