Hard Starting, rough idle and Wet Plugs??

[GodziRRa]

Hi Guys!
My GT-R is having a starting problem. It would take me to crank the engine twice for it start, but it would start one click if you help it via stepping the gas pedal. And the car stumbles at idle, like it's misfiring. Me and my lads took the plugs to check, one plug is wet. We cleaned it, start again all is well. But after a few rounds of driving, it starts all over again...rough idle and wet plug.

What do you think is my problem... is it the s. plug or the coil packs. By the way coil pack is split fire d.i, and I've heard of it having some issues as well. Any inputs?

[GTS4-R]

check your coolant temp sensor to ecu

[rolyaT]

^ second that. Mines acting up on startup and my wires to my temp sensor have gone to crap. Luckily I got a spare to put in over winter

[xcye]

Could be the one injector is leaking fuel into the cylinder.

[GodziRRa]

Replaced the plugs and it started ok. But now after a few days it's starting all over again. I'll plug in my consult later to check the coolant temp signal.

Could be the one injector is leaking fuel into the cylinder.

What's the sign of this mate?

[GodziRRa]

Well, consult says no error.

[DarkCaporaL]

You already know the issue is coming from that cylinder/plug.

I'd start with the basics, meaning it's either getting overfueled which causes it to foul (leaky injector) or it lacks spark and beomes fouled (could be the coilpack, the plug itself, wiring, etc).

[GodziRRa]

Well just found out that the wet plugs has nothing to do w/ it. Changed to new plugs and it's not wet anymore and idles fine. But unfortunately the cold start problem still persists, still have to do the magic pedal press a bit.