R34 Gtt- High Boost Misfire

[CAE]

Hi Everyone. Hello from Mauritius.

I have a r34 gtt with the following mods:

POD, 3 inch cat back exhaust, (stock boost)

Its currently developed a misfire problem at high boost around 5000 rpm onwards. Seems something like fuel cut but its not like hitting a brick wall and u can put ur foot down through it.

I changed the plugs and gapped them to .8mm and its still misfires.

I also disconnected the factory solenoid and connected the wastegate actuator to the compressor and this lowered the boost. The misfire went away for a while but it ocassionally does it but its not as consistent as before.

Im thinking its the coil packs but not certain. Are the coil packs a common problem on the 34's. The vehicle has done 75000k's. It could also be the injectors. I'll check my fuel pressures tommorow. Can anyone tell me how many kpa it should be with the vac hose connected, without and also the flow rates?

Also what should the resistance of the injectors be and is there a way to test the coil packs. Im guessing it might be within specs cos it doesnt miss on low boost.

One last thing, what are the common problems associated with R34's and has anyone had a similar problem like mine on the same vehicle.

Thanks in advance guys. Would really mean a lot if someone could help me out here.

[walkoau]

Hi Everyone. Hello from Mauritius.

I have a r34 gtt with the following mods:

POD, 3 inch cat back exhaust, (stock boost)

Its currently developed a misfire problem at high boost around 5000 rpm onwards. Seems something like fuel cut but its not like hitting a brick wall and u can put ur foot down through it.

I changed the plugs and gapped them to .8mm and its still misfires.

I also disconnected the factory solenoid and connected the wastegate actuator to the compressor and this lowered the boost. The misfire went away for a while but it ocassionally does it but its not as consistent as before.

Im thinking its the coil packs but not certain. Are the coil packs a common problem on the 34's. The vehicle has done 75000k's. It could also be the injectors. I'll check my fuel pressures tommorow. Can anyone tell me how many kpa it should be with the vac hose connected, without and also the flow rates?

Also what should the resistance of the injectors be and is there a way to test the coil packs. Im guessing it might be within specs cos it doesnt miss on low boost.

One last thing, what are the common problems associated with R34's and has anyone had a similar problem like mine on the same vehicle.

Thanks in advance guys. Would really mean a lot if someone could help me out here.

sounds like plugs but could also be coil packs failing(one at least), wont be a fuel problem but if you want to check anyway your fuel pressure should be 36psi with vac connected and 42psi with vac disconnected off fpr. coil packs resistance is about 8 ohms if i remember correctly but dont hold me to that figure.

i have had the exact same problem lots of times and it is always plugs or water around the plugs(i have a vented bonnet and the cover isnt over the plugs).

thanks

Justin