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Hi all, I was wondering if anyone can help me.

I have an r33 GTS-T. Mods are FMIC, Pod, 3" Cat Back, 11.5lb boost, fuel pump, HKS BOV.

It started to have the slightest miss occasionally on idle and if you just feathered the accelerator it missed slightly for just a second as the revs built.

I then swapped my iridiums for copper heat range 6 gap set to .7. (to get over my "blowing out the spark" problem)

Now the idle miss is much worse than before especially when cold.

It also extends much further into the rev range.

At high revs or high load it is fine. It screams to redline smooth as.

I have tried everything other than changing plugs.

I was thinking to change gap to .8, next to change heat range to 5.

Any ideas would be greatly appreciated as it is very annoying.

Cheers.

Edited by fletch63
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https://www.sau.com.au/forums/topic/239572-misfiring-r33help/
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get yourself some splitfire coilpacks for starters.

and get yourself some heat range 7 gapped to .8

think there BK7RE? there the best plugs 2 use...

my 2 cents... lower ya gap ya plugs the worse your miss fire is gonna be on idle, mine use to do the same wen i used band aid fixes.

Try having your injectors cleaned. THIS IS NOT A COILPACK OR SPARK PLUG FAULT

Your coilpack would have to be pretty fubar to miss at idle.

I agree. I changed gap on my coppers from 0.7 to 0.8 and it is ten times better. Just a little bad on cold start. I am now lookn at IAC or AAC valves. What do you think.

I have previously tried 2 diff types of injector cleaner Wynns etc..............?????????????

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