Double platinum vs irridium spark plugs
- Thread starter Wardonkey
- Start date
They might not last as long as iridium. Long life is the main reason for iridium. The price difference isn't much between the two 
The only difference might be the longevity of the plug. Performance wise, no difference.
It will work just fine. Double platinum plugs are quite good and are generally 100,000 mile plugs.
Not unless it is worn. As noted above the difference is longevity.
Besides, pre-ignition knock is caused by lots of things including the octane rating itself - which you have changed pretty radically. I'm not even sure how the spark plug would cause knock as it isn't firing early.
Understand. It would bug me but really not worth changing them back. The Bittog itch is hard to suppress!
LOL...I totally get that itch. But yeah...I'll leave them alone. Sounds like it's creating no issues. When I first became a member here I had PTSD every time I looked at oil jugs on the shelf as I couldn't make up mind what to use. I finally grew out of that years ago. Easier to do when you realize your car will likely outlive you. LOL
So, I had the platinums swapped out for irridium plugs. Thought I'd give it a go with 87 octane. Spark knock is terrible. Back to 93. There is enough residual 87 I got sick of it and put some STP octane boost in. This car can run E85 but not a fan of that in cooler temps. I don't know what the heck could be causing this. It has 87k on the odometer. I've owned it since 34k. It knocked then on 87 so I've always just ran 93 octane until the plugs were changed. New irridums, makes so difference. I'm thinking I just have to live with it? One could spend a small fortune trying to figure what's causing the Spark knock.
Is a 14 year old car with 82k miles considered low mileage? How is the car driven? Short trips?
Is it a V8? Maybe the EGR system might be partially plugged?
Is it a V8? Maybe the EGR system might be partially plugged?
"spark knock" is caused by too-advanced ignition timing. Plugs have nothing to do with causing that (besides the stupid-obvious
).If your combustion chamber is carboned up, that can cause knock. Check your compression in each cylinder.
So i cleaned the combustion chamber and the freaking thing still knocks on 87 octane. I give up. It's either a timing issue and I'm not about to replace the timing chain. Or its bad knock sensors. But the engine hasn't thrown any codes. No check engine light. No nothing. Any thoughts? Just live with it? Seems to be what it is.
Why don't you try retarding the spark?!
