Unusual problem with RB silvia

[SUS55]

I have a weird problem in my RB silvia and am really stuck for ideas for what it could be!!

When the car is cold, and only running for about 5 minutes, it pulls hard and has NO problems whatsoever... But after 5-10 minutes when shes nice and warm, she starts coughing when coming onto boost and backfiring and yeah, not a happy engine...

My thoughts are its an ignition problem? spark plugs/coilpacks etc? so i replaced my plugs with new iridiums, gapped them and shes still doing it... So my next guess is coilpacks, they are 2nd hand coilpacks that are in there at the moment because they had to be replaced as the last ones ummm, melted.

I NEED HELP, ANY RB EXPERTS?

[Wazz]

soooooooo its not up to normal operating temp when your taking it onto boost? if so..treat the car with some respect.. let the car warm up for 5 or 10 minutes or drive it very easy untill is warm.. before even think about hitting boost.. thats how you can break shit.. also could be a coil pack.. so yer if the last ones melted.. WTF are you doin to the car i've had my rb sil for a while now.. had no problems with it so yer

[aKTiVE]

i had that problem, and it was my CAS (crank angle sensor)

[SUS55]

mmm, any more tips? still trying to work it out

[Morgs]

Fuel pump

[jazza08]

injectors

Had the same problem and it was a coil pack, but if uve checked that then eh.. clean ur fuel system out and check ur plugs constantly.

[SUS55]

mm ok cheers, ill try all of the above asap!

its got a 600hp fuel pump, could it still be the problem?

and someone told me to do diagnostic checks on my ecu, but i got a mines in it, so yer, cant...

[SUS55]

fixed, all it was, was dodgey wiring to the afm, how gay...

[Fidel04]

yeh i was gonna say check ya afm