RB25DET misfire under load/boost

[BASHERnissan]

I recently bought an R33 gtst with series 2 RB25DET. I turned the boost down on my manual boost controller when I gave it an oil change now whenever It hits boost or even half throttle it will misfire and WON'T STOP at all... Check engine came on after oil change

Has link g4 440 injectors bigger turbo 42mm wastgate and straight pipe... Tuned to 240kw on 15 psi

Changing coil packs and sparks this week.. any help appreciated thanks 

 

 

[BASHERnissan]

(won't stop all the way through rev range)

 

[Dose Pipe Sutututu]

What colour are your coil packs? Red or Orange or Yellow? Or Black or Blue?

[BASHERnissan]

Red mate !

 

[Dose Pipe Sutututu]

Pop some Splitfires in or R35 or 370Z coilpacks and I'm quite confident your problems will go away, note the last 2x options will require a new bracket and wiring loom.

[GTSBoy]

Red's dead baby. Red's dead.

[BASHERnissan]

Cheers mate, if not coil packs and sparks what is your next guess ? I'm new to rb's lol so thanks heaps

 

[BASHERnissan]

Just now, GTSBoy said:

Red's dead baby. Red's dead.

Must be time for some newies. Any suggestions

[BASHERnissan]

Split fires are so expensive wow

 

[GTSBoy]

Splitfires are not expensive now. They are the same price as they have ever been, possibly cheaper in real terms. They are still the cheapest & easiest way to do a coil upgrade.

They are, however, not really any different in terms of performance & quality than the original Nissan ones, which have been popping up here and there over the last few years. The problem with buying "OEM" ones is that they are probably easier to counterfeit.

The smart approach these days is to replace with a modern pencil coil. Your choices are to buy a kit that uses Toyota/Denso coils (such as Yaris, or any of the 1ZZ tyes) and necessary wiring adaptation & mounting bracket, or to buy Nissan type (R35 GTR, VQ370 types) and the necessary stalk adapters and mounting plate. The Toyota options are cheaper as kits. The easiest/best Nissan options will cost you over $1k, but are the absolutely f**king duck's nuts in terms of performance capability, for a coil that can fit in the factory spot.

Edited May 21, 2019 by GTSBoy

[niZmO_Man]

2 hours ago, BASHERnissan said:

Split fires are so expensive wow

 

Not really, $600-odd for bolt in is good. When you compare it to cheapo red/yellow ones, yes, but they're on par with OEM and cheaper than the R35 route.

 

In the mean time, gap your spark plugs to 0.7mm and see if that makes a difference.

[BASHERnissan]

Cheers for the help everyone... Now it won't even IDLE properly?!?!

Does anybody have a clue what going on.

 

[tridentt150v]

Dead coil packs affect the whole range....not just higher up.  Red is dead, Blue is true.

If you don't believe us, take the coils and get them tested.

Otherwise take it to a workshop and get their input.

[Dose Pipe Sutututu]

23 hours ago, BASHERnissan said:

Does anybody have a clue what going on.

Yeah, your coilpacks belong in the bin (bluntly putting it).