Misfiring R33...help

[fletch63]

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 October 9, 2008 by fletch63

[l0WRB]

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.

[daxter]

When my R33 had a bad misfire, I installed a wasted-spark kit and BKR7E 0.8 plugs, can run 18psi all the way to redline and the car doesn't miss a beat. - This could be another option to fix your misfire

Edited October 9, 2008 by daxter

[abu]

Get some NGK Copper plugs, BCPR6ES come gapped at .8 already, then check all your coil packs

Sounds to me like one of the coil packs is on its way out

[bored33]

splitfire coilpacks / tune / plump back blow off valve

one of these should fix your problem

[and3_3]

How can one help prevent coil pack wear and tear? I understand that everything one day must die but are there ways to keep them good?

Atm i have the coil pack cover removed to keep them ventilated.

[The Dan]

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.

[fletch63]

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..............?????????????