Dodgy Coilpacks?

[MAT00]

Hey everyone!!

My brothers R34Gt-t is misfiring when ever you put the foot down a bit. Its fine when hes driving soft, but misfires bad when he tries to go hard. We've already changed the spark plugs and think now that it may be the coilpacks???

Any ideas???

(i did search but didn't find much...)

Thanks

[willL]

get a set of splitfires.....seen this problem in many threads as well as on my car

Edited April 19, 2009 by willL

[Proximity Motorsport]

befor u go and pay $500-$600 for coilpacks, get some heat temp proof silicone and fill in the gaps on your coilpacks so it cant earth out on head instead of on plug. Search coilpack budget mods, you might find pictures.

[Turbotonic]

hey mate use this from bunnings warehouse cost $11 worked for me Shelleys Industrial Grade Silicon Sealer 401

[chuckie]

Hey everyone!!

My brothers R34Gt-t is misfiring when ever you put the foot down a bit. Its fine when hes driving soft, but misfires bad when he tries to go hard. We've already changed the spark plugs and think now that it may be the coilpacks???

Any ideas???

(i did search but didn't find much...)

Thanks

Hi MATthere is lot`s on this may be you didn`t have much Searchluck it is hard some time`s ,better luck next time,cheer`s chuckie .

[bubba]

Before you bother doing ANYTHING to fix the problem, swap the coils around to figure out which one is the problem. It could be a coil OR the harness, swapping them about should help diagnose which it is.

[MAT00]

Sweet, thanks for the replies. Will try swapping them first them mayb try the silicon.

[Silvia GTR]

I've got 5 working GTT coilpacks if you need one!

[Checkbuzz]

What gap are the new plugs he's using? and what boost is being run?

The issue sounds like coil packs (very common at higher boost levels) but the problem often can be reduced or eliminated by using plugs with a smaller 0.8mm gap (or less depending on boost) as opposed to the std 1.1mm gap.

This worked for me and the insulation of the coil packs didn't, I still have a slight miss and are currently waiting for JJR coils to be back in stock for the R33 S2.

Also Splitfires are great but they are $600+, Super Sparks can be had for $500, JJR have coil packs for $400 (1yr warranty) that do the same job and there are some Yellow Jackets just come on the market for $350 a set (6 month warranty). For my money I'm going for the JJRs - same warranty and result as Splitfires.

[HEKT1K]

does it hesitate coming onto boost? i had a similar issue, also had a dodgy idle, turned out to just be a vac leak. pulled out my coils and they looked brand new!! so just be sure to check everything before spending a few hundred on coils

[d_liberate]

What gap are the new plugs he's using? and what boost is being run?

The issue sounds like coil packs (very common at higher boost levels) but the problem often can be reduced or eliminated by using plugs with a smaller 0.8mm gap (or less depending on boost) as opposed to the std 1.1mm gap.

This worked for me and the insulation of the coil packs didn't, I still have a slight miss and are currently waiting for JJR coils to be back in stock for the R33 S2.

Also Splitfires are great but they are $600+, Super Sparks can be had for $500, JJR have coil packs for $400 (1yr warranty) that do the same job and there are some Yellow Jackets just come on the market for $350 a set (6 month warranty). For my money I'm going for the JJRs - same warranty and result as Splitfires.

Ive had a set of yellow jackets in my GTST for around 3 months now and they have never missed a beat. They actually come with a 12 month warranty too. Theres a group buy for them here on SAU and they are only $320. So cheaper than JJR, same results as Splitfire and same waranty.

[Ehgriez]

Ive got JJR's in mine, never had a problem in the 4 months or so ive had them

[Darius]

Try coating the coils as already mentioned and see how that works.

Splitfires aren't worth the money unless you aren't very mechanically inclined and/or you want a COP setup like stock. I am in the process of swapping my old coils since the epoxy didn't help in the high rpms. I picked up a set of 8 Chevy Corvette LS2 coils for $125USD and mounted them along the firewall with separate spark plug wires. They should blast the splitfires away and provide adequate spark for whatever I throw at them. Plus they have built in ignitors so I can get rid of my RB25 Series 1 ignitor/power transistor unit (PTU) and wire them directly from the ECU.

[GT-RZ]

Only problem i'v ever had with coils is when one died. Not sure any of the aftermarket ones can offer a much if any greater spark unless you introduce leads in to the equation like above...

before anything, like said before, clean out around the spark plug hole and clean the sleeves then spray it all with silicon spray and i can't see why unless a jacket is damaged you would have problems given that there is not a fault in the coil or wiring itself...