I put in new BPR9ES plugs gapped to .022. When i rev to say 2.5k RPM and hold it, now it kinda has sort of a lope sound in it. Almost hesitant. I also threw a P300 random misfire once. It never used to do this before during slow revving. It was always smooth. Am i using the wrong gap? What else could it be?

My Mods:

Cos 272 Cams
Walbro 255
LICP
MBC @ 21PSI
O2 housing

 

what was wrong with the stock plugs?

 

24k miles. wanted to swap them. anyone have any idea? my friend is saying to re-gap.

 

Did you mistype or did you really go to colder plugs for no reason?

 

was told to get these plugs.

 

Thats a wrong plug! BPR9ES plug is for Evo 8 man!

 

Yes, you put wrong plugs in, those are for the 8 and are shorter plugs. Swap the stock ones back in or purchase some new plugs for the 9.

Stock heat range:
NGK - ILFR7H
Denso - IKH22

1 step colder:
Denso - IKH24

 

LOL. I thought I recognize that spark plug number to be for an Evo 8

 

yea i figured this out a few days ago. swapped them with the correct plugs and it is running great again. thanks!

 

by the way, i gapped them to .026 and my ride still kinda hesitates a little. a very minor bit. should i close the gap more?

 

I bought the IKH24s and the thread is a lot longer than the stock plugs. That a problem?

 

the threads are longer than the stock plugs or the plugs you have in there now (the wrong plugs)? The evo IX plugs have longer threads then the VIII plugs which is why they are not interchangeable.

 

Dude. You've been toldyou bought the wrong plugs. If you're not gonna take advice then don't ask for any!

 

Might want to actually read all the posts before you go blasting someone.

 

+1. BBS is tripping out *weirdo*

Service manual says IX plug gap should be .020 to .024 spec. I gapped my Denso IKH24 to .020.