Spark plugs really matter?
#4
#5
#6
![Default](https://dodgeforum.com/forum/images/icons/icon1.gif)
Bosch +2 & +4 are a poor design, I would never install a set. Nothing wrong with the Bosch plats.
Most important thing, make sure the cap/rotor are fresh, wires are good, routed correctly and the plugs are indexed. Any plug Ive ever installed in my Indy, Ive always indexed them. I found both the NGK and Champion the idle was rougher than with either the Bosch plats or Autolite coppers.
I had Bosch Plats in my bone stock 5.9, with bolt ons only, no power adder when it ran a 13.99 et.(Oct/01). Autolite 3923 coppers for the 12.91 et.(0ct/05)
Without indexing the plugs, any comparisons are useless IMHO.
Most important thing, make sure the cap/rotor are fresh, wires are good, routed correctly and the plugs are indexed. Any plug Ive ever installed in my Indy, Ive always indexed them. I found both the NGK and Champion the idle was rougher than with either the Bosch plats or Autolite coppers.
I had Bosch Plats in my bone stock 5.9, with bolt ons only, no power adder when it ran a 13.99 et.(Oct/01). Autolite 3923 coppers for the 12.91 et.(0ct/05)
Without indexing the plugs, any comparisons are useless IMHO.
#7
![Default](https://dodgeforum.com/forum/images/icons/icon1.gif)
So, yes, really Champion.
![Big Grin](https://dodgeforum.com/forum/images/smilies/biggrin.gif)
Trending Topics
#8
![Default](https://dodgeforum.com/forum/images/icons/icon1.gif)
Another vote for Champion, and another agreement that the lawnmower argument is lame. These trucks came stock with Champions.
#9
#10
![Default](https://dodgeforum.com/forum/images/icons/icon1.gif)
Another +1 for the Champion recommendation. Not only do I recommend the Champion plugs, I suggest using the exact stocker plug that came in the vehicle from the factory. The list of reasons why for this is long but the simplest of them is that the manufacturer did truly do all engine testing using the stock plug equipped from the factory.
On my Gen 1 Durango, 4.7L, I was in a pinch a few months back, wanting to change the plugs before a long road trip. All I could get on the quick was Autolite plugs. The D was fine on the highweay but idled a bit rougher on the Autolites. Noticed about a 0.3 mpg reduction as well. Swapped out to the stock Champions about a month ago and she runs like a champ again at 120,000 miles!
On my Gen 1 Durango, 4.7L, I was in a pinch a few months back, wanting to change the plugs before a long road trip. All I could get on the quick was Autolite plugs. The D was fine on the highweay but idled a bit rougher on the Autolites. Noticed about a 0.3 mpg reduction as well. Swapped out to the stock Champions about a month ago and she runs like a champ again at 120,000 miles!