My Evo 9 Misfiring. sounding like it has cams.

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Sep 9, 2014 | 09:44 AM

#16

evole97

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From: califorina

Quote:

Originally Posted by Ev0ikon

Gap them down to 0.020". Don't be lazy. LOL@Pre-gap!

okay will do

Sep 11, 2014 | 10:00 AM

#17

boostless

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From: SoCal - Where pimpin aint easy

Quote:

Originally Posted by Ev0ikon

Gap them down to 0.020". Don't be lazy. LOL@Pre-gap!

I don't understand this comment. Stock replacement NGK iridiums don't need to be gapped. They are pre-gapped. You're potentially adding another issue that wasn't there to begin with.

Sep 11, 2014 | 10:18 AM

#18

Ev0ikon

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From: 3rd Rock {from = sun}

Quote:

Originally Posted by boostless

I don't understand this comment. Stock replacement NGK iridiums don't need to be gapped. They are pre-gapped. You're potentially adding another issue that wasn't there to begin with.

Factory gaps on those are about 0.024" - 0.026". In my experience they are just large enough gap to cause misfire if you are boosting over stock boost level and at higher RPM.

Sep 11, 2014 | 10:20 AM

#19

evole97

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From: califorina

Quote:

Originally Posted by Ev0ikon

Factory gaps on those are about 0.024" - 0.026". In my experience they are just large enough gap to cause misfire if you are boosting over stock boost level and at higher RPM.

Soooo should i re gap orrr? i always thought the are pre gapped

Sep 11, 2014 | 10:23 AM

#20

SilverShadow03

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From: NorCal

^You can gap the stock iridiums CAREFULLY....

https://www.evolutionm.net/forums/ev...ug-gaping.html

Carefully check the gap without removing the sliver of iridium.