How often do you guys replace plugs? I just went over 30k on my EVO and I've had it for a couple months. I notice it sometimes idles rough and sometimes turns over with some difficulty. Is this because it runs so rich? I figure plugs are a good place to start with trying to sort out what's going on. Also, do you reccommend a certain type/brand or just stick with OEM?

 

near stock stick with oem...30k will be my changing point unless I have an issue before that

 

I am at 45k and just changed my plugs again. But the first time I changed them was just to have some fresh ones for the tune. I just went with the factory NGK plugs ILFR7H if my memory serves me right. Might want to double check that though. I think it was about 25 a plug at the dealership.

 

every 30k and use OEM

 

Check your plug first before changing them. That also depends on your mod where you might need to change them sooner than 30k.

 

25 a plug wow, I know where not to go to get plugs!

 

i went a step colder with plugs - OEM replacement Denso IKH24s. it is gapped at 0.30 should i drop it to 0.25?

just a question lol.

 

NGK BPR9ES, I can get about 6-8000 miles on E85, I normally change them when I change my oil. At a 1.70 a plug, why not.

 

I'm looking for OEM-type plugs that are two steps colder than original equipment for my IX... what is the heat range for the factory IX plugs? Is it 7?

I found colder-range NGK BPR7EIX and BPR8EIX that are iridium plugs - only $8.48 each (plus shipping) at sparkplugs.com:

http://sparkplugs.com/results_cross....8EIX&x=51&y=14

Will the BPR8EIX work on my Evo IX for big boost (up to 30 psi on E85) like the NGK R7437-8 plugs that AMS wants $41.52 for EACH?

http://www.amsperformance.com/cart/N...mance.com.html

 

Also, does anyone have any experience with using both the NGK BPR8EIX, and the Denso IKH24, which is also a one-step-colder iridium plug? Which one works better?

The IKH24 and IKH27 (2 steps colder) are both $11.99 each at sparkplugs.com:

http://sparkplugs.com/results_cross....KH24&x=43&y=15

 

I run the IKH24 plug, 25psi 93 octane, been in the car for over a year. No issues.

 

Okay, thanks for the feedback. A set of Denso IKH24 ordered for mine!

 

cams, 680s, walbro, 24psi on 93 shell v-power.. running BPR7ES and change every oil change

 

54k and running the plugs the car came with. Runs fine. I figure they will go past 60k.

 

Is your car running stock boost? If not, you might want to consider changing them a little more frequently. My IX only has 20k miles on it and I'm changing mine now just as a preventative maintenance measure (E85, 27-32 psi).