Misfiring at 4000rpm

[ZigenGT]

Hi I recently upboosted my skyline to 10 pounds & started to encounter misfiring at about 4 to 5000 rpm. I thought it was problems with the spark plugs so i changed them to stock ones (1.1. gap), however the misfiring still occurs

Can someone pls advise me, my mods are turboback 3" exhaust & air filter...

Thanks!

[ZigenGT]

damn.... just did a search & realized it might be the coil packs... looks like some araldite or silicone might be need to repair them, does anyone know where i can buy these? Cheers

[benl1981]

Hey Zigen. I'm having some problems to. Though now it's happening at stock boost levels sometimes aswell.

Fitted new plugs 0.8mm gap. I think my coil packs are stuffed, they have burn marks on the side where the spark may have been escaping. Uping the boost puts more demand on the coil packs.

There are post here about aralditing up the coil packs. This may not be your problem but it seems a lot of people have had coil pack related problems.

I'll let you know how I go with mine.

[esprit]

Indeed it seems a lot of people are having issues with coil packs. The guy I'm buying my new car from says he just sold another R32 which needed some coil packs replaced and my new car I'm buying he says will need a few replaced which he is taking care of.

Is there some way of preventing this stuff happening cause it seems to happen a lot?

[Redback]

disconneted your battery. turn your ignition on and go mad on anythign that takes power... usually hold the brake on for a while... this will drain the comp of all power and reset it.

had the same problem today actually in a 33... not mine.... and it was fixed and it was running stock gaps and stock boost... reseting the comp seemed to fix it.. give it a go... 5 min fix.... hopefully

[Mintie]

gap the spark plug to 0.8 or even 0.6 ...check for crack on the inside ruber of the coil pack...

tape it up with tape and it shout work ok....save you money

[Ionos]

Instead of taping my coil packs, I gave the metal bracket a couple of coats of epoxy paint to act as an insulator, so a) it didn't earth very well with the rest of the engine, and B) to stop the spark from jumping to there.

But I dont think any of my coils were leaking in the first place, it was more a precautionary measure since I was changing the plugs anyhow.

[ecl]

yeah, i have same problem now but i havent had time to regap the plugs yet

if it doesnt work, its probably the coils

resetting the ECU is a temp fix which lasts 1-2 days

cheers

[toby19]

ZigenGT before you spend money on something that may turn out to be a non-issue, I would suggest that you re-gap your plugs to between 0.7 and 0.8 mm. This is definitely needed for any moderate tune-up of your RB25. It only takes approx 1/2 hour of your time.

[ZigenGT]

Thanks for the advice guys, this sounds like a silly question but how do i gap the spark plugs to 0.8? I know my mechanic has an instrument which does it but how do i do it on my own? Where can i buy such an instrument? Thanks!!

[Ionos]

You need a feeler gauge, only costs abuot $10 or so from any auto store.

It's basically a clip with a whole bunch of different thickness pieces of metal, that you can use to check the gap of the plug. To lower the gap, lock the plug in a vice and tap the top very lightly with a hammer.