Mis under load

[Race__24]

I went out for a spin last night, everything was running sweet for half an hour or so untill all of a sudden the car started missing under load, basically as soon as it makes more than 4psi. It was like someone flicked a switch!

I have read thousands of posts about plugs and coils but i'm not sure this is the same thing.

The car is a R33 Series 1. Stock except for:-

3 inch turbo back exhaust

K&N filter eliment

Boost solinoid set to permanent high boost

All mods have done over 20000KM

The problem

missing when under load/boosting more than 4psi(approx),

runs smooth off boost, even at higher revs as long as it's not boosting

Does a coil pack or plugs go off this quickly or should i be looking for something else. It was running fine, then three seconds later it was running like shit!

Any help very much appreciated

[cameron]

Start with the basic's, Pull the plugs out and check them or replace them and re-gapp them to .76

Then if that doesn't work try lowering the boost back to stock 7 psi.

What RPM does it starts to do it, also does it rev past the miss?

[Race__24]

will be pulling the plugs later today. i have platnums in there , if i think one could possibly be a little fowled i'll put a brand new set of coppers in.

the boost is standard, i have just hardwired the standard high/low solenoid.

as for the revs, it has an occasional mis around 3000 and it's really bad around 4000.

i tried driving through the miss but it is the same up higher

[Race__24]

ok, put new plugs in tonight, the missing isn't as bad now.

i think this could be due to me regapping the new plugs down to .8, the old ones were 1.1. So it looks like it was the coils after all.

I managed to pick up a bit more boost too, i must have sealed a leak when i was re-attaching everything.

Does anyone know where to get some spitfire coils in Australia at a reasonable price? I know there is a group buy but my car is a daily driver and i don't want to have to wait that long.

[Keeper]

how do you pin point which coil? how do you know if it is a coil?

i think this might be my prob too

[Sumo]

http://www.skylinesaustralia.com/forums/sh...70&goto=newpost

Check out this thread for coils.

[wishaw]

A friend of my had problems with the colis in his getz (not a skyline but still has spark plugs). They were leaking bad (big sparks from the coils at night). He took it to the dealer and they were able to read the voltage off each coil.

But if you want to replace one coil pack you might aswell do all of them otherwise the problem will repeat itself down the track.

So as sumo said check out that other thread